Disaster Medicine and Mass Casualty ICU

Clinical Overview

Disaster medicine encompasses the medical response to events that overwhelm local healthcare capacity, requiring extraordinary resource allocation, triage, and ethical decision-making. Mass casualty incidents (MCIs) challenge intensive care units to deliver care under crisis standards, balancing individual patient needs against population health imperatives.

Key Principles:

Disaster Definition: Event exceeding community healthcare resources, requiring external assistance and altered standards of care
ICU Surge Capacity: Ability to rapidly expand critical care services through space, staff, supplies, and systems (4S framework)
Triage Under Scarcity: Ethical frameworks for allocating limited life-sustaining interventions
Crisis Standards of Care: Shift from usual care to functionally equivalent care to care adapted to disaster context
Resilience and Recovery: Systems to support responders and communities post-disaster

Disasters disproportionately affect vulnerable populations including Indigenous communities, elderly, disabled, and socioeconomically disadvantaged groups. Australian and New Zealand disaster planning must address bushfires, cyclones, earthquakes, volcanic eruptions, flooding, and pandemic threats with culturally safe, equity-focused responses.

Disaster Definitions and Classification

Disaster Typology

Natural Disasters:

Meteorological: Cyclones, tornadoes, severe storms
Hydrological: Floods, tsunamis
Geophysical: Earthquakes, volcanic eruptions, landslides
Climatological: Bushfires, drought, heatwaves
Biological: Pandemics, epidemics

Man-Made Disasters:

Technological: Chemical spills, radiation incidents, building collapse
Intentional: Terrorism, mass shootings, explosions, biological/chemical attacks
Transport: Aviation, rail, maritime disasters

The distinction affects response planning: natural disasters typically allow some warning and geographic prediction, while man-made disasters may be sudden, involve criminal investigation, and require security coordination. [1]

Mass Casualty Incident (MCI) Criteria

Operational Definitions:

Multiple Casualty Incident: Event producing victims manageable within existing resources
Mass Casualty Incident: Victims exceed immediately available resources, requiring altered triage and resource allocation
Catastrophic Disaster: Complete destruction of healthcare infrastructure, requiring sustained external support

MCI thresholds vary by institutional capacity. A typical Australian tertiary ICU (20-30 beds) may define MCI as >5-10 simultaneous critical casualties requiring mechanical ventilation. [2,3]

Australian and New Zealand Disaster Context

Australian Disasters (1990-2025):

Black Saturday Bushfires (2009): 173 deaths, 414 injuries, 2,029 homes destroyed; ICU surge for burns (30-80% TBSA), inhalation injury, carbon monoxide poisoning [4]
Queensland Floods (2010-2011): 35 deaths, widespread infrastructure damage, prolonged ICU surge
Christchurch Earthquake (2011, NZ): 185 deaths, 6,000+ injuries, hospital evacuations, international medical assistance
Cyclone Yasi (2011): Category 5, hospital evacuations, 670,000 without power
COVID-19 Pandemic (2020-2023): Sustained ICU surge, crisis capacity planning, ventilator allocation protocols, healthcare worker burnout [5,6]
Whakaari/White Island Volcanic Eruption (2019, NZ): 22 deaths, 25 severely burned patients requiring international retrieval and distributed ICU care [7]
Black Summer Bushfires (2019-2020): 34 deaths, 3,000+ homes destroyed, air quality crises in major cities

Indigenous Community Vulnerabilities:

Aboriginal and Torres Strait Islander communities and Māori populations face disproportionate disaster impacts due to:

Remote geographic locations with limited infrastructure
Pre-existing health disparities (chronic disease burden, lower life expectancy)
Housing quality and overcrowding
Socioeconomic disadvantage limiting disaster preparedness
Cultural connection to land (displacement causes spiritual harm)
Language barriers in emergency communication
Historical trauma reducing trust in government response [8,9]

Culturally safe disaster planning requires Indigenous community leadership, culturally appropriate communication (Aboriginal Health Workers, Māori Health Workers), recognition of cultural priorities (protecting sacred sites, returning to Country/whenua), and addressing systemic inequities. [10]

Mass Casualty Triage Principles

Triage Philosophy in Disasters

Usual Care Triage: Treat sickest first, unlimited resources assumption Disaster Triage: Maximize survivors, allocate resources to those most likely to benefit, accept difficult choices [11]

Ethical Tension: Individual duty of care vs. population health obligation

START Triage (Simple Triage And Rapid Treatment)

Adult MCI Triage (Field Use):

Developed for prehospital use, 30-60 seconds per patient. [12]

Algorithm:

Can the patient walk? → YES = Green (Minor/Delayed)
Is the patient breathing? → NO (after airway positioning) = Black (Deceased/Expectant)
Respiratory rate: >30/min = Red (Immediate)
Perfusion: Capillary refill >2 seconds or absent radial pulse = Red (Immediate)
Mental status: Unable to follow simple commands = Red (Immediate)
All others: Yellow (Delayed)

Categories:

Red (Immediate): Life-threatening injuries, high survival probability with rapid intervention
Yellow (Delayed): Serious injuries, stable for 2-4 hours
Green (Minor): Walking wounded, stable for 6-24 hours
Black (Expectant/Deceased): Dead or injuries incompatible with survival given resource constraints

Limitations: Does not account for age, comorbidities, or ICU resource requirements; static assessment without reassessment protocols. [13]

JumpSTART Triage (Pediatric Modification)

Pediatric-Specific Considerations:

Children have different physiological responses (compensate until sudden decompensation), higher respiratory rates, and different mental status assessment. [14]

Algorithm Modifications:

Able to walk? → YES = Green
Breathing? → NO → Give 5 rescue breaths → Breathing resumes = Red; No breathing = Black
Respiratory rate: <15 or >45/min = Red (ages <1 year modified to <20 or >50)
Perfusion: Absent palpable pulse = Red
Mental status: AVPU assessment - Unresponsive or responds only to Pain = Red

Rationale for Rescue Breaths: Children often have primary respiratory arrest (foreign body, laryngospasm); 5 breaths may reverse arrest, avoiding preventable death. [15]

SALT Triage (Sort, Assess, Lifesaving Interventions, Treatment/Transport)

Two-Step Process:

Step 1 - Global Sorting:

Voice command: "If you can walk, move to [area]" → Green
Assess remaining patients for spontaneous movement, purposeful movement, response to commands

Step 2 - Individual Assessment:

Assess in priority order (still → waving/purposeful movement → walking):

Lifesaving interventions (LSI): Control major hemorrhage, open airway (basic maneuvers only)
Dead/Expectant: Apneic despite airway maneuvers, no peripheral pulse with uncontrolled bleeding
Immediate: Obeys commands OR doesn't obey commands BUT has peripheral pulse AND respirations
Delayed: Minor injuries only
Minimal: Green (walking wounded)

SALT incorporates limited lifesaving interventions (tourniquets, airway positioning) into triage, recognizing that 30 seconds of hemorrhage control may prevent preventable death. Endorsed by American College of Surgeons and CDC. [16,17]

ICU-Specific Triage Considerations

Field triage determines hospital destination; ICU triage determines allocation of ventilators, ECMO, vasoactive drugs, RRT, and ICU beds. [18]

ICU Triage Principles:

Likelihood of Benefit: Prioritize patients with high probability of ICU survival
Life-Years Saved: Consider expected post-ICU survival and quality of life
Resource Duration: Favor patients requiring shorter ICU stays if resource scarcity extreme
Reassessment: Daily evaluation for ongoing appropriateness of ICU resources

Prognostic Scoring:

SOFA Score (Sequential Organ Failure Assessment): Mortality prediction, used in some allocation protocols [19]
APACHE II/III: Severity of illness scoring, resource intensity prediction [20]
Limitations: Scores developed for populations, not individuals; discrimination imperfect; risk of bias against elderly, disabled, chronically ill [21]

Exclusion Criteria Controversy: Some protocols exclude patients with severe baseline disability, terminal illness (life expectancy <1 year), or advanced dementia. This raises profound ethical concerns about discrimination and value judgments. [22,23]

Surge Capacity Planning: The 4S Framework

Surge capacity requires expansion across four domains: Space, Staff, Supplies, and Systems. [24,25]

Space

Conventional Capacity: Usual ICU beds with standard equipment Contingency Capacity: Repurpose step-down units, PACU, cardiac cath labs, endoscopy suites Crisis Capacity: Non-clinical spaces (conference rooms, cafeterias, parking garages with tents)

Australian Context:

ICU bed capacity: ~2,200 ICU beds nationally (8.9 per 100,000 population) pre-pandemic [26]
COVID-19 peak planning: Expansion to ~7,000 beds (ventilator capacity, space, staffing) [27]
Geographic maldistribution: Metropolitan centers vs. rural/remote areas

Space Considerations:

Oxygen, suction, compressed air infrastructure
Electrical capacity (ventilators, infusion pumps, monitoring)
Negative pressure rooms (airborne infection)
Physical layout for line-of-sight nursing
Isolation capacity for contaminated patients

Staff

Most Constrained Resource: ICU nursing, respiratory therapists, intensivists. [28]

Conventional Staffing: 1 nurse : 1 patient (ICU standard) Contingency Staffing: 1 nurse : 2-3 patients with support staff Crisis Staffing: 1 nurse : 4+ patients, non-ICU nurses with just-in-time training, advanced practice providers

Workforce Expansion Strategies:

Redeployment: Anesthesia, ED, surgical ICU nurses to medical ICU
Retired Clinicians: Call-back of recently retired staff
Tiered Supervision: Experienced ICU nurse supervises multiple less-experienced nurses
Task Reassignment: Medical students, non-clinical volunteers for non-nursing tasks
Interstate/International Assistance: Medical Assistance Teams (MATs), AUSMAT, NZMAT

Staff Wellbeing: 12-hour shifts maximum, mandatory rest periods, psychological support, childcare assistance, accommodation. Healthcare worker burnout, moral injury, and PTSD are significant concerns. [29,30]

Supplies

Critical Consumables:

Ventilators: Australia had ~2,200 ICU ventilators pre-pandemic; surge procurement added ~7,500 devices [31]
Sedatives/Analgesics: Propofol, midazolam, fentanyl, ketamine (drug shortages during COVID-19)
Vasoactive Drugs: Norepinephrine, vasopressin, epinephrine
Oxygen: Piped supply vs. cylinder capacity, oxygen saturation during surge demand
PPE: N95/P2 respirators, gowns, gloves, face shields (pandemic stockpiles)

Supply Chain Resilience:

Strategic National Medical Stockpile (Australia), National Reserve Supply (NZ)
Just-in-time inventory model vulnerability
International supply competition during global disasters (COVID-19 PPE shortages)
Ethical allocation when supplies exhausted (e.g., reuse single-use devices, crisis protocols)

Ventilator Allocation: Protocols for allocation, reallocation, and withdrawal of mechanical ventilation during extreme scarcity. [32,33]

Systems

Communication Systems:

Hospital Incident Management System (HIMS): Structured command-and-control for hospital disaster response
MIMMS (Major Incident Medical Management and Support): International framework for MCI response (Command, Safety, Communication, Assessment, Triage, Treatment, Transport) [34]
CSCATTT: Mnemonic for disaster scene organization (Command, Safety, Communication, Assessment, Triage, Treatment, Transport) [35]
Interoperability: Radio, satellite phone, redundant IT systems when infrastructure damaged

Coordination:

State Emergency Services (SES), Ambulance, Fire, Police
Australian Health Protection Principal Committee (AHPPC), National Incident Room
Pacific partnerships: Australia-NZ disaster response in Fiji, Tonga, PNG, Vanuatu after cyclones, earthquakes, tsunamis [36]

Ethical Framework Activation: Ethics committees, triage officers independent of treating clinicians, appellate review processes for allocation disputes [37]

Crisis Standards of Care

Conceptual Framework

Usual Care: Individual patient optimization, unlimited resource assumption Crisis Standards of Care: Population health focus, altered clinical practices, transparent shift in goals when resources overwhelmed [38,39]

IOM (Institute of Medicine) Definition: "A substantial change in usual healthcare operations and the level of care it is possible to deliver, made necessary by a pervasive or catastrophic disaster." [40]

Triggers for Activation:

ICU bed occupancy >100% conventional capacity
Ventilator availability <24-48 hours projected supply
Critical drug shortages
Staff absenteeism >20-30%
Inability to transfer patients to other facilities

Ethical Principles

Utilitarian Framework: Maximize lives saved, life-years saved, or quality-adjusted life-years (QALYs). [41]

Egalitarian Considerations: Equal moral worth, procedural fairness, lottery systems, first-come first-served. [42]

Prioritarian Approach: Weighted consideration for worst-off (young, those who haven't lived full life span). [43]

Reciprocity: Recognize healthcare workers, essential workers who assumed risk for community benefit. [44]

Principles for Crisis Triage:

Duty to care (within safety limits)
Duty to steward resources (population health obligation)
Distributive justice (fair allocation, procedural transparency)
Transparency (public communication of criteria)
Consistency (apply criteria uniformly, avoid bias)
Proportionality (least restrictive means to achieve goals)
Accountability (review processes, appeals, post-event evaluation)

Ventilator Allocation Protocols

Protocol Components:

Inclusion Criteria: All patients requiring mechanical ventilation (COVID-19, trauma, stroke, cardiac arrest, etc.)
Exclusion Criteria: Controversial - some protocols exclude severe baseline disability, advanced dementia, terminal illness
Prioritization Score: Combination of severity of illness (SOFA), comorbidities, prognosis
Reassessment: 48-120 hours - are patients improving? If no improvement or worsening, consider reallocation
Reallocation (Withdrawal): Removal of ventilator from patient not improving to allocate to patient with better prognosis

Example: University of Pittsburgh Protocol: [45]

Sequential Organ Failure Assessment (SOFA) score at presentation
Exclusion criteria: severe irreversible neurological injury, metastatic cancer, NYHA Class IV heart failure, severe COPD (home oxygen + FEV1 <25%)
Daily reassessment at 48, 120 hours
Triage officer (not treating physician) makes allocation decisions
Appeals process

Criticisms:

Disability Discrimination: Exclusion criteria may violate rights of disabled persons, elderly, chronically ill [46,47]
Prognosis Uncertainty: SOFA scores imperfect predictors for individuals
Procedural Challenges: Who decides? How to operationalize withdrawal?
Psychological Burden: Clinicians experience moral distress when withdrawing ventilators from stable patients [48]

Alternative: Lottery with Categorical Exclusions: [49]

Exclude only patients with imminent death (<7 days prognosis)
Among all others, random allocation (lottery)
Avoids value judgments about quality of life, disability, age
Trades efficiency (lives saved) for equality (equal chance)

ANZICS Statement: [50]

Triage decisions based on likelihood of survival, not age/disability alone
Transparent, evidence-based, reviewable
Independent triage officer, separate from bedside clinicians
Aboriginal and Torres Strait Islander, Māori, Pacific Islander communities included in protocol development
Cultural safety, family involvement, support for traditional practices

Decontamination and Personal Protective Equipment

Chemical Decontamination

HAZMAT Principles: Contaminated patients pose risk to healthcare workers, hospital infrastructure. [51]

Decontamination Process:

Disrobe: Remove all clothing (removes 80-90% of contaminant)
Irrigation: Copious water irrigation (avoid high-pressure; may drive chemicals into wounds)
Soap and Water: Gentle washing with mild soap
Rinse: Thorough rinse, avoid hypothermia in cold environments
Dry and Dress: Clean clothing, blankets

Hot/Warm/Cold Zones:

Hot Zone: Contaminated area, HAZMAT suits required
Warm Zone: Decontamination area, Level C protection (SCBA or PAPR)
Cold Zone: Clean area, hospital entry permitted after decontamination

Specific Agents:

Nerve Agents (organophosphates, sarin, VX): Atropine, pralidoxime (2-PAM), benzodiazepines; decontamination before hospital entry [52]
Blister Agents (mustard gas, lewisite): Immediate decontamination critical; no antidote
Pulmonary Agents (chlorine, phosgene): Supportive care, mechanical ventilation
Cyanide: Hydroxocobalamin, sodium thiosulfate; rapid deterioration [53]

Biological Decontamination

Infectious Agents: Anthrax, smallpox, plague, viral hemorrhagic fevers (Ebola, Marburg). [54]

Decontamination:

Standard precautions + contact/droplet/airborne as appropriate
Soap and water sufficient for most biological agents (not chemical decontamination required)
Smallpox: Airborne isolation, vaccination of exposed healthcare workers within 3-4 days
Viral Hemorrhagic Fevers: Strict isolation, PPE (PAPR, impermeable gown, double gloves, face shield)

Airborne Infection Isolation Rooms (AIIRs): Negative pressure, 12+ air changes/hour, N95/P2 respirators. [55]

Radiological/Nuclear Decontamination

Radiation Injury Types:

External Contamination: Radioactive particles on skin/clothing (remove by disrobe, wash)
Internal Contamination: Inhalation, ingestion (potassium iodide for radioiodine, Prussian blue for cesium/thallium, DTPA for transuranics)
Acute Radiation Syndrome (ARS): Whole-body exposure >1 Gy; hematopoietic syndrome (2-10 Gy), GI syndrome (>10 Gy), CNS syndrome (>20 Gy) [56]

Decontamination Priority: Life-threatening injuries first, then decontamination (radiation rarely immediately life-threatening). [57]

Radiation Detection: Geiger counters, dosimetry; measure background, patient, and environment.

Hospital Preparation: Designate decontamination area, minimize contamination spread (plastic sheeting, controlled entry/exit), protect staff (dosimetry badges, time/distance/shielding principles). [58]

Personal Protective Equipment (PPE)

Levels of Protection:

Level A: SCBA, fully encapsulating chemical-resistant suit (HAZMAT, unknown agents)
Level B: SCBA or PAPR, chemical-resistant suit (known chemical, dermal protection needed)
Level C: Air-purifying respirator (APR), chemical-resistant suit (known agent, safe concentration)
Level D: Standard work uniform (no respiratory/chemical hazard)

Healthcare PPE for Infectious Diseases:

Standard Precautions: Gloves, hand hygiene
Contact Precautions: Gown, gloves (MRSA, VRE, C. difficile)
Droplet Precautions: Surgical mask, eye protection (influenza, COVID-19 in some contexts)
Airborne Precautions: N95/P2 respirator, negative pressure room (TB, measles, COVID-19, smallpox)

Fit Testing: N95/P2 respirators require annual quantitative or qualitative fit testing; facial hair prevents seal. [59]

Conservation During Shortages: Extended use (wear same mask for multiple patient encounters), limited reuse (remove and re-don same mask), decontamination (UV, vaporized hydrogen peroxide), crisis strategies (prioritize aerosol-generating procedures). [60]

Psychological First Aid and Post-Disaster Support

Psychological Impact of Disasters

Affected Populations:

Survivors and Families: Acute stress, PTSD (5-30% depending on disaster severity), depression, anxiety, grief, survivor guilt [61]
Healthcare Workers: Burnout, compassion fatigue, moral injury, PTSD (30-40% of disaster responders), substance abuse [62,63]
Community: Collective trauma, economic loss, displacement, loss of cultural sites/practices

Risk Factors for PTSD/Depression:

Severity of exposure (injury, loss of loved ones, property destruction)
Pre-existing mental health conditions
Lack of social support
Displacement from home/community
Ongoing stressors (unemployment, housing insecurity)
Cultural/spiritual disconnection (Indigenous populations displaced from Country/whenua) [64]

Psychological First Aid (PFA)

Evidence-Based Early Intervention: PFA is widely recommended despite limited RCT evidence; expert consensus based on stress theory and clinical experience. [65]

Core Principles (WHO/IASC):

Prepare: Understand disaster context, culture, available services
Look: Assess safety, identify people with urgent needs, check for immediate distress
Listen: Approach respectfully, listen actively without pressure to talk, accept feelings, provide comfort
Link: Connect to services (medical, shelter, food, family tracing), provide information on coping strategies

What NOT to Do:

Force people to talk about trauma
Use psychological debriefing (CISD - Critical Incident Stress Debriefing; evidence suggests may worsen PTSD) [66]
Promise outcomes beyond your control
Tell people they are "lucky" or minimize suffering
Share details of your own trauma/stress

Healthcare Worker Support

Organizational Strategies:

Adequate Rest: Mandatory breaks, shift length limits (12 hours maximum), sleep facilities
Basic Needs: Food, hydration, hygiene, childcare, transportation
Psychological Services: Confidential counseling, peer support, stress management training
Transparent Communication: Regular updates, recognition of contributions, clarity about resource constraints
Moral Support for Difficult Decisions: Ethics consultation, structured debriefing (not CISD), acknowledgment of moral distress [67]

Long-Term Support: Ongoing mental health screening, treatment for PTSD/depression, workplace culture that destigmatizes help-seeking. [68]

Australian Context: Beyond Blue, Lifeline, Black Dog Institute resources for healthcare workers; state-based employee assistance programs (EAPs).

Indigenous Community Support

Cultural Considerations:

Collective Trauma: Disasters affect entire communities, kinship networks; individual counseling insufficient
Connection to Country/Whenua: Land has spiritual significance; displacement causes profound grief
Cultural Healing Practices: Smoking ceremonies, Welcome to Country, sorry business protocols, yarning circles [69]
Community-Led Response: Aboriginal and Torres Strait Islander Health Workers, Māori Health Workers, Elders central to recovery
Language: Provide interpreters, culturally appropriate written materials
Historical Trauma: Compounded by colonization, forced removal, intergenerational trauma; disasters trigger collective memories [70]

Pacific Island Disaster Response: Strong community networks, church organizations central to support; acknowledge cultural practices around death, mourning, spirituality. [71]

Australian and New Zealand Disaster Preparedness

ANZICS Disaster Response Framework

ANZICS (Australian and New Zealand Intensive Care Society) Disaster Plan Components: [72]

Hazard Identification: Bushfires, cyclones, earthquakes, pandemics, terrorism
Surge Capacity Assessment: Current ICU beds, ventilators, staff, supplies
Activation Protocols: Triggers for conventional/contingency/crisis capacity
Triage Frameworks: Allocation protocols, ethics review, appeals process
Communication: Hospital command, regional coordination, national coordination
Training and Drills: Annual exercises, tabletop simulations, full-scale drills
Post-Event Review: After-action reporting, lessons learned, protocol revision

State Emergency Services Coordination

Australia: State/territory responsibility for disaster management; federal assistance via Australian Government Disaster Response Plan (COMDISPLAN). [73]

Emergency Management Australia (EMA): National coordination, Australian Medical Assistance Teams (AUSMAT)
AUSMAT: Deployable medical teams for domestic and international disasters (Christchurch earthquake 2011, Fiji cyclones, COVID-19 response)
National Critical Care and Trauma Response Centre (NCCTRC): Darwin-based; specialist retrieval, mass casualty response

New Zealand: Civil Defence Emergency Management (CDEM), regional coordination, National Health Emergency Plan. [74]

NZ Medical Assistance Team (NZMAT): Deployable teams for Pacific region disasters
Health Emergency Management Information System (HEMIS): Resource tracking, bed availability, supply chain

Bushfire Response (Black Saturday Lessons)

2009 Black Saturday Bushfires:

173 deaths, 414 injuries, peak ICU demand for burns, inhalation injury, trauma
Lessons Learned: [75]
- Need for aeromedical retrieval coordination (RFDS, state air ambulances, military)
- Burns surge capacity (regional burn centers, interstate transfers)
- Smoke inhalation management (early intubation for airway edema, bronchoscopy for soot, carbon monoxide/cyanide toxicity)
- Psychological support for rural communities (long-term mental health impact)
- Cultural safety for Aboriginal communities (sacred sites destroyed, displacement)

Current Preparedness: Fire Danger Ratings, Total Fire Ban days, evacuation protocols, designated relief centers, pre-positioning of resources during high-risk periods.

Cyclone and Flood Response

Cyclone Preparedness: Queensland, Northern Territory, Western Australia tropical cyclone belt; hospital structural reinforcement, evacuation protocols (Category 4-5 cyclones may require hospital evacuation), supply stockpiling. [76]

Flood Response: Queensland, NSW flood plains; infrastructure damage, prolonged power outages, water contamination, vector-borne disease (Ross River virus, dengue in tropics).

Case Study - Queensland Floods 2010-2011: ICU patients evacuated via helicopter, boat; coordination with RFDS, Army; post-flood mental health support for affected communities.

Earthquake Preparedness (Christchurch 2011)

New Zealand Earthquake Risk: Alpine Fault, Hikurangi Subduction Zone; Wellington and Christchurch high-risk areas. [77]

Christchurch Earthquake Response (February 2011):

185 deaths, 6,000+ injuries
Christchurch Hospital (tertiary center) structurally damaged but operational
Hospital evacuation of Princess Margaret Hospital (elderly care facility)
Australian medical teams (AUSMAT), international Urban Search and Rescue (USAR) teams
Lessons: Structural resilience of hospitals, backup power/water/communications, triage in damaged infrastructure, psychological support for prolonged recovery (CBD closed for years) [78]

Volcanic Eruption Response (Whakaari/White Island 2019)

December 9, 2019: Volcanic eruption on tourist island; 22 deaths, 25 severely burned survivors (30-95% TBSA). [79]

ICU Response:

Multiple patients with 60-80% TBSA burns, inhalation injury, blast trauma
Distributed across New Zealand burn centers and Australian burn units (Melbourne, Sydney, Brisbane)
International retrieval coordination
Skin bank mobilization (limited cadaveric allograft supply)
Prolonged ICU stays (weeks to months), multiple surgeries
Ethical challenges (some patients non-viable prognosis, family decision-making for international tourists)

Lessons: Need for regional burn surge capacity, international agreements for patient transfer, psychological support for whānau, cultural considerations for Māori (tapu status of bodies, tikanga around organ donation/skin grafts).

Pandemic ICU Surge (COVID-19 Lessons)

COVID-19 Pandemic (2020-2023): Greatest healthcare challenge in modern history. [80,81]

Australia and New Zealand Response:

Border Closures: Australia and NZ closed borders March 2020; managed quarantine reduced community transmission
ICU Surge Planning: Expansion from ~2,200 to ~7,000 ICU beds (ventilator procurement, staffing models, PPE stockpiles)
Crisis Standards Activation: NSW, Victoria activated crisis frameworks during Delta (2021) and Omicron (2022) waves
Ventilator Allocation Protocols: Developed but not fully enacted (demand never exceeded supply in Australia/NZ, unlike Italy, UK, US)
Healthcare Worker Wellbeing: High rates of burnout, PTSD, moral injury; inadequate mental health support [82]
Vaccine Rollout: Delayed rollout in early 2021; accelerated mid-2021; high vaccination rates (>95% adults) reduced ICU demand by late 2022

Ethical Challenges:

Visitor restrictions (family exclusion from ICU; profound impact on end-of-life care, Indigenous cultural practices)
Allocation of monoclonal antibodies, antivirals (sotrovimab, nirmatrelvir/ritonavir)
Vaccine prioritization (elderly, Indigenous communities, healthcare workers)
Balancing individual liberties (lockdowns, mandates) with public health

Indigenous Impact:

Aboriginal and Torres Strait Islander peoples: 3-5x higher COVID-19 hospitalization, 2-3x higher ICU admission [83]
Māori: 2-3x higher hospitalization rates [84]
Barriers: Geographic remoteness, chronic disease burden, vaccine hesitancy (historical trauma, mistrust), overcrowded housing
Culturally safe response: Aboriginal and Māori-led vaccine campaigns, community health workers, telehealth in remote areas

Lessons for Future Pandemics:

Early border control effective (NZ "elimination" strategy 2020-2021)
Surge capacity planning essential (but sustained surge causes healthcare worker burnout)
Clear communication, transparency, equity-focused allocation frameworks
Visitor policies must balance infection control with cultural/psychological needs
Mental health support for healthcare workers is critical, not optional [85]

Pacific Island Disaster Partnerships

Australia and New Zealand Role: Regional leaders in disaster response for Pacific island nations (Fiji, Tonga, Samoa, Vanuatu, PNG, Solomon Islands, Kiribati, Tuvalu). [86]

Recent Responses:

Cyclone Pam (Vanuatu, 2015): AUSMAT/NZMAT deployed, field hospitals, medical supplies
Tonga Volcanic Eruption and Tsunami (2022): Hunga Tonga-Hunga Ha'apai eruption; NZDF, ADF delivered supplies, medical assistance; communication cables severed
PNG Earthquake (2018): Highlands earthquake; AUSMAT deployed to remote areas, helicopter-based clinics

Challenges: Geographic isolation, limited local healthcare infrastructure, climate change (sea level rise, intensifying cyclones), cultural and linguistic diversity, post-colonial tensions.

Partnerships: Pacific Island Health Officers Association (PIHOA), Pacific Community (SPC), WHO Western Pacific Region.

Communication Systems and Incident Command

MIMMS (Major Incident Medical Management and Support)

International Framework: Developed in UK, used in Australia, NZ, UK, Europe for MCI response. [87]

Principles:

Command: Clear leadership, unified command structure
Safety: Scene safety for responders (assess hazards before entry)
Communication: Interoperable radios, liaison officers, situational reports
Assessment: Rapid scene assessment (number of casualties, severity, hazards, resources needed)
Triage: START, SALT, or local protocols
Treatment: On-scene stabilization (control bleeding, airway, shock)
Transport: Coordinate ambulances, helicopters; avoid overwhelming single hospital

METHANE Report (initial scene report):

Major incident declared
Exact location
Type of incident (fire, explosion, chemical, etc.)
Hazards present or potential
Access routes (for emergency vehicles)
Number of casualties (approximate, by category)
Emergency services present and required

CSCATTT (Mnemonic for Scene Organization)

Command: Incident commander appointed Safety: Scene hazard assessment Communication: Establish communication networks Assessment: Scene survey, casualty estimation Triage: Triage officer assigned, casualties categorized Treatment: Treatment area established Transport: Transport officer coordinates ambulances, hospital destination

Both MIMMS and CSCATTT emphasize structured, systematic approach to chaotic MCI environments. [88]

Hospital Incident Management System (HIMS)

Structured Hierarchy:

Incident Commander (usually hospital CEO or designate): Overall authority
Operations Section: Clinical care (ED, ICU, OR, wards), triage, treatment
Planning Section: Resource tracking, situational awareness, demobilization planning
Logistics Section: Supplies, equipment, facilities, communications, IT
Finance/Administration Section: Cost tracking, documentation, legal issues

Activation Levels: Vary by institution; typically Level 1 (routine), Level 2 (alert/standby), Level 3 (full activation/MCI).

Communication Tools: Whiteboards, electronic tracking systems, regular briefings (every 2-4 hours), liaison with external agencies.

Documentation: Critical for post-event review, legal accountability, insurance, public reporting. [89]

Assessment Content

SAQ Practice Question 1: Disaster Triage and Ethical Frameworks (15 marks)

Question:

You are the ICU director during a Category 5 cyclone that has devastated a regional city in Far North Queensland. Your 12-bed ICU is operating at crisis capacity with 18 mechanically ventilated patients (6 in PACU, using OR ventilators). External assistance is delayed 48-72 hours due to infrastructure damage. A 32-year-old previously healthy Aboriginal woman with severe community-acquired pneumonia (SOFA 8) requires mechanical ventilation, but no ventilators are available. A 78-year-old man with metastatic lung cancer, COPD (home oxygen), and ICU-acquired pneumonia (ventilated 14 days, SOFA 11, no improvement) currently occupies a ventilator.

a) Describe the ethical frameworks that guide ventilator allocation during disaster conditions. (5 marks)

b) Outline the process for determining whether to reallocate the ventilator from the 78-year-old man to the 32-year-old woman. (6 marks)

c) Discuss the cultural considerations relevant to this Aboriginal patient and her family. (4 marks)

Model Answer:

a) Ethical Frameworks for Ventilator Allocation (5 marks):

Utilitarian Framework (1.5 marks): Maximize overall benefit (lives saved, life-years saved, QALYs). Prioritize patients with highest probability of survival and longest expected post-ICU life expectancy. Utilitarian approach supports allocating ventilator to 32-year-old with better prognosis. [41]

Egalitarian Framework (1 mark): Equal moral worth of all persons; procedural fairness (first-come first-served, lottery). Egalitarian approach may favor 78-year-old who already has ventilator (possession priority). [42]

Prioritarian Framework (1 mark): Weighted consideration for worst-off; "fair innings" argument suggests young person who hasn't lived full lifespan has stronger claim. Supports 32-year-old. [43]

Distributive Justice Principles (1.5 marks): Allocation must be transparent, consistent, non-discriminatory (avoid bias based on disability, age, race), accountable (appeals process), and proportionate (least restrictive means to achieve public health goals). Requires independent triage officer, not bedside clinician, to make allocation decisions. [37,38]

b) Reallocation Process (6 marks):

Step 1 - Prognostic Assessment (1.5 marks): Apply objective severity of illness scoring (SOFA). 78-year-old has SOFA 11, metastatic cancer (poor long-term prognosis), COPD (chronic organ dysfunction), and 14-day ventilation without improvement (poor trajectory). 32-year-old has SOFA 8, no chronic illness (better baseline), and acute reversible process (CAP). Prognostic models favor younger patient, but individual prediction is uncertain. [19,20]

Step 2 - Exclusion Criteria Review (1 mark): Some protocols exclude metastatic cancer, severe COPD; however, exclusion criteria must be evidence-based and avoid arbitrary discrimination. [45,46]

Step 3 - Independent Triage Officer (1.5 marks): Decision made by triage officer independent of bedside ICU team to avoid conflict of interest. Triage officer reviews medical records, consults treating clinicians for clinical details (not allocation decision), applies allocation protocol consistently. [37]

Step 4 - Family Communication (1.5 marks): Both families informed of resource scarcity, allocation process, and decision. Transparent explanation of criteria (not "rationing" but "stewardship of scarce resources for maximum benefit"). Acknowledge emotional difficulty; offer palliative care for patient not allocated ventilator. For Aboriginal woman, involve Aboriginal Health Worker/Aboriginal Liaison Officer. [90]

Step 5 - Appeals Process (0.5 marks): Rapid appellate review available (ethics committee, senior clinicians not involved in initial decision) if family contests decision. [37]

c) Cultural Considerations for Aboriginal Patient (4 marks):

Family and Community Decision-Making (1 mark): Aboriginal and Torres Strait Islander cultures emphasize collective decision-making involving extended family, Elders, and community. Individual consent model may be inappropriate; allow time for family meetings, include Elders in discussions. [8,9]

Communication (1 mark): Use Aboriginal Health Worker or Aboriginal Liaison Officer as cultural broker. Yarning (conversational, story-based communication) more effective than direct medical jargon. Avoid direct eye contact if culturally inappropriate. Acknowledge language barriers (English may be second or third language). [69]

Cultural Protocols (1 mark): If patient deteriorates/dies, sorry business protocols apply (family may need to return to Country, gender-specific mourning practices, cultural restrictions on speaking name of deceased). Allow family presence (visitor restrictions may conflict with cultural needs). Respect wishes regarding organ donation/autopsy (cultural concerns about body integrity). [10]

Health Disparities and Mistrust (1 mark): Aboriginal and Torres Strait Islander peoples experience health disparities (8-10 years lower life expectancy), historical trauma (Stolen Generations, forced removal), and ongoing systemic discrimination. Disaster allocation decisions must not perpetuate inequity (e.g., excluding patients with chronic disease disproportionately affects Indigenous peoples). Transparent, culturally safe process essential to maintain trust. [83]

SAQ Practice Question 2: Disaster Response and Surge Capacity (15 marks)

Question:

A passenger train derailment in metropolitan Sydney results in 8 deceased, 35 critically injured, and 120 with minor injuries. Your tertiary ICU (24 beds, currently 20 occupied) receives notification of 12 incoming trauma patients requiring mechanical ventilation, damage control surgery, and ICU care arriving within 2 hours.

a) Describe the 4S framework for ICU surge capacity and its application to this scenario. (8 marks)

b) Outline the principles of mass casualty triage and how they differ from routine ICU triage. (4 marks)

c) Discuss the decontamination considerations if 5 patients are contaminated with diesel fuel. (3 marks)

Model Answer:

a) 4S Framework for ICU Surge Capacity (8 marks):

Space (2 marks):

Conventional capacity: 4 ICU beds currently available
Contingency capacity (2-4 hours): Repurpose PACU (8-10 beds with anesthesia ventilators), cardiac catheterization lab (2-3 monitored beds), step-down unit (convert to ICU level care, 4-6 beds). Ensure oxygen, suction, electrical capacity sufficient for ventilators and infusion pumps. [24,25]
Crisis capacity (4-12 hours if needed): Convert OR recovery bays, endoscopy suite; may require canceling elective surgery to free OR ventilators and staff
Total achievable: 20-30 ICU-level beds within 4 hours in tertiary center [26]

Staff (2 marks):

Conventional staffing: 1 nurse : 1 patient (standard ICU)
Contingency staffing: Recall off-duty ICU nurses, redeploy PACU/cardiac ICU nurses to general ICU, anesthesia consultants/registrars for ventilator management, 1 nurse : 2 patients with resident/registrar support [28]
Crisis staffing (if required): 1 experienced ICU nurse supervises 2 less-experienced nurses (each managing 1-2 patients), medical students/non-clinical volunteers for non-nursing tasks (documentation, supply running)
Coordination: Activate hospital incident management system, designate ICU operations coordinator, brief staff on surge protocols
Wellbeing: Provide food, breaks, psychological support, clear communication

Supplies (2 marks):

Immediate needs: 12 ventilators (4 ICU, 8 PACU/OR ventilators), vasoactive drugs (norepinephrine, vasopressin), sedation/analgesia (propofol, fentanyl, midazolam, ketamine), blood products (massive transfusion protocol for trauma), CVC/arterial line kits [31]
Inventory check: Pharmacy assesses drug stock, blood bank confirms availability (notify state blood service if massive transfusion anticipated), biomedical engineering ensures backup ventilators functional
Resupply: Activate hospital supply chain, coordinate with state health emergency stockpile if needed, consider inter-hospital resource sharing

Systems (2 marks):

Hospital Incident Management System (HIMS): Activate Level 3 (full MCI response); incident commander coordinates operations, planning, logistics, finance sections [89]
Communication: ED-ICU-OR coordination for patient flow, ICU bed availability updated every 30 minutes, liaison with state ambulance (coordinate incoming patients to avoid overwhelming single facility), media liaison (public communication)
Clinical protocols: Activate damage control surgery protocols, massive transfusion protocol, ICU admission triage criteria, crisis standards of care if resources exhausted [38]
Documentation: Track patient flow, resource use, decisions made for post-event review

b) Mass Casualty Triage vs. Routine ICU Triage (4 marks):

Routine ICU Triage (1.5 marks): Prioritize sickest patients first, unlimited resource assumption, individual patient optimization, shared decision-making with family, extended prognostication discussions. [11]

Mass Casualty Triage (2.5 marks):

Goal Shift: Maximize survivors (population health focus), not individual optimization [11,12]
Resource Allocation: Allocate ICU beds/ventilators to patients most likely to benefit (balance severity with prognosis); may defer care to less critically injured if they have better prognosis
Time Constraints: Rapid triage (minutes), defer non-urgent admissions, streamlined consent (implied consent for life-saving interventions)
Dynamic Reassessment: Continuous re-triage as patients arrive, clinical status changes, resources consumed/replenished
Ethical Framework: Utilitarian (maximize lives saved) rather than individual duty of care; transparent criteria, independent triage officer [41]

Example: If 12 patients arrive simultaneously, prioritize trauma patients with high injury severity score but salvageable injuries (e.g., traumatic brain injury with GCS 9-12, flail chest requiring ventilation, pelvic fracture with hemorrhage); defer patients with minor injuries (observation) or unsurvivable injuries (expectant/palliative care).

c) Decontamination for Diesel Fuel Contamination (3 marks):

Diesel Fuel Characteristics (0.5 marks): Petroleum product, dermal irritant, aspiration risk if ingested/inhaled; not highly toxic but requires decontamination to prevent hospital contamination, fire risk (flashpoint 52-96°C), environmental contamination. [51]

Decontamination Process (1.5 marks):

Field decontamination preferred: Ambulance/fire service should decontaminate on-scene; alert ED if contaminated patients incoming
Hospital decontamination (if not completed in field): Establish outdoor decontamination area (warm zone), remove all clothing (discard in hazardous waste bags), irrigation with copious water (avoid high-pressure spray), wash with mild soap, rinse thoroughly, dry and provide clean clothing/blankets [51]
Hot/Warm/Cold zones: Contaminated patients in warm zone until decontaminated; only enter cold zone (hospital) after decontamination confirmed (visual inspection, no odor)

PPE for Healthcare Workers (0.5 marks): Level C protection for decontamination team (chemical-resistant gown, gloves, face shield, respirator if vapors present); standard PPE sufficient after decontamination complete. [51]

Prevent Hospital Contamination (0.5 marks): Isolate ambulance bay, ventilate decontamination area, avoid diesel entering hospital drains (environmental contamination), coordinate with HAZMAT team if available, document exposure for worker safety monitoring. [58]

Viva Scenario 1: Pandemic ICU Surge and Allocation (20 marks)

Scenario Introduction:

You are the ICU director at a tertrial metropolitan hospital during a severe influenza pandemic. Your 30-bed ICU is at 140% capacity (42 mechanically ventilated patients, using all PACU and OR ventilators). ICU mortality is 35%, average length of stay 14 days. The state has activated crisis standards of care. A 45-year-old nurse with influenza pneumonia (SOFA 9, no comorbidities) requires mechanical ventilation, but no ventilators are available. A 68-year-old retired teacher with influenza pneumonia (SOFA 12, diabetes, ischemic heart disease, ventilated 12 days, no improvement) currently occupies a ventilator.

Examiner: What ethical principles guide your decision-making in this scenario?

Candidate: This is a crisis standards of care situation where I must shift from individual patient optimization to population health focus. The ethical principles guiding ventilator allocation include:

Utilitarianism: Maximize overall benefit - lives saved and life-years saved. This supports allocating the ventilator to the patient most likely to survive and have longest post-ICU life expectancy.
Distributive justice: Fair, transparent, consistent allocation process without discrimination based on age, disability, race, or socioeconomic status. Requires independent triage officer and appeals process.
Stewardship: Duty to responsibly manage scarce resources for maximum community benefit.
Proportionality: Use least restrictive means to achieve public health goals; ventilator reallocation is a last resort after all surge capacity exhausted.

The 45-year-old nurse has lower SOFA score, no chronic comorbidities, and potentially longer life expectancy. The 68-year-old has higher SOFA score, comorbidities, and 12 days without improvement suggesting poor trajectory. However, individual prognostication is uncertain.

Examiner: The 68-year-old's family argues that "he was here first" and it's unfair to withdraw his ventilator. How do you respond?

Candidate: I would acknowledge their distress and explain with compassion:

"I understand this is devastating. In normal circumstances, we would continue his care as long as medically appropriate. However, we are in a crisis where demand for ventilators far exceeds supply, and we have a duty to allocate resources to maximize lives saved across the entire community.

The allocation decision is not based on who arrived first, but on medical criteria: likelihood of survival and expected benefit from ICU care. An independent triage officer, not his bedside doctors, reviews all cases daily using objective criteria. Unfortunately, his illness severity score and lack of improvement over 12 days suggest lower probability of survival compared to newly arriving patients.

This is not giving up on him - we will provide palliative care to ensure comfort. If a ventilator becomes available (another patient recovers or dies), he may be reconsidered. There is also an appeals process through the hospital ethics committee if you believe the decision was incorrect."

This balances honesty, compassion, and explanation of the allocation framework.

Examiner: What about the fact that she's a healthcare worker who was infected while caring for patients?

Candidate: This raises the ethical principle of reciprocity - recognizing those who assumed risk for community benefit. Some allocation frameworks give weighted priority to healthcare workers and essential workers as a form of societal obligation.

However, reciprocity is controversial:

Pro: Healthcare workers are essential for pandemic response; prioritizing them preserves workforce capacity and incentivizes continued service despite personal risk
Con: May violate egalitarian principles (equal moral worth); creates two-tier system; difficult to define "essential" (are grocery workers, transport workers equally essential?)

The ANZICS guidance does not explicitly prioritize healthcare workers in ventilator allocation, focusing instead on medical prognosis. However, I would consider it a tiebreaker if two patients had similar prognosis - the healthcare worker would receive ventilator.

In this case, the 45-year-old nurse has better prognosis independent of her profession, so reciprocity is not the determining factor.

Examiner: Walk me through the operational steps of reallocating the ventilator.

Candidate:

Step 1 - Independent Triage Officer Review: The triage officer (senior intensivist not involved in bedside care) reviews both patients' medical records, SOFA scores, comorbidities, clinical trajectory, and prognosis. Applies the state-approved allocation protocol consistently.

Step 2 - Consultation: Triage officer consults bedside ICU team for clinical details ("Is there any clinical factor not captured in the scoring system that would change prognosis?") but does not delegate the allocation decision to bedside team (avoids conflict of interest).

Step 3 - Family Communication: Separate meetings with both families by triage officer and bedside team. Explain crisis situation, allocation criteria, decision rationale. For 68-year-old's family: explain compassionately, offer palliative care, provide appeals process information. For 45-year-old nurse's family: explain allocation decision, acknowledge uncertainty, consent for intubation.

Step 4 - Clinical Transition: For 68-year-old: withdraw mechanical ventilation, provide palliative sedation and analgesia (morphine infusion, midazolam), allow family presence, offer spiritual/cultural support. Monitor for respiratory distress; provide comfort measures. This is NOT euthanasia - natural dying process. For 45-year-old: intubate, initiate mechanical ventilation per ARDS protocols.

Step 5 - Documentation: Document allocation decision, criteria applied, family discussions, palliative care plan. This is essential for legal accountability, ethics review, post-pandemic evaluation.

Step 6 - Reassessment: Daily review of allocation decisions. If 45-year-old deteriorates significantly, may need to reallocate again. If 68-year-old survives without ventilator (possible with non-invasive ventilation or spontaneous improvement), reassess need for reallocation.

Examiner: What support do you provide to the ICU team who must enact this decision?

Candidate: Withdrawing a ventilator from a stable patient to allocate to another is profoundly distressing and causes moral injury - the psychological impact of actions that violate one's moral code.

Support strategies:

Shared responsibility: Emphasize that this is a triage officer decision, not bedside clinician decision, to reduce individual guilt
Ethics consultation: Proactive ethics support, not just for families but for staff processing difficult decisions
Structured debriefing: Regular team meetings (not critical incident stress debriefing, which may worsen PTSD, but reflective discussion acknowledging emotional impact)
Psychological services: Confidential counseling, peer support, resources for PTSD/depression screening
Organizational messaging: Hospital leadership acknowledges the extraordinary burden, expresses gratitude, provides concrete support (meal vouchers, childcare, accommodation)
Adequate rest: Mandatory breaks, shift limits (12 hours maximum), rotate assignments so same staff not repeatedly involved in reallocation decisions
Moral support: Acknowledge that staff are acting ethically within crisis framework, not abandoning patients; crisis standards of care are a societal failure to prepare, not a clinician failure

Post-pandemic, long-term mental health follow-up is essential, as healthcare worker PTSD rates may be 30-40%.

Examiner: Are there alternative allocation frameworks that might avoid withdrawing ventilators?

Candidate: Yes. Some frameworks avoid the psychological burden of active withdrawal:

1. Lottery with Categorical Exclusions: Exclude only patients with imminent death (<7 days prognosis independent of ICU), then randomly allocate among all others. Avoids value judgments about quality of life, disability, age. Trades efficiency (lives saved) for equality (equal chance). May be more acceptable to public but saves fewer lives overall. [49]

2. First-Come First-Served with Time Limits: Allocate to first patients, but set time limits (e.g., 7-day trial; if no improvement, discontinue). Avoids active reallocation but may delay allocation to patients with better prognosis who arrive later. Less efficient.

3. Prioritize Reallocation from Patients Who Consent: Some protocols allow patients/families to prospectively consent to reallocation if their prognosis worsens and resources scarce. Ethically complex (coercion risk in crisis), but may reduce moral distress.

4. Dual Ventilation: Experimental strategy to ventilate 2 patients on 1 ventilator. NOT recommended by major societies (Anesthesia Patient Safety Foundation, Society of Critical Care Medicine, American Association for Respiratory Care) due to safety concerns (different lung mechanics, tidal volumes, pressures; cross-contamination; monitoring difficulty). Only considered in absolute crisis if no alternatives. [91]

The current evidence-based approach is prognosis-based allocation with independent triage officers and appeals processes, accepting the moral distress as an unavoidable consequence of resource scarcity.

Examiner: Thank you. Now, shifting focus - what are the key cultural considerations if the 45-year-old nurse is Māori?

Candidate: Māori health is governed by cultural values and obligations under Te Tiriti o Waitangi (Treaty of Waitangi), which obligates equitable healthcare for Māori.

Cultural Considerations:

Whānau (extended family) involvement: Decision-making is collective, involving whānau, not just individual or immediate family. Allow time for whānau hui (family meeting), include kaumātua (elders).
Māori Health Workers: Engage Māori Health Workers as cultural liaisons for communication, tikanga (cultural protocols), spiritual support.
Tikanga and manaakitanga: Respect for cultural practices (karakia/prayer, waiata/song, spiritual rituals). Hospital policies on visitor restrictions may conflict with cultural needs (whānau presence essential during critical illness).
Holistic health concept: Māori health models (Te Whare Tapa Whā - four cornerstones: taha tinana/physical, taha hinengaro/mental, taha whānau/family, taha wairua/spiritual) emphasize holistic wellness, not just biomedical treatment.
Health disparities: Māori experience 2-3x higher ICU admission rates for many conditions (influenza, COVID-19), shorter life expectancy (7-8 years), higher chronic disease burden due to systemic inequities (colonization, socioeconomic disadvantage, healthcare access barriers). Allocation protocols must not perpetuate discrimination.
Tapu (sacredness): Head is sacred; body integrity important. Discuss organ donation, autopsy sensitively with cultural considerations.
Passing: If patient dies, whānau may practice tangihanga (funeral rites), which may require extended time with body, returning body to marae (community meeting ground). Hospital policies must accommodate cultural practices.

Pandemic allocation decisions affecting Māori patients must be transparent, equitable, and developed with Māori community consultation to maintain trust and address historical inequities.

Viva Scenario 2: Chemical Disaster and Decontamination (20 marks)

Scenario Introduction:

You are the ICU director when a chlorine gas leak at an industrial facility results in 3 deceased at scene, 25 exposed workers transported to your hospital. Five patients arrive with respiratory distress (cough, wheeze, hypoxemia), one is intubated in the ED for severe bronchospasm and hypoxemic respiratory failure. Four more patients have minor symptoms (cough, eye irritation).

Examiner: What are your immediate priorities?

Candidate:

1. Responder Safety: Ensure decontamination completed before patients enter hospital. Chlorine gas is a pulmonary irritant; contaminated patients pose risk to healthcare workers and hospital environment. Confirm with ambulance/fire service that decontamination was performed on-scene. If not, activate hospital decontamination protocols immediately.

2. Activate Hospital Incident Management System: Notify hospital command, activate MCI protocols, alert ICU, ED, respiratory therapy, pharmacy, and biomedical engineering of potential surge in respiratory failure patients requiring mechanical ventilation.

3. Clinical Assessment and Triage: Classify patients by severity:

Immediate (Red): Severe respiratory distress, hypoxemia, bronchospasm requiring intubation
Delayed (Yellow): Moderate symptoms (cough, wheeze) but stable, may deteriorate over 4-12 hours (delayed pulmonary edema)
Minor (Green): Mild symptoms (eye/throat irritation), observation and discharge likely

4. PPE for Healthcare Workers: Standard PPE (gown, gloves, face shield, surgical mask) sufficient once decontamination confirmed. If decontamination uncertain, Level C protection (chemical-resistant gown, respirator).

5. Antidote/Specific Therapy: Chlorine has no antidote; treatment is supportive (oxygen, bronchodilators, mechanical ventilation for severe cases). No role for sodium thiosulfate, hydroxocobalamin, or other chemical antidotes.

Examiner: One patient was not decontaminated on-scene and arrives with clothing smelling of chlorine. What do you do?

Candidate: This is a contamination emergency. I would:

1. Isolate Patient: Immediately isolate patient in ambulance bay or outdoor decontamination area (warm zone). Do NOT allow into ED or hospital (contamination risk).

2. Activate Decontamination Team: Notify HAZMAT team (fire service), hospital decontamination team, security (control access).

3. Decontamination Process:

Disrobe: Remove all clothing, place in sealed hazardous waste bags (removes 80-90% of contaminant)
Irrigation: Copious water irrigation (low-pressure; avoid aerosolizing chlorine)
Wash: Mild soap and water, gentle washing (avoid scrubbing; may abrade skin and enhance absorption)
Rinse: Thorough rinse, dry with clean towels
Provide clean clothing/blankets, avoid hypothermia (outdoor decontamination in winter)

4. PPE for Decontamination Team: Level C protection (chemical-resistant gown, gloves, face shield, respirator - N95 or P100 if chlorine vapors present).

5. Ventilate Area: Chlorine gas is heavier than air, may accumulate in low areas; ensure adequate ventilation.

6. Clinical Care After Decontamination: Once decontamination confirmed (visual inspection, no odor, no respiratory irritation to staff), patient can enter hospital for clinical care.

7. Staff Exposure Monitoring: Any staff exposed to chlorine vapors should be assessed for respiratory symptoms, oxygen saturation, chest X-ray if symptomatic. Document exposure for occupational health follow-up.

Examiner: What is the pathophysiology of chlorine gas toxicity and expected clinical course?

Candidate:

Pathophysiology:

Chlorine (Cl₂) is a potent oxidizing agent and pulmonary irritant. On contact with respiratory mucosa, chlorine forms hypochlorous acid (HOCl) and hydrochloric acid (HCl), causing:

Airway Injury: Direct epithelial damage, inflammation, mucosal sloughing, bronchospasm
Alveolar-Capillary Injury: Disruption of alveolar-capillary membrane, increased permeability, non-cardiogenic pulmonary edema (ARDS-like)
Surfactant Dysfunction: Impaired surfactant, atelectasis, V/Q mismatch
Oxidative Stress: Free radical generation, cellular injury

Clinical Course (dose-dependent):

Mild Exposure (1-3 ppm): Mucous membrane irritation (conjunctivitis, rhinitis, throat irritation), cough, resolves within hours with fresh air.

Moderate Exposure (5-15 ppm): Cough, wheeze, dyspnea, chest tightness, nausea/vomiting. May develop reactive airways dysfunction syndrome (RADS - persistent asthma-like symptoms).

Severe Exposure (>30 ppm): Severe bronchospasm, laryngeal edema, acute respiratory failure, delayed pulmonary edema (4-24 hours post-exposure - critical observation period). Chest X-ray may be normal initially, then develop bilateral infiltrates. Hypoxemic respiratory failure, ARDS, mechanical ventilation required.

Very High Exposure (>430 ppm): Immediate respiratory arrest, death within minutes.

Delayed Effects: Patients with moderate exposure may deteriorate 4-24 hours later due to pulmonary edema. Observation period of 24 hours recommended even if initially asymptomatic.

Examiner: How would you manage the intubated patient with chlorine-induced ARDS?

Candidate:

1. Lung-Protective Ventilation (ARDS Network Protocol):

Tidal volume 6 mL/kg ideal body weight (IBW)
Plateau pressure ≤30 cmH₂O
PEEP titrated to FiO₂ (PEEP/FiO₂ table from ARDSnet)
Target SpO₂ 88-95%, pH ≥7.30 (permissive hypercapnia acceptable)
Avoid excessive PEEP (may worsen barotrauma in airway injury) [92]

2. Bronchodilators:

Inhaled beta-agonists (salbutamol/albuterol) for bronchospasm (may require continuous nebulization)
Consider inhaled anticholinergics (ipratropium) for refractory bronchospasm
Systemic corticosteroids controversial (no clear evidence in chlorine toxicity; may consider if severe bronchospasm, but infection risk)

3. Oxygenation Strategies:

Prone positioning if severe ARDS (PaO₂/FiO₂ <150) - improves V/Q matching, recruitment [93]
Neuromuscular blockade if patient-ventilator dyssynchrony, high plateau pressures (cisatracurium infusion 48 hours) [94]
Inhaled pulmonary vasodilators (inhaled nitric oxide, inhaled epoprostenol) if refractory hypoxemia (reduce pulmonary hypertension, improve V/Q matching)
ECMO consideration if PaO₂/FiO₂ <80 despite optimal ventilation, prone positioning (consult ECMO center) [95]

4. Fluid Management:

Conservative fluid strategy (avoid fluid overload; worsens pulmonary edema) [96]
Target CVP <4 mmHg or negative fluid balance once hemodynamically stable
Diuretics (furosemide) if volume overload

5. Hemodynamic Support:

Norepinephrine if hypotension (septic shock may develop if secondary infection)
Avoid excessive fluids (worsens pulmonary edema)

6. Sedation/Analgesia:

Adequate sedation (propofol, midazolam, fentanyl) to facilitate mechanical ventilation, reduce oxygen consumption
Daily sedation holds per protocol once stable

7. Secondary Infection Prevention:

Chlorine-injured airways are susceptible to bacterial pneumonia (Pseudomonas, MRSA)
Surveillance cultures, empiric antibiotics if clinical sepsis (fever, leukocytosis, purulent secretions)
VAP prevention bundle (head-of-bed elevation, oral care, daily sedation holds, spontaneous breathing trials)

8. Monitoring:

Serial chest X-rays (progression of pulmonary edema)
ABG (oxygenation, ventilation, pH)
Ventilator mechanics (plateau pressure, driving pressure, compliance - trends indicate improvement or worsening)

9. Supportive Care:

Nutrition (early enteral nutrition if hemodynamically stable)
DVT/stress ulcer prophylaxis
Glycemic control

10. Weaning:

Daily spontaneous breathing trials once FiO₂ ≤50%, PEEP ≤8, no vasopressors, hemodynamically stable
Expect prolonged ventilation (1-3 weeks) for severe ARDS

Prognosis: Chlorine-induced ARDS has variable mortality (10-50% depending on exposure severity, co-injuries, age, comorbidities). Survivors may have long-term pulmonary sequelae (reactive airways, bronchiolitis obliterans, restrictive lung disease).

Examiner: What public health and communication considerations arise from this industrial disaster?

Candidate:

1. Scene Safety and Hazard Mitigation: Coordinate with fire service, environmental protection agency, and industrial facility to ensure chlorine leak contained, no ongoing public exposure. Evacuation of surrounding area if needed.

2. Community Communication:

Public health authorities issue exposure advisories (avoid area, seek medical care if symptomatic)
Media liaison officer provides updates (number of casualties, hospital status, no ongoing hazard)
Avoid speculation about cause (under investigation)

3. Occupational Health Investigation: WorkSafe (Australia) or WorkSafe NZ investigates industrial safety violations, adequacy of safety equipment (chlorine detection alarms, emergency response plans, worker PPE).

4. Environmental Impact: Chlorine contamination of waterways, soil; coordinate with environmental authorities for cleanup, monitoring.

5. Long-Term Health Surveillance: Exposed workers may develop chronic respiratory issues (reactive airways dysfunction syndrome, bronchiolitis obliterans); establish occupational health follow-up registry for long-term monitoring.

6. Healthcare Worker Support: Staff exposed to patients/contamination require psychological support (anxiety about chemical exposure, fear for own health), occupational health assessment, transparent communication about risks.

7. Legal and Insurance: Document thoroughly; industrial disaster may involve litigation (worker compensation, facility liability, regulatory penalties). Hospital documentation supports legal processes.

8. Lessons Learned: Post-incident debrief with all agencies (ambulance, fire, hospital, public health) to identify strengths, weaknesses, improve future response. Review hospital decontamination protocols, PPE stockpiles, communication systems.

9. Indigenous Community Considerations: If affected workers include Aboriginal or Torres Strait Islander, Māori, or Pacific Island workers, ensure culturally safe communication, involve community health workers, address language barriers, respect cultural practices if fatalities.

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Summary

Disaster medicine and mass casualty ICU management require healthcare systems to rapidly transition from individual-focused care to population health optimization under resource scarcity. Key competencies include:

Triage Frameworks: START, JumpSTART, SALT for field triage; prognostic scoring (SOFA, APACHE) for ICU allocation
Surge Capacity: 4S framework (Space, Staff, Supplies, Systems) to expand ICU capacity 2-3x baseline
Crisis Standards of Care: Ethical shift from usual care to crisis capacity when resources overwhelmed; requires transparent, equitable, accountable allocation protocols
Decontamination: Hot/warm/cold zones, PPE, chemical/biological/radiological agent-specific protocols
Psychological Support: Psychological first aid for survivors, healthcare worker wellbeing programs, Indigenous cultural healing
Australian/NZ Context: Bushfires, cyclones, earthquakes, volcanoes, pandemics; ANZICS disaster plans, AUSMAT/NZMAT, Pacific partnerships, Indigenous health equity

Intensivists must balance clinical expertise with ethical reasoning, cultural humility, and systems-level thinking to lead disaster response. Post-event review and continuous preparedness training are essential to build resilient healthcare systems.

Clinical board

Urgent signals

Exam focus

Editorial and exam context

Clinical Overview

Disaster Definitions and Classification

Disaster Typology

Mass Casualty Incident (MCI) Criteria

Australian and New Zealand Disaster Context

Mass Casualty Triage Principles

Triage Philosophy in Disasters

START Triage (Simple Triage And Rapid Treatment)

JumpSTART Triage (Pediatric Modification)

SALT Triage (Sort, Assess, Lifesaving Interventions, Treatment/Transport)

ICU-Specific Triage Considerations

Surge Capacity Planning: The 4S Framework

Space

Staff

Supplies

Systems

Crisis Standards of Care

Conceptual Framework

Ethical Principles

Ventilator Allocation Protocols

Decontamination and Personal Protective Equipment

Chemical Decontamination

Biological Decontamination

Radiological/Nuclear Decontamination

Personal Protective Equipment (PPE)

Psychological First Aid and Post-Disaster Support

Psychological Impact of Disasters

Psychological First Aid (PFA)

Healthcare Worker Support

Indigenous Community Support

Australian and New Zealand Disaster Preparedness

ANZICS Disaster Response Framework

State Emergency Services Coordination

Bushfire Response (Black Saturday Lessons)

Cyclone and Flood Response

Earthquake Preparedness (Christchurch 2011)

Volcanic Eruption Response (Whakaari/White Island 2019)

Pandemic ICU Surge (COVID-19 Lessons)

Pacific Island Disaster Partnerships

Communication Systems and Incident Command

MIMMS (Major Incident Medical Management and Support)

CSCATTT (Mnemonic for Scene Organization)

Hospital Incident Management System (HIMS)

Assessment Content

SAQ Practice Question 1: Disaster Triage and Ethical Frameworks (15 marks)

SAQ Practice Question 2: Disaster Response and Surge Capacity (15 marks)

Viva Scenario 1: Pandemic ICU Surge and Allocation (20 marks)

Viva Scenario 2: Chemical Disaster and Decontamination (20 marks)

References

Summary

Learning map

Prerequisites