ICU Outreach and Rapid Response Systems

1. Quick Answer

ICU Outreach and Rapid Response Systems (RRS) comprise organized hospital-wide approaches to detect and respond to deteriorating patients before cardiac arrest or ICU admission. The system has two key components: the afferent limb (detection via early warning scores and calling criteria) and the efferent limb (response by Medical Emergency Team or Critical Care Outreach).

Key Clinical Features:

• Early warning scores (NEWS2, MEWS) standardize deterioration detection
• MET activation criteria define objective calling thresholds
• ICU liaison nurses provide post-discharge ward support
• Family-activated MET enables patient/family escalation

Essential Components:

1. Afferent limb: Monitoring, track-and-trigger systems, escalation protocols
2. Efferent limb: MET/RRT composition, response time, intervention capability
3. Administrative limb: Governance, audit, quality improvement

ICU Mortality for MET-Reviewed Patients: 15-25% (higher if afferent limb failure)

Must-Know Facts:

• MERIT trial (2005) was neutral but methodologically limited
• Meta-analyses show 30-35% reduction in cardiac arrests
• Afferent limb failure accounts for 30-50% of preventable deterioration deaths
• NEWS2 threshold >=5 requires urgent clinical review

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2. CICM Exam Focus

What Examiners Expect

Second Part Written (SAQ):

Common SAQ stems:

• "Outline the components of a Rapid Response System (RRS). Discuss the evidence for its effectiveness."
• "A ward patient meets MET criteria but no MET call is made. The patient subsequently arrests. Discuss the factors contributing to 'afferent limb failure' and strategies to prevent it."
• "Describe the role of the ICU liaison nurse and the evidence for ICU outreach services."
• "Your hospital is implementing a family-activated MET system. Discuss the evidence and implementation considerations."
• "Compare and contrast early warning scores used in Australian hospitals."

Expected depth:

• Definition of RRS components (afferent, efferent, administrative limbs)
• Knowledge of MERIT trial and subsequent meta-analyses
• Understanding of NEWS2 parameters and thresholds
• MET activation criteria and their physiological basis
• Barriers to MET activation (human factors, hierarchy)
• ICU admission criteria vs ward management decision-making
• Family-activated MET (Ryan's Rule) implementation

Second Part Hot Case:

Typical presentations:

• Ward patient reviewed by MET, now admitted to ICU
• Post-ICU discharge patient with recurrent deterioration
• Patient with delayed MET activation and poor outcome

Examiners assess:

• Systematic approach to acute deterioration
• Recognition of reversible causes
• Clear escalation and communication
• ICU admission decision-making rationale
• Family communication regarding prognosis

Second Part Viva:

Expected discussion areas:

• MERIT trial: methodology, results, limitations, interpretation
• Early warning scores: comparison, thresholds, evidence base
• Afferent limb failure: causes, prevention strategies
• ICU liaison nurse role and evidence
• Family-activated MET: Ryan's Rule, Martha's Rule
• Indigenous health considerations in RRS
• Quality improvement and audit of RRS

Examiner expectations:

• Consultant-level understanding of RRS governance
• Ability to critique evidence (MERIT trial limitations)
• Practical implementation knowledge
• Cultural safety awareness

Common Mistakes

• Citing MERIT as evidence that RRS doesn't work (ignoring methodological limitations)
• Not knowing specific NEWS2 parameters and thresholds
• Inability to define afferent vs efferent limb
• Poor understanding of MET activation criteria rationale
• Ignoring human factors in afferent limb failure

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3. Key Points

Must-Know Facts

1. Rapid Response System (RRS) Definition: A hospital-wide system comprising an afferent limb (detection and triggering), efferent limb (response team), and administrative limb (governance and improvement). PMID: 16625125

2. MERIT Trial (2005): Cluster RCT of 23 Australian hospitals showed no significant reduction in composite outcome (cardiac arrest, unplanned ICU admission, unexpected death). Neutral result attributed to contamination, implementation challenges, and afferent limb failure. PMID: 15964445

3. Meta-Analysis Evidence: Despite MERIT, meta-analyses demonstrate 30-35% reduction in cardiac arrests and 12-15% reduction in hospital mortality with RRS implementation. PMID: 20028509

4. Afferent Limb Failure: Documented deterioration meeting MET criteria without activation occurs in 30-50% of adverse events. Three components: failure to monitor, failure to recognize, failure to escalate. PMID: 26034155

5. NEWS2 Thresholds: Score >=5 (or rise >=3 points) requires urgent clinical review; >=7 requires emergency response (MET call equivalent). AUROC 0.89 for 24-hour mortality prediction. PMID: 30853406

6. ICU Liaison Nurse: Specialized role providing post-ICU discharge follow-up, ward staff education, and early deterioration detection. Mixed evidence for mortality reduction but improves transition safety. PMID: 15606509

7. Family-Activated MET: Ryan's Rule (Queensland) and similar programs allow families to escalate concerns directly. Low utilization (<5% of calls) but high clinical yield when used. PMID: 23425539

8. MET Activation Criteria: Standardized physiological triggers including airway threat, respiratory rate <8 or >25, SpO2 <90% on oxygen, systolic BP <90, heart rate <40 or >130, acute change in consciousness, or serious staff concern.

9. ICU Admission Criteria: Decision based on reversibility, illness severity, functional reserve, patient preferences, and resource availability. MET review facilitates goals-of-care discussions in 20-30% of cases.

10. Australian Context: RRS mandatory in most Australian hospitals since 2010 (National Safety and Quality Health Service Standards). ANZICS-CORE provides benchmarking data.

Memory Aids

Mnemonic: AFFERENT FAILURE

• Awareness lacking (staff unaware of criteria)
• Fear of criticism (hierarchical barriers)
• Frequency of monitoring inadequate
• Education gaps (recognizing deterioration)
• Reluctance to escalate ("I might be wrong")
• Equipment barriers (documentation systems)
• Normalization ("always like this")
• Time pressures (competing ward demands)

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4. Definition and Epidemiology

Definition

Rapid Response System (RRS) is defined as a hospital-wide patient safety system designed to identify and respond to deteriorating patients in a timely manner, thereby preventing cardiac arrest, unplanned ICU admission, and unexpected death. PMID: 16625125

Key Components:

Related Terms:

• Medical Emergency Team (MET): Australian/NZ term for rapid response team
• Rapid Response Team (RRT): North American term
• Critical Care Outreach Team (CCOT): UK model emphasizing proactive ward rounding
• ICU Outreach: Services extending ICU expertise to ward patients
• ICU Liaison Nurse: Nurse-led post-ICU discharge follow-up

Epidemiology

International Data:

• MET call rate: 5-15 calls per 1,000 hospital admissions
• Cardiac arrest rate reduction: 30-35% following RRS implementation PMID: 20028509
• Unexpected death rate: 1-3 per 1,000 admissions pre-RRS
• ICU admission from MET: 25-40% of MET-reviewed patients

Australian/NZ Data (ANZICS APD):

• MET services: Mandatory in accredited hospitals since 2010
• Average MET call rate: 8-12 per 1,000 admissions
• ICU admission following MET: 30-35%
• MET-reviewed patient mortality: 15-25%
• Afferent limb failure prevalence: 30-50% of adverse events PMID: 21901141

Risk Factors for Deterioration:

• Non-modifiable: Advanced age, comorbidity burden, frailty
• Modifiable: Post-operative status, infection, medication effects
• Iatrogenic: Sedation, opioids, fluid imbalance

High-Risk Populations:

• Aboriginal and Torres Strait Islander peoples: 2-3x higher rates of sepsis and critical illness
• Maori: Similar disparities in acute deterioration
• Remote/rural populations: Delayed recognition, limited on-site expertise
• Immunocompromised patients: Atypical presentation of deterioration

Outcomes Following MET Review:

• ICU admission: 25-40%
• Ward stabilization: 40-50%
• Goals-of-care discussion/DNAR: 15-25%
• Cardiac arrest within 24 hours: <5% (vs 10-15% without MET)

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5. Applied Basic Sciences

Physiology of Deterioration

Compensatory Mechanisms:

The body's response to physiological stress follows a predictable pattern that early warning systems exploit:

1. Tachycardia: Early compensation for reduced stroke volume or increased metabolic demand
2. Tachypnea: Response to hypoxemia, metabolic acidosis, or increased CO2 production
3. Blood Pressure Maintenance: Initially preserved through increased SVR until decompensation
4. Altered Consciousness: Late sign indicating cerebral hypoperfusion or metabolic derangement

Physiological Cascade of Deterioration:

Initial Insult (Sepsis, PE, MI, Hemorrhage)
           ↓
Compensated Shock (Tachycardia, Vasoconstriction)
           ↓
Early Decompensation (Hypotension, Oliguria)
           ↓
Organ Dysfunction (Confusion, Lactic Acidosis)
           ↓
Cardiac Arrest (Asystole, PEA, VF/VT)

The "Golden Hour" Before Arrest:

Studies demonstrate that 60-80% of patients who suffer unexpected cardiac arrest have documented physiological abnormalities 6-8 hours prior. PMID: 7908792

Key predictive signs (6-8 hours pre-arrest):

• Respiratory rate abnormality: Present in 54% of patients
• Heart rate abnormality: Present in 50%
• Blood pressure abnormality: Present in 35%
• Altered consciousness: Present in 40%

Pathophysiology of Afferent Limb Failure

Cognitive Factors:

1. Anchoring Bias: "The patient is always tachycardic"
2. Confirmation Bias: Seeking information that confirms initial assessment
3. Normalization of Deviance: Accepting abnormal values as normal for that patient
4. Alarm Fatigue: Desensitization to frequent electronic alerts

Human Factors:

Organizational Factors:

• Staffing ratios affecting monitoring frequency
• Documentation systems not highlighting trends
• Ward culture not supporting escalation
• Lack of feedback on appropriate MET calls

Pharmacology of Acute Stabilization

Drugs Used by MET Teams:

Adrenaline (Epinephrine):

• Indication: Cardiac arrest, anaphylaxis, severe hypotension
• MET Dose: 10-100 mcg IV boluses (non-arrest); 1 mg IV (arrest)
• Mechanism: Alpha-1 and beta-1 agonist
• Monitoring: Continuous ECG, BP, response

Metaraminol:

• Indication: Hypotension with adequate fluid status
• MET Dose: 0.5-2 mg IV boluses
• Mechanism: Alpha-1 agonist with some beta activity
• Monitoring: BP, HR, peripheral perfusion

Salbutamol:

• Indication: Bronchospasm, severe asthma
• MET Dose: 5-10 mg nebulized or 100-200 mcg IV
• Mechanism: Beta-2 agonist
• Monitoring: HR, oxygen saturation, response

Naloxone:

• Indication: Opioid-induced respiratory depression
• MET Dose: 40-400 mcg IV, titrated
• Mechanism: Competitive opioid receptor antagonist
• Monitoring: Respiratory rate, consciousness, duration of effect

Flumazenil:

• Indication: Benzodiazepine-induced oversedation
• MET Dose: 200 mcg IV, repeat to 1 mg
• Mechanism: GABA-A receptor antagonist
• Caution: Seizure risk in chronic benzodiazepine users

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6. Clinical Presentation

Triggers for MET Activation

Standardized Australian MET Calling Criteria:

NEWS2 Parameters (National Early Warning Score 2):

NEWS2 Thresholds:

• Score 0-4: Routine monitoring (minimum 12-hourly)
• Score 5-6 or single parameter 3: Urgent clinical review (hourly monitoring)
• Score >=7: Emergency response - MET call

MEWS (Modified Early Warning Score): Older scoring system still used in some centers, using similar parameters with different weightings.

Patterns of Deterioration

Respiratory Failure Pattern:

• Increasing respiratory rate (earliest sign)
• Falling SpO2 despite oxygen escalation
• Accessory muscle use, inability to speak in sentences
• Rising EtCO2 or falling EtCO2 (fatigue)

Circulatory Failure Pattern:

• Rising heart rate (tachycardia often precedes hypotension by hours)
• Falling blood pressure
• Decreasing urine output
• Rising lactate, increasing base deficit

Neurological Deterioration Pattern:

• Agitation or confusion (early sign)
• Decreasing GCS
• New focal neurology
• Seizure activity

Sepsis Pattern:

• Temperature abnormality (fever OR hypothermia)
• Tachycardia + tachypnea
• Hypotension (may be late)
• Confusion, oliguria

Differential Diagnosis

When MET is called, systematic assessment required:

ABCDE Assessment:

• A: Airway obstruction, aspiration, angioedema
• B: Pneumonia, PE, asthma/COPD exacerbation, pneumothorax, ARDS
• C: Sepsis, hypovolemia, cardiogenic shock, arrhythmia, MI, tamponade
• D: Stroke, seizure, hypoglycemia, opioid toxicity, septic encephalopathy
• E: Electrolyte derangement, medication effect, anaphylaxis

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7. Investigations

Bedside Investigations

Arterial Blood Gas (ABG):

• Respiratory failure assessment (PaO2, PaCO2)
• Metabolic status (pH, bicarbonate, base excess)
• Lactate (perfusion marker)
• Hemoglobin (anemia, hemorrhage)
• Electrolytes (rapid K+, Ca2+)

Typical MET patient ABG patterns:

• Type 1 RF: Low PaO2, low/normal PaCO2
• Type 2 RF: Low PaO2, elevated PaCO2
• Shock: Metabolic acidosis, elevated lactate
• Sepsis: Respiratory alkalosis progressing to metabolic acidosis

Point-of-Care Testing:

• Blood glucose (hypoglycemia common cause of altered consciousness)
• Venous blood gas (if arterial not immediately available)
• Troponin (if cardiac concern)

ECG:

• Arrhythmia detection
• Ischemia/infarction
• Electrolyte effects (peaked T waves, QT prolongation)
• Pulmonary embolism (S1Q3T3, right heart strain)

Laboratory Investigations

Urgent Blood Tests:

• FBC: Hemoglobin, WCC (infection/sepsis), platelets
• UEC: Acute kidney injury, hyperkalemia
• LFTs: Hepatic dysfunction
• Coagulation: DIC screen if septic
• CRP/Procalcitonin: Infection markers
• Blood cultures: Sepsis investigation (before antibiotics if possible)

Imaging

Chest X-Ray:

• Pneumonia, pulmonary edema
• Pneumothorax, effusion
• ETT/line position if intubated/lines inserted

Echocardiography:

• Cardiac function assessment
• Tamponade, right heart strain
• Volume status

CT as Indicated:

• CT Head: Stroke, hemorrhage
• CTPA: Pulmonary embolism
• CT Abdomen: Intra-abdominal sepsis

Monitoring Decisions

Ward vs ICU Monitoring:

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8. ICU Management

MET Response Protocol

Immediate Actions (First 5 Minutes):

A - Airway:

• Assess patency and protection
• Position (recovery position, sit upright)
• Suction if required
• Call for airway support if compromised
• Prepare for intubation if GCS <8 or not protecting airway

B - Breathing:

• Apply high-flow oxygen (target SpO2 94-98%, or 88-92% if COPD)
• Assess work of breathing, auscultate
• Consider NIV if appropriate
• Prepare for intubation if failing

C - Circulation:

• IV access (large bore if not present)
• Fluid bolus 250-500 mL crystalloid if hypotensive
• Metaraminol 0.5-2 mg if hypotensive with adequate filling
• ECG, prepare for arrest if concerns

D - Disability:

• Check glucose (treat hypoglycemia immediately)
• Assess GCS, pupils
• Naloxone if opioid toxicity suspected
• Review medication chart

E - Exposure:

• Temperature, examine for source
• Review charts, recent investigations
• Check drug chart, recent changes
• Speak to nursing staff for history

ICU Admission Decision-Making

Indications for ICU Admission:

1. Organ Support Required:

   • Invasive mechanical ventilation
   • Vasopressor/inotrope infusion
   • Renal replacement therapy
   • Advanced hemodynamic monitoring

2. High-Risk Condition Requiring ICU Monitoring:

   • Post-cardiac arrest
   • Severe sepsis requiring hourly reassessment
   • High-risk arrhythmia
   • DKA/HHS requiring intensive monitoring

3. Ongoing Instability:

   • Not responding to initial resuscitation
   • Escalating organ support needs
   • Requires 1:1 nursing beyond ward capability

Factors Supporting Ward Management:

1. Response to Initial Treatment:

   • Vital signs improving with intervention
   • Single organ system involvement
   • Cause identified and addressed

2. Patient Factors:

   • Advance care directive limiting escalation
   • Goals-of-care discussion favoring comfort measures
   • Pre-existing functional limitations

3. Resource Factors:

   • Ward-based high-dependency area available
   • Adequate nursing ratios for increased monitoring
   • Clear escalation pathway if deteriorates

ANZICS Statement on ICU Admission:

Decisions should consider:

• Likelihood of benefit from ICU admission
• Reversibility of the acute condition
• Patient's premorbid functional status
• Patient's wishes and values
• Resource availability

ICU Liaison Nurse Role

Core Functions:

1. Post-ICU Discharge Follow-up:

   • Review patients within 24-48 hours of ICU discharge
   • Identify those at risk of readmission
   • Liaise with ward staff regarding care plans

2. Ward Staff Education:

   • Just-in-time teaching on tracheostomy care, wound management
   • Early warning score interpretation
   • When and how to escalate

3. Early Deterioration Detection:

   • Proactive rounding on high-risk patients
   • Review recently discharged ICU patients
   • Identify "at-risk" patients not yet meeting MET criteria

4. Family Support:

   • Point of contact for families during transition
   • Explain difference in care levels between ICU and ward
   • Address concerns about "abandonment"

Evidence Base (PMID: 15606509):

• Reduces adverse events in recently discharged ICU patients
• May reduce ICU readmission rates (variable evidence)
• High ward staff satisfaction
• Cost-effectiveness suggested but not definitively proven

Goals-of-Care Discussions

MET as Trigger for Goals-of-Care:

Research shows 15-25% of MET calls result in goals-of-care discussions rather than ICU admission. PMID: 21901141

Indications for Goals-of-Care Discussion During MET:

• Patient with advanced illness experiencing expected deterioration
• Multiple MET calls without improvement
• Patient/family expressing treatment limitations
• Clinician concern about appropriateness of escalation

Approach:

1. Stabilize acute emergency first
2. Gather information (diagnosis, prognosis, prior discussions)
3. Identify decision-makers (patient if capable, otherwise SDM)
4. Explore patient values and preferences
5. Make recommendation aligned with values
6. Document clearly in medical record

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9. Monitoring and Complications

Quality Indicators for RRS

Process Measures:

• MET call rate per 1,000 admissions
• Time from meeting criteria to MET activation
• MET response time (call to arrival)
• Proportion of MET calls resulting in ICU admission
• Proportion of cardiac arrests with prior MET review

Outcome Measures:

• Cardiac arrest rate per 1,000 admissions
• Unexpected death rate
• ICU readmission rate within 48-72 hours
• Hospital mortality rate (risk-adjusted)

Balancing Measures:

• False positive MET calls
• Ward staff workload impact
• ICU workload from MET-related admissions

Complications of RRS

System Complications:

Patient Complications:

Afferent Limb Failure Outcomes:

• Associated with 2-3x increased mortality PMID: 26034155
• Delayed intervention leads to worse outcomes
• May result in preventable cardiac arrest

Efferent Limb Failure:

• Delayed response (>15 minutes) associated with worse outcomes
• Inadequate stabilization before ICU transfer
• Poor handover leading to treatment gaps

Audit and Improvement

Regular Review Required:

• All cardiac arrests: Was MET called? Were criteria met earlier?
• All unexpected deaths: Was there documented deterioration?
• MET call appropriateness: Random sampling of calls
• Near-miss events: Identified through voluntary reporting

Root Cause Analysis: When adverse events occur, examine:

• Monitoring frequency and accuracy
• Recognition of abnormal values
• Escalation pathway adherence
• Response team performance
• System factors (staffing, equipment, culture)

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10. Prognosis and Outcome Measures

Mortality

Short-Term Outcomes:

• MET-reviewed patients: 15-25% hospital mortality
• Cardiac arrest rate reduction post-RRS: 30-35% PMID: 20028509
• Hospital mortality reduction: 12-15% (meta-analysis data)

Long-Term Outcomes:

• 90-day mortality: 20-30% for MET-reviewed patients
• ICU readmission within 48 h: 5-10% of ICU discharges
• Functional recovery: Variable based on underlying condition

Prognostic Factors

Good Prognostic Factors:

• Rapid response to MET intervention
• Single organ dysfunction
• Reversible cause identified
• Preserved baseline function

Poor Prognostic Factors:

• Multiple MET calls without improvement
• Multi-organ dysfunction at MET review
• Delayed activation (afferent limb failure)
• Advanced comorbidities
• Frailty

Scoring Systems

NEWS2 Predictive Value:

• AUROC 0.89 for 24-hour mortality PMID: 30853406
• AUROC 0.84 for ICU admission within 24 hours
• Score >=7: 30-day mortality approximately 20%

Risk Stratification:

Australian/NZ Outcome Data

ANZICS-CORE Data:

• RRS implementation widespread since 2010
• Cardiac arrest rates have declined nationally
• ICU admission patterns shifted (earlier, less severe)
• Benchmarking available for MET call rates

Indigenous Health Outcomes:

• Higher rates of delayed presentation
• Cultural barriers to escalation
• Language barriers affecting communication
• Need for Aboriginal Health Worker/Liaison Officer involvement
• Maori: Similar disparities, need for whanau involvement

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11. Progressive Difficulty Assessments

Basic Level (Foundation Knowledge)

Question 1: Definition

Q: Define a Rapid Response System and list its three components.

A: A Rapid Response System (RRS) is a hospital-wide patient safety system designed to identify and respond to deteriorating patients before cardiac arrest, unplanned ICU admission, or unexpected death.

Three components:

1. Afferent Limb: Detection mechanisms (early warning scores, calling criteria, escalation protocols)
2. Efferent Limb: Response capability (MET team, interventions, stabilization)
3. Administrative Limb: Governance (data collection, audit, education, quality improvement)

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Question 2: MET Calling Criteria

Q: List 5 standard MET calling criteria used in Australian hospitals.

A:

1. Threatened airway
2. Respiratory rate <8 or >25 breaths/min
3. SpO2 <90% despite supplemental oxygen
4. Systolic blood pressure <90 mmHg
5. Heart rate <40 or >130 beats/min
6. Acute change in consciousness (GCS drop >=2 or new confusion)
7. Serious staff concern ("I'm worried about this patient")

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Question 3: NEWS2 Parameters

Q: List the 7 parameters measured in the NEWS2 early warning score.

A:

1. Respiratory rate
2. Oxygen saturation (SpO2)
3. Supplemental oxygen (air vs oxygen)
4. Systolic blood pressure
5. Heart rate
6. Level of consciousness (ACVPU scale)
7. Temperature

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Intermediate Level (Applied Knowledge)

Question 1: Case-Based Scenario

Stem: A 72-year-old man is 3 days post-laparotomy for bowel obstruction. Ward nurse notes: HR 110, BP 95/60, RR 26, SpO2 93% on 4L O2, temperature 38.2C, drowsy but rousable.

Q1: Calculate the NEWS2 score and state the required response. (4 marks)

A1:

• Respiratory rate 26: Score 3
• SpO2 93% on O2: Score 3 (using Scale 1 + oxygen)
• Supplemental oxygen: Score 2
• Systolic BP 95: Score 2
• Heart rate 110: Score 2
• Consciousness (drowsy = CVPU): Score 3
• Temperature 38.2: Score 1

Total NEWS2 = 16

Required response: Emergency response - immediate MET call (score >=7)

Q2: What is the most likely diagnosis and what initial investigations would you perform? (4 marks)

A2: Most likely diagnosis: Post-operative sepsis (anastomotic leak until proven otherwise)

Initial investigations:

• ABG with lactate
• FBC, UEC, LFTs, CRP, procalcitonin
• Blood cultures x 2 sets
• Chest X-ray
• Urinalysis and culture
• CT abdomen with contrast if source not clear

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Question 2: Afferent Limb Failure

Q: A 55-year-old woman has nursing observations documented as HR 125, RR 28, BP 85/50 at 0600. MET was not called. At 1000 she has a cardiac arrest. Describe the factors that may have contributed to afferent limb failure. (6 marks)

A:

Failure to Monitor (1 mark):

• Observations may not have been taken at appropriate frequency
• Trends may not have been plotted to show deterioration pattern

Failure to Recognize (2 marks):

• Staff may not have recognized values as abnormal
• Alarm fatigue or normalization ("she's always tachycardic")
• Lack of training on calling criteria
• Electronic system may not have flagged appropriately

Failure to Escalate (3 marks):

• Hierarchical barriers (waiting for doctor's permission)
• Fear of criticism from MET team
• Uncertainty about calling criteria
• Cultural barriers ("don't want to bother the MET team")
• Competing ward priorities
• Lack of empowerment to activate MET

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Exam Level (CICM Second Part Standard)

Question 1: Evidence Base

Q: Discuss the evidence for and against Rapid Response Systems in reducing hospital mortality, with reference to the MERIT trial and subsequent meta-analyses. (8 marks)

A:

MERIT Trial (2005) - PMID: 15964445 (3 marks):

• Cluster RCT of 23 Australian hospitals
• Intervention: MET system implementation
• Primary outcome: Composite of cardiac arrest, unplanned ICU admission, unexpected death
• Result: No significant difference between intervention and control hospitals
• Limitations:
  • Contamination (control hospitals improved their own systems)
  • Afferent limb failure (many patients meeting criteria not called)
  • Implementation variability
  • Study may have been underpowered

Subsequent Meta-Analyses (3 marks):

• Chan 2010 (PMID: 20028509): 17 studies, significant reduction in cardiac arrests (RR 0.65) and hospital mortality (RR 0.88)
• Maharaj 2015: Similar findings with 30-35% cardiac arrest reduction
• Cochrane Review 2020: Low-to-moderate quality evidence supports RRS for cardiac arrest reduction

Resolution of Paradox (2 marks):

• MERIT had methodological limitations
• Meta-analyses include observational data showing real-world benefit
• "Dose-response" relationship: Better implementation = better outcomes
• Current consensus: RRS effective when properly implemented
• Focus should be on optimizing afferent limb (detection and activation)

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12. SAQ Practice

SAQ 1: Rapid Response System Components

Time Allocation: 10 minutes
Total Marks: 20

Stem: Your hospital has experienced two unexpected cardiac arrests on general wards in the past month. Review reveals that both patients had documented vital sign abnormalities hours before their arrests, but the Medical Emergency Team (MET) was not called.

Question 1.1 (8 marks)

Describe the components of a Rapid Response System and outline the concept of "afferent limb failure."

Model Answer:

Components of Rapid Response System (4 marks):

Afferent Limb (1.5 marks):

• Detection mechanisms: vital sign monitoring, early warning scores (NEWS2, MEWS)
• Track-and-trigger systems: automated alerts when thresholds reached
• Escalation protocols: clear pathway for calling MET
• Calling criteria: standardized physiological thresholds

Efferent Limb (1.5 marks):

• Response team composition: doctor, nurse, +/- respiratory therapist
• Response time targets: typically <5-10 minutes
• Intervention capability: resuscitation, stabilization
• Decision-making: ward management vs ICU admission

Administrative Limb (1 mark):

• Governance structure
• Data collection and audit
• Education and training
• Quality improvement processes
• Feedback mechanisms

Afferent Limb Failure (4 marks):

Definition: Documented patient deterioration meeting MET criteria without MET activation

Three components of failure:

Failure to Monitor (1 mark):

• Inadequate frequency of observations
• Inaccurate measurement
• Failure to document

Failure to Recognize (1.5 marks):

• Not interpreting abnormal values as significant
• Normalization of deviance
• Alarm fatigue
• Lack of training

Failure to Escalate (1.5 marks):

• Hierarchical barriers
• Fear of criticism
• Cultural factors
• Competing demands
• Lack of empowerment

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Question 1.2 (6 marks)

Outline strategies to reduce afferent limb failure in your hospital.

Model Answer:

Education and Training (2 marks):

• Mandatory training on MET calling criteria
• Simulation exercises for ward staff
• Regular feedback on MET call appropriateness
• Case reviews of missed deterioration

System Improvements (2 marks):

• Electronic early warning score calculation with automatic alerts
• Escalation protocols embedded in observation charts
• Clear visual displays of calling criteria at bedside
• Time-based monitoring requirements based on NEWS2 score

Cultural Change (2 marks):

• Empower all staff to activate MET ("anyone can call")
• Positive reinforcement for appropriate calls
• Remove hierarchical barriers
• "Worried" criterion legitimizes clinical intuition
• Non-punitive response to calls that don't result in escalation
• Family-activated MET (Ryan's Rule) as safety net

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Question 1.3 (6 marks)

What outcome measures would you use to evaluate the effectiveness of changes to your Rapid Response System?

Model Answer:

Process Measures (2 marks):

• MET call rate per 1,000 admissions
• Time from meeting criteria to MET activation
• Proportion of cardiac arrests with prior MET review
• Afferent limb failure rate (% of adverse events with documented prior abnormality without MET call)

Outcome Measures (2 marks):

• Cardiac arrest rate per 1,000 admissions
• Unexpected death rate
• ICU readmission rate within 48 hours
• Hospital mortality (risk-adjusted)

Balancing Measures (1 mark):

• MET team workload
• Ward staff satisfaction
• False positive MET call rate

Feedback and Learning (1 mark):

• Case reviews for all cardiac arrests and unexpected deaths
• Regular reporting to ward staff and leadership
• Benchmarking against ANZICS-CORE data

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SAQ 2: Family-Activated MET and ICU Liaison

Time Allocation: 10 minutes
Total Marks: 20

Stem: Your hospital is considering implementing a family-activated Medical Emergency Team (MET) system, similar to "Ryan's Rule" used in Queensland.

Question 2.1 (8 marks)

Describe the evidence for family-activated MET systems and discuss the potential benefits and concerns.

Model Answer:

Evidence Base (3 marks):

• Limited RCT evidence but strong qualitative support
• Family-activated calls comprise <5% of total MET calls (low utilization)
• When families do call, clinical urgency often high
• Systematic review (BMJ Qual Saf 2020): valued for detecting deterioration but limited evidence for mortality reduction
• Acts as "safety net" for individual high-risk cases

Benefits (3 marks):

• Families detect subtle changes missed by staff ("soft signs")
• Reduces "failure to rescue" from clinical anchoring
• Empowers families as partners in care
• Increases patient/family satisfaction and psychological safety
• Particularly important for patients with communication barriers

Concerns (2 marks):

• Initial staff concern about being "bypassed"
• Potential for non-clinical calls (rarely occurs in practice)
• Implementation requires education program
• Language and health literacy barriers may limit use
• May widen health equity gaps if not accessible to all

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Question 2.2 (6 marks)

Outline the key components of implementing a family-activated MET system.

Model Answer:

Policy and Protocol (2 marks):

• Clear escalation pathway (e.g., Ryan's Rule: Step 1 - talk to nurse, Step 2 - talk to doctor, Step 3 - call MET directly)
• Dedicated phone number for family calls
• Script for call takers
• Documentation requirements

Education (2 marks):

• Staff education on purpose and process
• Patient/family education at admission (verbal + written)
• Multilingual resources
• Signage in patient areas

Implementation Support (2 marks):

• Cultural safety considerations (Aboriginal Health Workers, interpreters)
• Bedside information cards
• Promotional campaign
• Staff champions on each ward
• Regular audit and feedback

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Question 2.3 (6 marks)

Describe the role of the ICU Liaison Nurse and the evidence supporting this service.

Model Answer:

Core Functions (3 marks):

Post-ICU Follow-up (1 mark):

• Review patients 24-72 hours post-ICU discharge
• Identify high-risk patients for readmission
• Facilitate goals-of-care discussions

Ward Staff Support (1 mark):

• Education on complex care (tracheostomy, wound care)
• Early warning score interpretation
• When and how to escalate

Early Deterioration Detection (1 mark):

• Proactive rounding on high-risk patients
• Acts as extension of ICU expertise to wards
• Family support during ICU-to-ward transition

Evidence Base (3 marks):

Studies (PMID: 15606509, 15333067):

• Reduces adverse events in recently discharged ICU patients
• Variable evidence for ICU readmission reduction
• High ward staff satisfaction
• Improves communication and handover

Limitations:

• Difficult to isolate effect from overall RRS
• No definitive mortality benefit as standalone intervention
• Most effective when integrated with MET system

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13. Hot Case Scenarios

Hot Case 1: Post-ICU Discharge Deterioration

Setting: ICU Bed 8
Duration: 20 minutes (10 min assessment + 10 min discussion)

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Actor/Simulator Briefing (Not given to candidate):

Patient Details:

• Age: 68 years
• Gender: Male
• Admission diagnosis: Community-acquired pneumonia with Type 1 respiratory failure
• Original ICU stay: 5 days (NIV support, no intubation)
• Discharged to ward: 48 hours ago
• Re-admitted to ICU: MET call 2 hours ago for worsening dyspnea

History:

• Progressive dyspnea over past 12 hours on ward
• Nursing notes document RR 26-28, SpO2 dropping to 88% on 6L O2
• MET called when SpO2 dropped to 82% despite 10L O2

Current Status:

• On high-flow nasal cannula (HFNC) 50L/min, FiO2 0.6
• SpO2 92%
• Alert and oriented but anxious

Examination Findings:

• General: Sitting upright, moderate respiratory distress
• Airway: Speaking in short sentences
• Breathing: RR 28, accessory muscle use, bilateral crackles worse than baseline
• Circulation: HR 105 regular, BP 135/80, warm peripheries
• Disability: GCS 15, moving all limbs
• Exposure: T 37.4C, no new rashes, surgical sites clean

Charts/Data Available:

• NEWS2 on ward: 4 yesterday, 7 this morning, 10 at MET call
• ABG (current): pH 7.38, PaCO2 38, PaO2 72 (FiO2 0.6), lactate 1.2
• CXR: Increased bilateral infiltrates compared to discharge
• Bloods: WCC 14.5, CRP 95 (was 45 at discharge)

Current Management:

• HFNC 50L, FiO2 0.6
• IV Augmentin + Azithromycin (continued from ward)
• IV fluids maintenance

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Expected Performance:

Assessment Phase (10 minutes) - 15 marks

History (3 marks):

• Ask nurse about timeline of deterioration
• Review original ICU admission and discharge summary
• Check for new symptoms (sputum, fever)
• Medication compliance
• Goals-of-care discussions during original admission

Examination (10 marks):

• Systematic A-E approach
• Assess work of breathing, auscultation
• Compare to ICU discharge examination
• Check for new findings (DVT, cardiac failure)
• Review charts and trends

One-Minute Summary (2 marks): "This is a 68-year-old man readmitted to ICU 48 hours after discharge for CAP. He has progressive hypoxic respiratory failure, now on HFNC with persistent tachypnea and hypoxemia. CXR shows increased infiltrates and inflammatory markers rising. Differential includes deteriorating CAP, hospital-acquired infection, pulmonary embolism, or cardiac failure. He appears at risk of requiring intubation if trajectory continues."

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Discussion Phase (10 minutes) - 15 marks

Opening Question: "What are your management priorities for the next 6 hours?"

Expected Answer (3 marks):

1. Optimize respiratory support - consider escalation to NIV/CPAP or intubation if HFNC fails
2. Investigate cause of deterioration - CTPA to exclude PE, echo if cardiac concerns
3. Broaden antimicrobial cover - consider hospital-acquired pathogens, atypical organisms
4. Set clear parameters for intubation (SpO2 target, respiratory fatigue)

Q1: "When would you intubate this patient?" (3 marks)

Expected Answer:

• Worsening hypoxemia (SpO2 <88% despite maximal HFNC)
• Rising PaCO2 indicating fatigue
• Accessory muscle fatigue, paradoxical breathing
• Declining conscious level
• Hemodynamic instability

Q2: "The patient was discharged 48 hours ago. How could this readmission have been prevented?" (3 marks)

Expected Answer:

• ICU liaison nurse follow-up within 24 hours
• Clear discharge criteria (stable observations for 24h)
• Ward education on escalation
• Lower threshold for MET review in recently discharged ICU patients
• Consideration of step-down/HDU rather than direct to ward

Q3: "How would you audit your ICU's readmission rates?" (3 marks)

Expected Answer:

• Track 48-hour and 7-day readmission rates
• Review each readmission (was it preventable?)
• Compare to ANZICS-CORE benchmarks
• Identify risk factors for readmission
• Feedback to improve discharge planning and liaison services

Q4: "What are the cultural considerations if this patient were Aboriginal or Torres Strait Islander?" (3 marks)

Expected Answer:

• Involve Aboriginal Health Worker/Liaison Officer
• Include family in discussions (may be extended family)
• Allow time for family meetings
• Cultural protocols for dying if prognosis poor
• Interpreter services if required
• Consider Sorry business protocols if outcome poor

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Hot Case 2: Afferent Limb Failure

Setting: ICU Bed 3
Duration: 20 minutes

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Scenario: 55-year-old woman admitted to ICU post-cardiac arrest. She is 3 days post-laparotomy for perforated diverticulitis. Ward observations documented: HR 115-125, RR 24-28, BP 95-100 systolic, SpO2 94% on 4L O2 for 6 hours prior to arrest. MET was not called.

Focus Areas:

• Post-arrest assessment and management
• Targeted temperature management
• Neuroprognostication
• Analysis of afferent limb failure
• System improvement recommendations

Key Discussion Points:

• Why was MET not called despite meeting criteria?
• How would you investigate this as a quality concern?
• What systemic changes would you recommend?
• How would you communicate with family about the delay?
• Open disclosure requirements

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14. Viva Questions

Viva Question 1: MERIT Trial and Evidence

Stem: "A colleague states that the MERIT trial proved Rapid Response Systems don't work. Discuss this statement."

Duration: 12 minutes

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Opening Question: "What were the key findings of the MERIT trial?"

Expected Answer (3 minutes):

• MERIT = Medical Early Response Intervention and Therapy trial
• Published Lancet 2005 (PMID: 15964445)
• Cluster RCT of 23 Australian hospitals
• Intervention: MET system implementation
• Primary outcome: Composite of cardiac arrest, unplanned ICU admission, unexpected death
• Result: No significant difference between intervention and control (p=0.640)

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Follow-up Question 1: "Why might the trial have failed to show benefit?"

Expected Answer (3 minutes):

Contamination:

• Control hospitals improved their own response systems during the study
• Awareness of being studied may have changed practice

Implementation Issues:

• Variable quality of MET implementation
• "Dose-response" effect - poorly implemented MET won't work

Afferent Limb Failure:

• Many patients meeting MET criteria were never called on
• The intervention didn't actually reach many eligible patients

Statistical Power:

• May have been underpowered to detect smaller but clinically significant effects

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Follow-up Question 2: "What does subsequent evidence show?"

Expected Answer (3 minutes):

Meta-Analyses:

• Chan 2010 (PMID: 20028509): 17 studies showed significant reduction in cardiac arrests (RR 0.65) and hospital mortality (RR 0.88)
• Consistent finding: 30-35% reduction in cardiac arrest rates
• 12-15% reduction in hospital mortality

Observational Studies:

• Before-after studies in individual hospitals show large effects
• Real-world implementation associated with benefits

Cochrane Review:

• Low-to-moderate quality evidence
• Balance of evidence supports RRS for cardiac arrest reduction

Current Consensus:

• RRS is effective when properly implemented
• Focus should be on optimizing afferent limb
• Mandated in Australian hospital accreditation since 2010

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Follow-up Question 3: "How would you optimize your hospital's RRS?"

Expected Answer (3 minutes):

Strengthen Afferent Limb:

• Education on calling criteria
• Electronic early warning score alerts
• Empowerment to call ("anyone can call")
• Regular audit of missed deterioration

Optimize Efferent Limb:

• Appropriate team composition
• Response time targets (<5-10 minutes)
• Clear escalation pathways
• ICU admission criteria

Administrative Support:

• Data collection and feedback
• Case reviews of adverse events
• Benchmarking against ANZICS-CORE
• Leadership commitment

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Viva Question 2: ICU Admission Decision-Making

Stem: "You are the ICU registrar called to review a ward patient who has been reviewed by MET. The patient is 78 years old with metastatic lung cancer, now with new pneumonia and requiring 10L oxygen to maintain SpO2 92%. The oncology team is requesting ICU admission."

Duration: 12 minutes

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Opening Question: "What factors would you consider in deciding whether to admit this patient to ICU?"

Expected Answer (4 minutes):

Patient Factors:

• Severity of acute illness (potentially reversible pneumonia)
• Baseline function prior to this illness
• Cancer prognosis (metastatic = limited life expectancy)
• Performance status (ECOG, Karnofsky)
• Comorbidities

Reversibility:

• Is the pneumonia likely to respond to treatment?
• What level of organ support likely required?
• Duration of expected ICU stay

Patient Preferences:

• Any advance care directive?
• Previous discussions about goals of care?
• Patient's values and wishes if able to express

Resource Factors:

• ICU bed availability
• Alternative care settings (HDU, enhanced ward care)
• Nursing ratios on ward

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Follow-up Question 1: "The patient is alert and says she wants 'everything done.' How do you proceed?"

Expected Answer (4 minutes):

Explore What "Everything" Means:

• Does she understand her cancer prognosis?
• Does she understand what ICU admission involves?
• What are her goals (time, comfort, specific events)?

Provide Information:

• Honest prognosis with cancer plus acute illness
• What ICU would look like (intubation, lines, sedation)
• Alternative approaches (aggressive ward care, comfort focus)

Shared Decision-Making:

• Make a recommendation based on medical assessment
• "Given your cancer and this pneumonia, I'm not sure ICU would help you achieve your goals"
• Time-limited trial may be appropriate if uncertainty

Documentation:

• Record discussion clearly
• Involve oncology team
• Consider palliative care input

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Follow-up Question 2: "If you decide not to admit to ICU, what care would you provide?"

Expected Answer (4 minutes):

Ward-Based Care:

• High-flow oxygen therapy
• IV antibiotics
• Regular MET team review
• Clear escalation plan documented

Symptom Management:

• Morphine for dyspnea if distressing
• Anxiolytics if anxious
• Position for comfort

Palliative Care Input:

• Early involvement if prognosis likely short
• Symptom control expertise
• Family support

Communication:

• Clear conversation with family
• Explain reasoning for non-ICU approach
• Emphasize ongoing active treatment for pneumonia
• Set expectations for trajectory

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Viva Question 3: Early Warning Scores

Stem: "Describe the NEWS2 early warning score and its role in detecting clinical deterioration."

Duration: 12 minutes

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Opening Question: "What are the components of NEWS2?"

Expected Answer (3 minutes):

Seven Parameters:

1. Respiratory rate
2. Oxygen saturation (SpO2)
3. Supplemental oxygen requirement
4. Systolic blood pressure
5. Heart rate
6. Level of consciousness (ACVPU)
7. Temperature

Scoring:

• Each parameter scores 0-3 based on deviation from normal
• Aggregate score determines response level
• New confusion scores 3 points

Key Thresholds:

• Score 0-4: Routine monitoring
• Score 5-6 (or single parameter 3): Urgent review
• Score >=7: Emergency response (MET call equivalent)

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Follow-up Question 1: "What is the evidence for NEWS2?"

Expected Answer (3 minutes):

Validation Studies:

• PMID: 30853406: AUROC 0.89 for 24-hour mortality
• AUROC 0.84 for ICU admission within 24 hours
• Better than qSOFA for general ward patients

COVID-19 Validation:

• PMID: 34533967: AUROC 0.82 for ICU admission/death
• Remains valid across different patient populations

UK Implementation:

• Mandated by NHS since 2017
• Standardized approach across all acute hospitals
• Reduces variability in deterioration detection

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Follow-up Question 2: "What are the limitations of early warning scores?"

Expected Answer (3 minutes):

Sensitivity vs Specificity Trade-off:

• Lower thresholds = more alerts, more false positives
• Higher thresholds = fewer alerts, risk of missing deterioration

Patient Populations:

• May underperform in specific populations (children, obstetric)
• COPD patients need modified SpO2 targets (Scale 2)

Human Factors:

• Score calculation doesn't guarantee action
• Afferent limb failure still occurs despite scoring
• Alarm fatigue if too many triggers

Context Matters:

• Single score less valuable than trend
• Clinical judgment still required
• "Worried" criterion remains important

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Follow-up Question 3: "How would you implement NEWS2 in a hospital not currently using it?"

Expected Answer (3 minutes):

Preparation:

• Stakeholder engagement (nursing, medical, management)
• Education program (theory + practical)
• Chart redesign to incorporate NEWS2

Implementation:

• Pilot on selected wards
• Electronic integration if possible
• Clear escalation protocols linked to scores
• Audit and feedback

Sustainability:

• Regular training for new staff
• Ongoing audit of compliance
• Case reviews when deterioration missed
• Celebrate successes

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Viva Question 4: Indigenous Health and RRS

Stem: "How would you adapt a Rapid Response System for a hospital serving a large Aboriginal and Torres Strait Islander population?"

Duration: 12 minutes

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Opening Question: "What challenges might Indigenous patients face in accessing RRS?"

Expected Answer (4 minutes):

Communication Barriers:

• Language differences
• Different communication styles (indirect, less eye contact)
• Health literacy challenges
• Distrust of health system due to historical factors

Cultural Factors:

• Family involvement in decision-making (collective model)
• Gender-specific care preferences
• Reluctance to "complain" or escalate concerns
• Different understanding of illness causation

System Barriers:

• Remote presentations may be more severe
• Delayed presentation to hospital
• May discharge against medical advice if not culturally safe
• Previous negative experiences with healthcare

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Follow-up Question 1: "How would you adapt the family-activated MET system?"

Expected Answer (4 minutes):

Access:

• Materials in Aboriginal languages where appropriate
• Visual/pictorial information
• Verbal explanation in addition to written
• Interpreter services available 24/7

Cultural Safety:

• Involve Aboriginal Health Workers in education
• Train MET team in cultural competence
• Allow extended family to be involved
• Respect for Elders in communication

Implementation:

• Community consultation in design
• Aboriginal Health Worker to accompany MET when possible
• Feedback mechanisms appropriate to community
• Celebrate Indigenous staff contributions

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Follow-up Question 2: "How would you approach goals-of-care discussions with an Aboriginal patient and family?"

Expected Answer (4 minutes):

Preparation:

• Involve Aboriginal Health Worker/Liaison Officer early
• Identify appropriate family members (may be large group)
• Allow adequate time (may need multiple meetings)
• Choose appropriate setting (may prefer outdoors)

Communication:

• Use interpreter if any language concerns
• Avoid medical jargon
• Allow silences (not uncomfortable in some cultures)
• Respect collective decision-making

Cultural Considerations:

• Some topics may be gender-restricted
• Elder authority important
• Connection to Country may be important at end of life
• Sorry business protocols if death expected

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15. Interactive Elements

[INTERACTIVE: NEWS2 Calculator]

Instructions: Enter the patient's vital signs to calculate NEWS2 score and recommended response.

Input Parameters:

• Respiratory Rate: [___] breaths/min
• SpO2: [___] %
• Supplemental Oxygen: [Air/Oxygen]
• COPD/Hypercapnic RF: [Yes/No] (determines Scale 1 or 2)
• Systolic BP: [___] mmHg
• Heart Rate: [___] beats/min
• Consciousness: [Alert/Confusion/Responds to Voice/Responds to Pain/Unresponsive]
• Temperature: [___] C

Output:

• Individual parameter scores
• Aggregate NEWS2 score
• Recommended response level
• Monitoring frequency required

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[INTERACTIVE: MET Criteria Checker]

Instructions: Check if the patient meets MET calling criteria.

Input Parameters:

Output:

• MET call indicated: [Yes/No]
• Criteria met: [List]
• Action required: [Escalation protocol]