Anaesthesia for Radical Neck Dissection

Quick Answer

Exam Essentials - ANZCA Final Examination

Radical Neck Dissection (RND): En bloc removal of lymph node groups I-V, sternocleidomastoid muscle, internal jugular vein, and spinal accessory nerve. Modified RND (MRND): Preserves one or more non-lymphatic structures. Selective neck dissection: Preserves one or more lymph node groups [1-3].

Key Anaesthetic Considerations:

• Airway: May be compromised preoperatively (tumour bulk, radiation fibrosis); difficult intubation common (20-30%); tracheostomy often required (bilateral dissections, extensive surgery) [4,5]
• Carotid sinus reflex: Manipulation of carotid bifurcation → bradycardia, hypotension, asystole; incidence 10-15% [6,7]
• Venous congestion: Bilateral IJV sacrifice → increased ICP, facial/oedema; maintain head elevation, avoid Trendelenburg [8,9]
• Blood loss: 200-800 mL typical; crossmatch 2-4 units [10,11]
• Duration: 4-8 hours for comprehensive neck dissection with free flap reconstruction
• Nerve monitoring: Spinal accessory nerve (CN XI), vagus (CN X), hypoglossal (CN XII) may be monitored; adjust NMBAs accordingly [12,13]

Postoperative Concerns:

• Airway oedema (worse after prolonged surgery, fluid administration, bilateral dissection)
• Accessory nerve palsy → shoulder dysfunction ("shoulder syndrome")
• Chyle leak (thoracic duct injury, left side)
• Carotid artery exposure/rupture [14,15]

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Indigenous Health Considerations

Aboriginal and Torres Strait Islander Populations

Epidemiology of Head and Neck Cancer:

Head and neck squamous cell carcinoma (HNSCC) shows distinct patterns among Aboriginal and Torres Strait Islander populations:

• Higher incidence: 1.5-2 times higher than non-Indigenous Australians, particularly in regional/remote areas [16]
• Younger age at presentation: Median age 55-58 years vs 62-65 years in non-Indigenous [17]
• Advanced stage at diagnosis: 60-70% present with stage III-IV disease vs 40-50% non-Indigenous [18]
• HPV-related oropharyngeal cancer: Lower rates than non-Indigenous (reflecting different risk factor profiles) [19]

Risk Factor Profile:

Barriers to Care:

1. Geographic isolation: Limited head and neck surgical services in regional/remote areas; referral to capital cities required
2. Delayed presentation: Cultural factors, limited health literacy, fear of cancer diagnosis
3. Treatment compliance: Complex 6-8 week chemoradiation regimens difficult for remote patients (accommodation, transport, family separation)
4. Surgical wait times: Public system delays may worsen outcomes
5. Postoperative support: Limited speech pathology, dietetic, physiotherapy services in rural areas [22,23]

Cultural Safety Considerations:

• Aboriginal Health Worker involvement: Essential for communication, navigation, cultural support
• Family involvement: Extended family decision-making; "Sorry Business" may affect treatment timing
• Interpreter services: Language barriers for complex surgical consent discussions
• Communication style: Direct discussion of prognosis may be culturally inappropriate; consider indirect approaches
• Palliative care discussions: End-of-life conversations require cultural sensitivity and family involvement [24,25]

Postoperative Challenges:

• Airway management: Tracheostomy care in remote settings problematic; discharge planning critical
• Nutritional support: Feeding tube dependency may be culturally challenging
• Shoulder dysfunction: Limited access to physiotherapy in rural areas
• Psychosocial support: Higher rates of depression, anxiety; limited mental health services [26,27]

Māori Populations (Aotearoa New Zealand)

Epidemiological Profile:

Māori experience significant disparities in head and neck cancer outcomes:

• Incidence: 2-3 times higher than European New Zealanders for oral/pharyngeal cancers [28]
• Mortality: Higher age-standardised mortality rates (reflecting later stage at diagnosis) [29]
• Age: Younger presentation similar to Aboriginal populations [30]

Risk Factors:

• Tobacco smoking: 30-35% of Māori adults (vs 13-15% European)
• Alcohol: Contributing factor, particularly in combination with tobacco
• Betel nut: Limited use in some Pacific/Māori communities
• Diet: Traditional diet protective; Western dietary patterns increase risk [31,32]

Te Tiriti o Waitangi Considerations:

1. Equity of access: Ensuring timely referral and surgical management for Māori patients
2. Whānau-centred care: Family involvement in treatment decisions and postoperative support
3. Māori Health Workers: Navigation support for complex surgical pathways
4. Kaupapa Māori approaches: Culturally appropriate communication and support services [33,34]

Rural and Regional Barriers:

• Northland, Tairāwhiti, and Midland regions have limited head and neck surgical capacity
• Inter-regional transfer to Auckland or Wellington required
• Accommodation support for 6-8 week treatment courses
• Postoperative rehabilitation services (speech pathology, physiotherapy) limited outside main centres [35,36]

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Epidemiology and Classification

Head and Neck Cancer Burden

Global Statistics:

• Annual incidence: 890,000 new cases globally (2020) [37]
• Mortality: 450,000 deaths annually [38]
• Male predominance: M:F ratio 2.5-3:1 [39]
• Age: Peak incidence 60-70 years, but increasing in younger patients (HPV-related) [40]

Australian Context:

• 5,100 new cases annually [41]
• 1,100 deaths annually [42]
• Indigenous populations as above (higher incidence, younger age, advanced stage)

Aetiology:

Neck Dissection Classification

Comprehensive (Radical) Neck Dissection:

Removal of:

• All lymph node groups (levels I-V)
• Sternocleidomastoid muscle
• Internal jugular vein
• Spinal accessory nerve
• Submandibular gland
• Tail of parotid

Modified Radical Neck Dissection (MRND):

Removes all lymph node groups but preserves:

• Type I: SCM, IJV, CN XI
• Type II: SCM and/or IJV (CN XI sacrificed)
• Type III ("functional"): SCM, IJV, and CN XI all preserved [46,47]

Selective Neck Dissection:

Preserves one or more lymph node groups based on primary site:

Extended Neck Dissection:

• Includes additional structures not routinely removed (carotid artery, hypoglossal nerve, brachial plexus, etc.)

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Anatomy and Physiology Relevant to Anaesthesia

Carotid Sinus and Baroreceptor Physiology

Carotid Sinus Location:

• Dilatation at bifurcation of common carotid artery
• Located at C3-C4 level
• Contains baroreceptors (pressure sensors) innervated by glossopharyngeal nerve (CN IX) [50,51]

Carotid Sinus Reflex:

• Stimulus: Pressure/manipulation of carotid bifurcation
• Afferent: Carotid sinus nerve (branch of CN IX) → glossopharyngeal nerve → nucleus tractus solitarius
• Efferent: Vagus nerve (CN X) → cardiac pacemaker cells
• Response: Bradycardia, AV block, hypotension, asystole (severe cases) [52,53]

Clinical Implications:

• Incidence during neck dissection: 10-15% [54]
• Risk increased by: Hypovolaemia, hypoxia, hypercarbia, light anaesthesia, carotid atherosclerosis [55]

Venous Drainage of Head and Neck

Internal Jugular Vein (IJV):

• Major venous drainage of head and brain
• Unilateral sacrifice: Usually tolerated; collaterals develop
• Bilateral sacrifice:
  • Increased intracranial pressure (venous congestion)
  • Facial and cerebral oedema
  • Airway oedema (pharyngeal/laryngeal)
  • Requires head-up positioning, avoid Trendelenburg [56,57]

Alternative Venous Pathways:

• External jugular vein
• Vertebral venous plexus
• Facial vein → pterygoid plexus
• Superficial temporal vein

Nerve Supply Relevant to Anaesthesia

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Preoperative Assessment

Airway Evaluation

Factors Predicting Difficult Intubation:

Airway Assessment Score (Mallampati, Cormack-Lehane):

• Document preoperative airway grade
• Assess mouth opening, neck extension, thyromental distance
• Consider awake fibreoptic intubation if difficult airway predicted [62,63]

Investigations:

• CT/MRI of neck: Extent of tumour, airway compromise
• Fibreoptic laryngoscopy (by surgeon/anaesthetist): Assess vocal cord movement, airway patency
• Pulmonary function tests: If concurrent COPD
• Cardiac evaluation: Given age and comorbidities [64,65]

Cardiovascular Assessment

High-Risk Features:

• Age >70 years
• CAD, CHF, CVA history
• Carotid stenosis (may be asymptomatic)
• Hypertension (common in this population)
• Diabetes, renal dysfunction [66,67]

RCRI Assessment:

• Head and neck surgery = intermediate risk (1-5% MACE)
• RCRI ≥2 warrants further evaluation [68]

Carotid Disease:

• 10-20% of patients have significant carotid stenosis
• May require carotid endarterectomy prior to or concurrent with cancer surgery
• Affects haemodynamic management (avoid hypotension) [69,70]

Nutritional and Metabolic Assessment

Preoperative Optimisation:

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Anaesthetic Management

Airway Management

Intubation Strategy:

Nasal vs Oral Intubation:

• Oral: Standard for most cases; better access for oropharyngeal surgery
• Nasal: May be preferred for some oral cavity approaches; secure with throat pack
• Nasal intubation contraindicated if skull base/nasal surgery involved [75,76]

Tracheostomy Considerations:

Indications for Planned Tracheostomy:

• Bilateral neck dissection (airway oedema risk)
• Extensive resection with free flap reconstruction
• Previous radiation (fibrosis, poor wound healing)
• Sleep apnoea, obesity (airway compromise risk)
• Anticipated prolonged ventilation [77,78]

Timing:

• At conclusion of surgery (common)
• Delayed if uncertain about postoperative course
• Cuff management: Keep inflated until airway oedema resolves (typically 48-72 hours)

Intraoperative Management

Monitoring:

Arterial Line Indications:

• All radical/modified radical neck dissections
• Bilateral procedures
• Anticipated significant blood loss
• Carotid artery manipulation
• Cardiovascular comorbidities [81,82]

Haemodynamic Management:

Positioning:

• Supine: Standard
• Head-up 10-15°: Reduces venous congestion, ICP (especially bilateral)
• Head turned: To opposite side for unilateral dissection
• Arm tucked: Ipsilateral arm to improve surgical access
• Pressure care: Heels, sacrum, occiput (long cases) [85,86]

Carotid Sinus Reflex Management

Prevention:

• Ensure adequate depth before carotid manipulation
• Maintain normovolaemia, normoxia, normocapnia
• Surgeon should minimise traction on carotid bifurcation
• Local anaesthetic infiltration around carotid sinus (by surgeon) [87,88]

Treatment:

Neuromuscular Blockade and Nerve Monitoring

When Nerve Monitoring Required:

• Spinal accessory nerve (CN XI) identification
• Hypoglossal nerve (CN XII) preservation
• Vagus nerve (CN X) identification
• Phrenic nerve (rare) [91,92]

NMBA Management:

Alternative: Remifentanil infusion allows reduced NMBA while providing analgesia and immobility

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Postoperative Management

Airway Management

Risk Factors for Airway Compromise:

Extubation Criteria (if no tracheostomy):

• Airway oedema minimal (assess leak around ETT)
• Haemodynamically stable
• Awake, following commands
• Adequate oxygenation on FiO2 ≤0.4
• Haemostasis satisfactory
• Reintubation equipment immediately available [97,98]

Postoperative Airway Monitoring:

• High-dependency or ICU setting
• Continuous SpO2, frequent airway assessments
• Emergency tracheostomy set at bedside
• Steroids to reduce oedema (dexamethasone 4-8 mg IV q8h) [99,100]

Analgesia

Multimodal Analgesia Strategy:

Cervical Plexus Block:

• Superficial cervical plexus block (C2-C4)
• 10-15 mL local anaesthetic at posterior border of sternocleidomastoid
• Provides analgesia to neck skin and superficial structures
• Can be performed by anaesthetist post-induction or surgeon intraoperatively [103,104]

Fluid Management

Goals:

• Maintain euvolaemia
• Avoid fluid overload (airway oedema)
• Replace ongoing losses (drains, evaporation)

Strategy:

• Balanced crystalloid (Plasmalyte, Hartmann's)
• 1-2 mL/kg/hr maintenance
• Replace blood loss 1:1 with crystalloid or 1:3 with blood products
• Consider restrictive strategy if bilateral dissection (airway oedema risk) [105,106]

Complications

Intraoperative Complications:

Postoperative Complications:

Chyle Leak:

• Pathophysiology: Thoracic duct injury (left side) or lymphatic leak (right side)
• Diagnosis: Milky drain output; elevated triglycerides (>110 mg/dL); chylomicrons
• Conservative management:
  • NPO or low-fat diet (medium-chain triglycerides)
  • TPN if high output (>600 mL/day)
  • Octreotide 100 mcg SC TDS to reduce lymph production
  • Pressure dressing
• Surgical: Re-exploration if >600 mL/day after 5-7 days or nutritional compromise [112,113]

Shoulder Syndrome (Spinal Accessory Nerve):

• Presentation: Shoulder pain, weakness, difficulty abducting arm, winged scapula
• Mechanism: Denervation of trapezius muscle (SCM less clinically significant)
• Management: Physiotherapy, pain management, possible surgical reconstruction
• Prevention: Nerve-sparing modified neck dissection when oncologically appropriate [114,115]

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SAQ Practice Questions

SAQ 1: Carotid Sinus Reflex (20 marks)

Scenario: During a radical neck dissection, the patient develops sudden bradycardia (HR 42 bpm, previously 68 bpm) and hypotension (MAP 58 mmHg, previously 75 mmHg) when the surgeon manipulates the carotid bifurcation.

Questions:

a) Explain the pathophysiology of the carotid sinus reflex. (6 marks)

b) Describe your immediate management of this situation. (7 marks)

c) What strategies can prevent recurrence during the remainder of the surgery? (7 marks)

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Model Answer:

a) Pathophysiology (6 marks):

• Location: Carotid sinus at common carotid bifurcation (C3-C4 level) containing baroreceptors (2 marks)
• Afferent: Carotid sinus nerve (branch of glossopharyngeal nerve CN IX) to nucleus tractus solitarius (2 marks)
• Efferent: Vagus nerve (CN X) to cardiac pacemaker cells (1 mark)
• Response: Baroreceptor stimulation → increased afferent firing → parasympathetic outflow → bradycardia, AV block, hypotension, asystole (1 mark)

b) Immediate management (7 marks):

• Stop surgical stimulus: Ask surgeon to pause manipulation immediately (1 mark)
• Assess depth: Ensure adequate anaesthesia depth (1 mark)
• Atropine: 0.6 mg IV (repeat to 1.2 mg if needed) - anticholinergic blocks vagal efferent (2 marks)
• Oxygenation: Ensure FiO2 100%, rule out hypoxia/hypercarbia (1 mark)
• Fluid bolus: If hypovolaemic, give crystalloid to improve filling pressure (1 mark)
• Resume when stable: Wait for HR >60, MAP >65 before continuing (1 mark)

c) Prevention strategies (7 marks):

• Adequate depth: Ensure deep anaesthesia before further carotid manipulation (1 mark)
• Local anaesthetic: Surgeon infiltrates 1-2% lidocaine around carotid sinus (2 marks)
• Surgeon technique: Minimise traction on carotid bifurcation; use gentle dissection (1 mark)
• Maintain MAP: Phenylephrine infusion if needed to avoid hypotension (1 mark)
• Avoid hypoxia/hypercarbia: Increases reflex sensitivity (1 mark)
• Communication: Continuous communication with surgeon about episodes (1 mark)

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SAQ 2: Airway Management in Neck Dissection (20 marks)

Scenario: A 65-year-old man is scheduled for bilateral modified radical neck dissection for squamous cell carcinoma. He has Mallampati III airway, limited neck extension from prior radiation, and stridor on exertion.

Questions:

a) What are the specific risks to his airway in the perioperative period? (6 marks)

b) Outline your airway management strategy. (7 marks)

c) What are your criteria for postoperative airway management? (7 marks)

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Model Answer:

a) Airway risks (6 marks):

• Preoperative: Bulky tumour, radiation fibrosis, stridor = difficult airway and potential obstruction (2 marks)
• Intubation: Difficult intubation predicted (Mallampati III, limited extension, radiation changes) (1 mark)
• Postoperative: Bilateral IJV sacrifice → venous congestion → severe airway oedema (2 marks)
• Haematoma: Neck haematoma can compress airway (1 mark)

b) Airway management strategy (7 marks):

• Preoperative assessment: Fibreoptic laryngoscopy to assess vocal cords and airway calibre (1 mark)
• Awake fibreoptic intubation: Safest approach given difficult airway + stridor (2 marks)
• Tracheostomy: Planned at conclusion of surgery given bilateral dissection + radiation (2 marks)
• Backup plans: Emergency surgical airway equipment ready; rigid bronchoscopy available (1 mark)
• Communication: Discuss with surgeon timing of tracheostomy (1 mark)

c) Postoperative criteria (7 marks):

• Planned tracheostomy: Given bilateral dissection + radiation → high airway oedema risk (2 marks)
• If no tracheostomy: Delayed extubation criteria:
  • Airway leak around ETT (cuff down) (1 mark)
  • Minimal oedema on direct/visualised assessment (1 mark)
  • Haemodynamically stable, normothermic (1 mark)
  • Adequate oxygenation on low FiO2 (1 mark)
  • Reintubation capability immediately available (1 mark)

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SAQ 3: Postoperative Chyle Leak (20 marks)

Scenario: On postoperative day 3 following left radical neck dissection, the patient has drain output of 800 mL of milky fluid in 24 hours. The output has been increasing daily.

Questions:

a) How would you confirm the diagnosis of chyle leak? (6 marks)

b) Outline your conservative management strategy. (7 marks)

c) When would you consider surgical re-exploration? (7 marks)

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Model Answer:

a) Diagnosis confirmation (6 marks):

• Appearance: Milky/creamy fluid (characteristic) (1 mark)
• Triglycerides: >110 mg/dL (or >1.2 mmol/L) in fluid (2 marks)
• Chylomicrons: Present on lipoprotein analysis (gold standard) (1 mark)
• Sudan stain: Fat globules visible (simple test) (1 mark)
• Electrolytes: Monitor for hyponatraemia, hypoproteinaemia (1 mark)

b) Conservative management (7 marks):

• NPO: Nil by mouth to reduce lymph production (1 mark)
• TPN: Total parenteral nutrition if high output (>600 mL/day) for >3-5 days (2 marks)
• Octreotide: 100 mcg SC TDS to reduce splanchnic blood flow and lymph production (2 marks)
• Pressure dressing: Consider if localised leak (1 mark)
• Monitor nutrition: Daily electrolytes, albumin, lymphocyte count (1 mark)

c) Surgical re-exploration indications (7 marks):

• High output: >600 mL/day persisting >5-7 days despite conservative measures (2 marks)
• Nutritional compromise: Hypoproteinaemia, weight loss, lymphopenia (2 marks)
• Failure of conservative therapy: No reduction in output after 7-10 days (1 mark)
• Metabolic complications: Severe electrolyte disturbances (1 mark)
• Wound complications: Wound breakdown, infection (1 mark)

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ANZCA Exam Focus

Viva Voce Preparation

Scenario 1: Difficult Airway + Neck Dissection

"You are assessing a patient for radical neck dissection who has a bulky base of tongue tumour and stridor. How do you manage the airway?"

Key points:

• Awake fibreoptic intubation safest approach
• Maintain spontaneous ventilation until airway secured
• Tracheostomy likely required given bilateral/extensive surgery
• Emergency surgical airway backup essential
• Postoperative airway oedema risk high

Scenario 2: Bilateral Neck Dissection

"What are the specific concerns with bilateral neck dissection?"

Key points:

• Bilateral IJV sacrifice → venous congestion → increased ICP
• Airway oedema (pharyngeal, laryngeal)
• Facial swelling
• Avoid Trendelenburg; head-up positioning
• Planned tracheostomy usually indicated
• Cerebral monitoring if concerned

Scenario 3: Postoperative Airway Obstruction

"A patient post-neck dissection becomes stridulous at 6 hours postoperatively. What is your management?"

Key points:

• Immediate assessment (airway patency, oxygenation)
• Emergency reintubation equipment
• Consider needle cricothyroidotomy if complete obstruction
• Haematoma evacuation vs airway securing first
• Steroids for oedema (limited immediate effect)
• Transfer to ICU/HDU

Written Exam High-Yield Topics

ANZCA Professional Standards

PS07: Guidelines for Perioperative Care

• Difficult airway management protocols
• Postoperative airway monitoring standards
• Documentation of nerve monitoring and NMBA use

PS55(G): Guidelines for the Management of Evolving Airway Obstruction

• Emergency airway algorithms
• Crisis resource management in airway emergencies
• Team communication during airway crises

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This document was created for educational purposes for ANZCA Fellowship examination preparation. All citations are from peer-reviewed literature. Last updated: 2026-02-03