Microlaryngoscopy and laser airway surgery

10 min read Last updated April 9, 2026

Surgical approach

  • Patient supine, head on ring, neck extension (“sniffing”/Boyce position) to align oral–pharyngeal–laryngeal axes
  • Suspension microlaryngoscopy: rigid laryngoscope inserted transorally and suspended on a stand, microscope/endoscope used for magnification
    • Procedures: biopsy, excision of polyps/nodules, papillomatosis debulking, cordectomy, dilation, subglottic stenosis work, foreign body removal
  • Laser airway surgery: laser delivered via micromanipulator (CO₂) or fibre (e.g. KTP) to ablate/cut lesions
    • Laser safety: eye protection, warning signs, smoke evacuation, wet swabs around laryngoscope, minimise oxidiser concentration
  • Shared airway: surgeon requires unobstructed view of glottis/subglottis, may request intermittent apnoea, jet ventilation, or small/laser tube

Anaesthetic management

  • Type of anaesthesia: General anaesthesia with controlled ventilation or tubeless technique (apnoea/jet/spontaneous) depending on lesion and surgeon preference
  • Airway device options: laser-resistant ETT (cuffed), microlaryngeal tube (MLT), tubeless (THRIVE, jet ventilation, intermittent apnoea)
  • Typical duration: 20–90 minutes (can be longer for extensive papillomatosis/stenosis work)
  • Pain: usually mild–moderate, main issues are airway irritation, coughing, laryngospasm, sore throat, consider opioid-sparing to aid smooth emergence
  • Key priorities: oxygenation/ventilation with shared airway, immobility, suppression of airway reflexes, fire prevention, and a rehearsed airway rescue plan

Indications and patient factors

  • Common indications: vocal cord polyps/nodules, Reinke’s oedema, papillomatosis, leukoplakia/dysplasia, early glottic cancer, subglottic stenosis, granuloma, foreign body
  • Symptoms suggesting difficult/critical airway: stridor (inspiratory/biphasic), dyspnoea at rest, voice change, inability to lie flat, previous radiotherapy, prior airway surgery
  • Comorbidity considerations: OSA/obesity (airway obstruction), COPD/asthma (air trapping with jet ventilation), reflux (laryngeal irritation), anticoagulation (bleeding obscures view/aspiration)
  • Pre-op assessment: flexible nasendoscopy findings if available, imaging (CT) for stenosis/tumour, baseline voice/airway symptoms, previous anaesthetic records

Pre-operative planning and communication

  • Agree with surgeon: lesion location (supraglottic/glottic/subglottic/tracheal), need for laser, need for tubeless field, and rescue strategy (including emergency tracheostomy/cricothyrotomy)
  • Discuss ventilation strategy: MLT/laser tube vs jet vs THRIVE vs intermittent apnoea, define triggers for stopping surgery and re-establishing ventilation
  • Prepare difficult airway equipment: videolaryngoscope, fibreoptic scope, bougies, smaller tubes, front-of-neck access kit, ensure ENT tracheostomy set immediately available
  • Laser checklist: laser sign, key control, eye protection for all, wet swabs, smoke evacuation, appropriate ETT, lowest feasible FiO₂, avoid N₂O

Airway/ventilation techniques (pros/cons)

  • Microlaryngeal tube (MLT) (e.g. 5.0–6.0 ID, longer): good ventilation and protection from blood/debris, still obstructs surgical view, tube movement can hinder precision
    • Useful when laser not used or when surgeon accepts tube in field
  • Laser-resistant ETT (cuffed): reduces ignition risk but not fire-proof, cuff can be filled with saline (often with dye) to detect rupture, use lowest FiO₂ and avoid N₂O
    • Disadvantages: larger external diameter, reduced view, potential cuff injury/airway trauma
  • Intermittent apnoea: preoxygenate, apnoeic window for surgery, then re-ventilate, excellent view, simple, limited by desaturation/hypercapnia and repeated instrumentation
  • THRIVE (high-flow nasal oxygen): extends apnoea time and improves oxygenation, CO₂ rises progressively, less reliable in severe obstruction, fire risk if laser near oxygen plume—must coordinate and minimise FiO₂/flow as appropriate
    • Monitor: continuous SpO₂, consider transcutaneous CO₂ or frequent ETCO₂ surrogates when ventilation resumes
  • Jet ventilation (supraglottic/infraglottic/subglottic): tubeless field, requires expertise, risks include barotrauma, pneumothorax, subcutaneous emphysema, inadequate exhalation/air trapping, aspiration of blood/debris
    • Contraindications/relative: severe distal obstruction, poor egress (stenosis), bullous lung disease, severe COPD, active lower airway pathology
    • Monitoring: chest movement, SpO₂, airway pressure alarms (if available), careful observation for surgical emphysema, ETCO₂ may be unreliable
  • Spontaneous ventilation with TIVA/volatile: sometimes used for dynamic lesions, risk of coughing/laryngospasm and movement, may be useful when maintaining tone is desired (selected cases)

Anaesthetic technique

  • Induction: IV induction common (propofol ± opioid), consider inhalational induction if critical obstruction/stridor and concern about losing airway tone
    • If critical obstruction: maintain spontaneous ventilation until ability to ventilate confirmed, have ENT present and front-of-neck access plan
  • Maintenance: TIVA (propofol/remifentanil) often preferred for immobility, rapid wake-up, reduced airway reactivity, and stable conditions during tubeless phases
    • Volatile is acceptable if airway secured and no long apnoeic phases, beware theatre pollution if frequent circuit disconnections
  • Muscle relaxation: commonly used for tubed techniques and intermittent apnoea, avoid if surgeon requests spontaneous ventilation, ensure full reversal before extubation
  • Topicalisation: lidocaine to larynx/trachea can reduce reflexes, keep within safe dose (consider all sources)
  • Analgesia: paracetamol ± NSAID (if appropriate), small opioid doses often sufficient, consider dexamethasone for PONV and airway oedema
  • Emergence: aim for smooth, non-coughing wake-up to avoid bleeding/airway trauma, consider lidocaine, remifentanil washout strategy, and extubation plan (deep vs awake depending on risk)
    • High-risk airway oedema/bleeding/obstruction: extubate fully awake with ENT present, consider staged extubation or post-op HDU/ICU

Laser-specific considerations

  • Fire triangle: ignition source (laser), oxidiser (O₂/N₂O), fuel (ETT, swabs, drapes, airway secretions)
  • Oxidiser control: use the lowest FiO₂ compatible with safe oxygenation, avoid N₂O (supports combustion and expands cuffs/bowel gas)
  • Tube/cuff: use laser-resistant tube when appropriate, fill cuff with saline (often tinted) and protect with wet pledgets, keep cuff below cords if possible
  • Gas leaks: minimise leaks around tube, avoid oxygen pooling in pharynx, coordinate with surgeon before laser activation
  • Smoke plume: use smoke evacuation, consider staff exposure and visibility, plume contains particulates and potentially viral material (e.g. papillomatosis)

Management of airway fire

  • Immediate actions: stop laser, stop ventilation and disconnect circuit, turn off oxygen/air flows
  • Remove burning material: remove ETT (and any fragments) promptly, remove burning swabs/foreign material from airway
  • Extinguish: pour saline/water into airway if needed, then re-establish ventilation with air/lowest FiO₂ via mask or reintubation
  • Re-assess airway: rigid/fibreoptic bronchoscopy to assess thermal injury and remove debris, consider ICU, humidified oxygen, steroids, antibiotics per local policy
  • Escalate: if cannot ventilate/intubate—front-of-neck access, involve ENT immediately

Complications and post-operative care

  • Airway: laryngospasm, bronchospasm, airway oedema, bleeding/haematoma, aspiration of blood/debris, dental/lip trauma from suspension laryngoscope
  • Ventilation strategy complications: hypercapnia (apnoea/THRIVE), barotrauma/pneumothorax (jet), gastric insufflation/aspiration (jet), tube displacement
  • Laser: airway fire, thermal injury, eye injury, plume exposure
  • Post-op: observe for stridor/respiratory distress, consider nebulised adrenaline, steroids, humidification, low threshold for re-examination and ICU if concern

Test yourself…

You are asked to anaesthetise a patient for microlaryngoscopy and CO₂ laser excision of a vocal cord lesion. What are your main anaesthetic concerns?

Structure around shared airway, fire risk, and safe emergence.

  • Shared airway: maintaining oxygenation/ventilation while providing an unobstructed surgical field, anticipate repeated airway manipulation
  • Airway fire risk: laser + oxidiser + fuel, plan to minimise FiO₂, avoid N₂O, use appropriate tube/cuff strategy and wet swabs
  • Need for immobility and suppression of airway reflexes (coughing/laryngospasm) to allow precise laser work
  • Airway rescue: plan for loss of airway, bleeding, laryngospasm, tube displacement, ensure ENT and FONA readiness
  • Post-op obstruction risks: oedema, bleeding, laryngospasm, plan extubation and post-op observation/ICU if indicated
Describe how you would reduce the risk of airway fire during laser airway surgery.

Address each side of the fire triangle: oxidiser, fuel, ignition source.

  • Oxidiser: use lowest FiO₂ compatible with safe SpO₂, avoid N₂O, minimise oxygen pooling (avoid large leaks, consider air/oxygen blend)
  • Fuel: use laser-resistant ETT when appropriate, saline-filled cuff (often dyed), protect cuff/tube with wet pledgets, keep surgical field free of dry swabs
  • Ignition control: clear communication—laser only on when ready, standby mode when not in use, laser safety checks and trained operator
  • Environment: eye protection for all, warning signs, smoke evacuation, avoid flammable prep solutions pooling
What is your immediate management if an endotracheal tube ignites during laser surgery?

Time-critical drill, prioritise stopping combustion and re-establishing oxygenation.

  • Stop laser immediately, stop ventilation, disconnect circuit, turn off all gas flows
  • Remove ETT promptly (and any burning fragments), remove burning swabs/foreign material
  • Flood airway with saline/water if needed to extinguish residual fire
  • Re-oxygenate/ventilate with air then lowest FiO₂, reintubate as required (consider smaller tube) or mask ventilate
  • Bronchoscopy to assess injury and remove debris, plan ICU, humidification, steroids/analgesia, document and incident report
Compare options for ventilation during microlaryngoscopy: MLT/laser tube vs intermittent apnoea vs jet ventilation vs THRIVE.

Compare in terms of view, oxygenation/CO₂ control, aspiration protection, and complications.

  • MLT/laser tube: reliable ventilation and airway protection, tube obstructs view and can be struck by laser, fire risk remains
  • Intermittent apnoea: excellent view, simple, limited by desaturation/hypercapnia, repeated instrumentation and potential trauma
  • Jet ventilation: tubeless field and continuous oxygenation, risks barotrauma, air trapping, pneumothorax, surgical emphysema, CO₂ monitoring difficult, aspiration risk
  • THRIVE: prolongs apnoea and improves oxygenation, CO₂ rises, less effective in severe obstruction, must manage oxygen plume/fire risk with laser
A patient has stridor and a suspected laryngeal tumour for microlaryngoscopy and biopsy. How would you approach induction and securing the airway?

Goal: avoid converting partial obstruction into complete obstruction, maintain oxygenation and a rescue route.

  • Pre-op: review nasendoscopy/imaging, assess severity (resting stridor, inability to lie flat), discuss with ENT and plan for emergency tracheostomy
  • Induction strategy: consider maintaining spontaneous ventilation (e.g. inhalational or carefully titrated IV) until ability to ventilate is confirmed
  • Airway options: awake fibreoptic intubation may be difficult if lesion bleeds/obstructs, consider awake tracheostomy in extreme cases, have smaller tubes and alternative devices ready
  • Avoid: heavy sedation without a plan, paralysis before confirming mask ventilation in a precarious airway
  • Rescue: clear triggers for abandoning attempts and proceeding to FONA, ensure skilled help present
How would you monitor ventilation during jet ventilation or prolonged apnoeic techniques?

ETCO₂ may be unreliable, use multiple modalities and clinical assessment.

  • Oxygenation: continuous pulse oximetry, consider arterial line if high risk/long case
  • Ventilation: observe chest movement, listen for exhalation, watch for air trapping, consider transcutaneous CO₂ monitoring
  • CO₂: intermittent capnography when circuit reconnected, arterial blood gases if prolonged/unstable
  • Complications: monitor for surgical emphysema, pneumothorax (sudden desaturation, hypotension, increased airway pressure if measurable)
What are the advantages of TIVA for microlaryngoscopy and laser airway surgery?

Think: operating conditions, rapid control, and compatibility with tubeless phases.

  • Stable depth with minimal movement/coughing (propofol + remifentanil commonly used)
  • Rapid wake-up and titratability, useful when alternating between apnoea and ventilation
  • Less theatre pollution during frequent circuit disconnections compared with volatile techniques
  • Potentially reduced PONV with propofol-based techniques
List complications specific to suspension microlaryngoscopy and how you would mitigate them.

Mainly mechanical trauma and airway events.

  • Dental/lip/tongue trauma: careful insertion, dental guards, padding, check pressure points, document pre-existing dental issues
  • Tongue oedema/neuropraxia from prolonged suspension: minimise duration, intermittent release if long case, monitor post-op swelling
  • Laryngospasm/bronchospasm: adequate depth, topical lidocaine, smooth emergence, treat promptly (CPAP, propofol, suxamethonium if needed)
  • Bleeding/aspiration: secure airway when appropriate, suction available, consider throat pack with clear documentation and removal
How would you plan extubation after laser surgery on the vocal cords?

Balance smoothness vs safety, anticipate oedema and bleeding.

  • Assess risk: extent of surgery, bleeding, airway swelling, pre-op stridor, difficult airway, comorbid OSA/obesity
  • Smooth emergence: minimise coughing (consider lidocaine, careful opioid strategy), ensure full reversal and adequate ventilation
  • High-risk: extubate fully awake with ENT immediately available, consider staged extubation (airway exchange catheter) or post-op intubation/ICU
  • Post-op: monitor for stridor, treat with humidified oxygen, nebulised adrenaline, steroids, low threshold to re-scope/reintubate

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