Management of the Intubated Patient
Capnographic confirmation of endotracheal tube placement is mandatory immediately after intubation, and all ICUs must have immediate access to a difficult airway cart and bronchoscope. 1
Tube Verification
- Capnography is the gold standard for confirming correct endotracheal tube position and must be used in all intensive care intubations 1
- Continuous waveform capnography should be maintained throughout the patient's intubated course to detect tube displacement 2
- Physical examination findings (chest rise, auscultation) are adjunctive but insufficient alone for tube confirmation 1
Ventilator Settings
Use lung-protective ventilation strategies to minimize ventilator-induced lung injury:
- Tidal volume: 6-8 mL/kg of predicted body weight (not actual body weight) 2
- Plateau pressure: maintain <30 cm H₂O to prevent barotrauma 2
- PEEP: titrate to maintain adequate oxygenation while minimizing FiO₂ 2
- FiO₂: target SpO₂ 88-95%, avoiding hyperoxia 2
- Monitor peak inspiratory pressures, respiratory rate, and minute ventilation continuously 2
Sedation and Analgesia
Provide adequate analgesia first, then sedation, using objective assessment tools:
- Use validated sedation scales (e.g., RASS, SAS) to titrate medications and avoid over-sedation 3
- Analgesia should precede sedation - treat pain before addressing agitation 2, 3
- Minimize or avoid neuromuscular blocking agents unless absolutely necessary for ventilator synchrony or severe ARDS 2
- Daily sedation interruption or light sedation strategies improve outcomes and reduce ICU length of stay 3
- Account for altered pharmacokinetics in critically ill patients when dosing medications 3
Prophylactic Measures
Essential supportive care includes:
- Elevate head of bed to 30-45 degrees unless contraindicated (e.g., spinal precautions, hemodynamic instability) 2
- Place orogastric or nasogastric tube early to decompress the stomach and reduce aspiration risk 2
- Stress ulcer prophylaxis with H2-blockers or proton pump inhibitors when indicated 2
- Deep venous thrombosis prophylaxis with pharmacologic agents unless contraindicated 2
- Daily assessment for readiness to wean from mechanical ventilation 4
Extubation Criteria
Use a comprehensive protocol with four key evaluation checkpoints:
1. Spontaneous Breathing Trial (SBT) Readiness 4
- Resolution or improvement of the condition requiring intubation
- Adequate oxygenation (PaO₂/FiO₂ >150-200, PEEP ≤5-8 cm H₂O)
- Hemodynamic stability without significant vasopressor support
- Ability to initiate inspiratory effort
- Adequate mental status (follows commands)
2. Successful SBT Performance 4
- Conduct 30-120 minute trial on minimal support (T-piece, CPAP 5 cm H₂O, or low pressure support)
- Monitor for signs of failure: tachypnea (>35/min), hypoxemia, tachycardia, hypertension, diaphoresis, anxiety
3. Extubation Risk Assessment 4
- Patients at low risk of reintubation are appropriate for extubation 5
- Adequate cough strength and airway protective reflexes
- Minimal secretions or ability to clear secretions
- No significant upper airway edema (consider cuff leak test if concern exists)
4. Post-Extubation Planning 4
- Consider prophylactic non-invasive positive pressure ventilation (NPPV) for high-risk patients 4
- Ensure close monitoring capability and ability to reintubate emergently 5
- Intensive nursing care must be available 5
Common Pitfalls
- Avoid extubation in the emergency department unless the patient has near-zero risk of reintubation failure and intensive monitoring is available 5
- The comprehensive protocol approach reduces post-extubation respiratory failure (9.7%) and reintubation rates (5.2%) compared to historical controls 4
- Standardize intubation and extubation procedures within each unit to avoid idiosyncratic practices 1, 6
- Ensure daily equipment checks of difficult airway carts and maintain immediately available bronchoscopy capability 1