Weaning Mode of Ventilation

Recommended Weaning Approach

The American Thoracic Society recommends using spontaneous breathing trials (SBTs) with modest inspiratory pressure support (5-8 cm H₂O) as the preferred weaning mode, conducted daily in patients who meet readiness criteria, rather than gradual reduction methods like SIMV or progressive PSV weaning 1, 2, 3
Perform daily SBTs rather than gradual weaning methods (SIMV or progressive PSV reduction) as this approach reduces mechanical ventilation duration by approximately 50% and leads to extubation about three times more quickly than gradual methods 1, 4
The Surviving Sepsis Campaign strongly recommends using SBTs in mechanically ventilated patients with sepsis who are ready for weaning (strong recommendation, high quality evidence) 1
A weaning protocol incorporating daily SBTs should be implemented (strong recommendation, moderate quality evidence) 1, 3

Conduct the initial SBT with modest inspiratory pressure augmentation (5-8 cm H₂O pressure support) rather than T-piece alone 2, 3, 5
SBT success rate: 84.6% with pressure support vs 76.7% with T-piece (RR 1.11, 95% CI 1.02-1.18) 2, 5
Extubation success rate: 75.4% with pressure support vs 68.9% with T-piece (RR 1.09, 95% CI 1.02-1.18) 2, 5

Before conducting an SBT, patients must meet these criteria: FiO₂ < 0.50, PEEP ≤ 5 cm H₂O, hemodynamically stable, arousable/adequate mental status, intact airway reflexes, and no new potentially serious conditions 1, 2, 3, 4, 6

Terminate the SBT immediately if any of these develop: respiratory distress, hemodynamic instability, oxygen desaturation or deteriorating gas exchange, altered mental status or agitation, diaphoresis or subjective discomfort 5

Before extubation, assess upper airway patency, bulbar function, cough effectiveness, and sputum load 5
Do not repeat SBTs on the same day after failure - this leads to respiratory muscle fatigue and worsening outcomes 5
Consider prophylactic noninvasive ventilation (NIV) immediately after extubation for patients at high risk of extubation failure 3, 5
For hypercapnic respiratory failure (especially COPD), NIV facilitates weaning with decreased mortality (RR 0.54, 95% CI 0.41-0.70) and reduced weaning failure (RR 0.61, 95% CI 0.48-0.79) 3