Mechanical Vent Test 3 Practice

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Which of the following indicates readiness to wean from mechanical ventilation?

Persistent high FiO2 > 0.6 for 24 hours

Need for deep sedation, high plateau pressures

Hemodynamic instability, requiring vasopressors; inability to tolerate current settings; high FiO2; no progress

Hemodynamic stability, tolerating current ventilator settings, adequate oxygenation at low FiO2, ability to initiate spontaneous breaths, airway protection

Readiness to wean from ventilation rests on the patient being able to tolerate less support while maintaining safe gas exchange and airway protection. The best sign is stability on current settings with adequate oxygenation using a low FiO2, plus the ability to initiate spontaneous breaths and protect the airway. This shows the respiratory muscles are capable and the patient isn’t dependent on the ventilator to maintain oxygenation or ventilation.

If someone needs a high FiO2 for long periods, that indicates ongoing gas-exchange problems, making weaning risky. Deep sedation and high plateau pressures imply poor respiratory drive or stiff lungs, again suggesting not ready. Hemodynamic instability requiring vasopressors, with high FiO2 and no progress, signals overall instability and a poor foundation for weaning.