Comprehensive Respiratory And Burn Care Practice Test

Which of the following is a typical criterion indicating readiness for a spontaneous breathing trial?

FiO2 ≤ 0.4–0.5 and PEEP ≤ 5–8 cm H2O FiO2 ≥ 0.8 and PEEP ≥ 12 cm H2O Absolute hemodynamic instability High dose vasopressor requirement

Correct Answer:

FiO2 ≤ 0.4–0.5 and PEEP ≤ 5–8 cm H2O

Explanation:

A typical readiness criterion for a spontaneous breathing trial is adequate oxygenation with minimal ventilator support. This is reflected by a low FiO2 (about 0.4–0.5 or less) and a modest PEEP (roughly 5–8 cm H2O or less). Meeting these thresholds indicates the lungs can exchange gas and stay recruited without relying on high oxygen delivery or heavy positive pressure, making it safer to test breathing without full ventilator support. In contrast, requiring high FiO2 and high PEEP signals ongoing oxygenation risk and substantial support needs, while absolute hemodynamic instability or a high-dose vasopressor requirement suggests the patient may not tolerate the stress of spontaneous breathing.

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