A weaning failure is best described as?

• A. Inability to tolerate an SBT or maintain adequate gas exchange.
• B. Immediate extubation without issues.
• C. Complete tolerance of SBT.
• D. Stable gas exchange without any trial.

Answer: (A)

Weaning failure means the patient cannot complete a spontaneous breathing trial or cannot keep gas exchange adequate when support is reduced. The spontaneous breathing trial tests whether the patient can breathe without or with minimal ventilator help. If the patient shows signs of distress, increased work of breathing, desaturation, rising CO2, fatigue, or hemodynamic instability during the trial, this indicates the weaning attempt has failed. It also covers situations where, even if the trial is tolerated, the patient cannot maintain adequate gas exchange after extubation. In contrast, immediate extubation without issues, complete tolerance of the trial, or stable gas exchange with no trial would indicate readiness or a non-failure scenario, not a failure of weaning.