Which criteria are used to predict success in weaning from mechanical ventilation for respiratory failure?

Updated: Apr 07, 2020
  • Author: Ata Murat Kaynar, MD; Chief Editor: Michael R Pinsky, MD, CM, Dr(HC), FCCP, FAPS, MCCM  more...
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Answer

Many criteria have been used to predict success in weaning, including a minute ventilation of less than 10 L/min, maximal inspiratory pressure more than –25 cm water, vital capacity more than 10 mL/kg, absence of dyspnea, absence of paradoxical respiratory muscle activity, and agitation or tachycardia during the weaning trial. However, the rapid-shallow breathing index—that is, the patient’s tidal volume (in liters) divided by the respiratory rate (in breaths/min) during a period of spontaneous breathing—may be a better predictor of successful extubation.

In one study, a daily trial of spontaneous breathing in patients with a rapid-shallow breathing index of less than 105 resulted in a shorter duration of mechanical ventilation. A spontaneous breathing trial of only 30 minutes appears adequate to identify patients in whom successful extubation is likely.


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