Comparison of Pressure Support Ventilation (PSV) and Intermittent Mandatory Ventilation (IMV) during Weaning in Patients with Acute Respiratory Failure

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Certain groups of mechanically ventilated patients with acute respiratory failure are difficult to wean from prolonged ventilation despite advanced respiratory support techniques. The common modes for providing support during weaning are intermittent mandatory ventilation (IMV), and spontaneous ventilatory trial (SVT) techniques; such as continuous positive airway pressure (CPAP) and T-piece. Weaning is often initiated with IMV, and a series of SVTs are introduced as the patient tolerates decreasing rates of IMV. However, there is some concern that this strategy of weaning may not be optimal for patient comfort, and muscle reconditioning [1].