1. Effect of pressure support (PS) and continuous positive airway pressure (CPAP) on frequency-to-tidal volume ratio (f/VT). Left panel: In twelve patients with COPD, f/VT was 145 ± 121 (standard deviation [SD]) while patients received no ventilator assistance; the addition of PS 5 cm H2O caused f/VT to decrease to 79 ± 53 (45% decrease).90,138,139Right panel: In thirty-three postoperative patients, f/VT was 71 ± 23 (SD) during unassisted breathing; the addition of CPAP 5 cm H2O caused f/VT to decrease to 36 ± 14 (49% decrease).93
Source: Chapter 58. Weaning from Mechanical Ventilation, Principles and Practice of Mechanical Ventilation, 3e
Citation: Tobin MJ. Principles and Practice of Mechanical Ventilation, 3e; 2013 Available at: Accessed: November 07, 2017
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