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Fig. 2 | Respiratory Research

Fig. 2

From: Expiratory high-frequency percussive ventilation: a novel concept for improving gas exchange

Fig. 2

Experimental protocol scheme. Measurements were initially made under normocapnic conditions (baseline) and continued during the maintenance of hypoxia and hypercapnia by decreasing the ventilation frequency. Four sequences including a high-frequency percussive ventilation (HFPV) and an expiratory high-frequency percussive ventilation (eHFPV), each preceded by a conventional mechanical ventilation (CMV), was then performed. Both HFPV and eHFPV were applied by randomly setting the oscillatory amplitude (2 or 4 cmH2O) and the oscillatory frequency (5 or 10 Hz). BG: blood gas; Vcap: volumetric capnography; Vent: recording the mechanical ventilation pressure/volume parameters; FOT: forced oscillations

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