Fig. 5
From: Expiratory high-frequency percussive ventilation: a novel concept for improving gas exchange
Parameters obtained via mainstream capnography during hypoxia and hypercapnia with normal mechanical ventilation (CMV, open symbols on the left), during high-frequency percussive ventilation (HFPV, blue filled symbols on the right) and during expiratory high-frequency percussive ventilation (eHFPV, red filled symbols on the right). Characters in the legend denote the oscillatory amplitude (2 or 4 cmH2O), the superposed frequency (5 or 10 Hz), and its application phase (E, expiratory phase only; IE, entire breathing cycle). VDF/VT: anatomical dead space fraction according to Fowler, S2V: phase 2 slope, V’CO2: minute elimination of carbon dioxide. *p < 0.05 between HFPV or eHFPV vs. the corresponding CMV