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Figure 4 | Critical Care

Figure 4

From: Assessment of respiratory system compliance with electrical impedance tomography using a positive end-expiratory pressure wave maneuver during pressure support ventilation: a pilot clinical study

Figure 4

Low-flow pressure-volume loop. (A) Example of a global low-flow pressure-volume loop in one of the studied patients. The slope of global volume change (∆V) divided by the corresponding change in airway pressure (∆Paw) was calculated in the pressure range that was examined with the positive end-expiratory pressure (PEEP) wave, providing a reference value for global respiratory system compliance (Crs(low-flow)). The dashed lines indicate the pressure range investigated during the PEEP wave maneuver. (B) Regional pressure-impedance (rel.∆Z) loops obtained by electrical impedance tomography during the same maneuver. The slopes of the curves obtained in the ventral and dorsal lung regions were multiplied by Crs(low-flow) to yield the reference values of Crs(low-flow)ventral and Crs(low-flow)dorsal, respectively. The dotted lines indicate the investigated pressure range (PEEP − PEEP +5).

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Critical Care

ISSN: 1364-8535