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

Table 3 Means and standard deviations of the analyzed values of respiratory system compliance

Value	Mean ± SD (ml/cmH ₂O)
C_rs(PEEP wave)	59.8 ± 20.8
C_rs(PEEP wave)_ventral	40.9 ± 15.9
C_rs(PEEP wave)_dorsal	18.8 ± 9.3^a
C_rs(PEEP wave) per pixel	0.20 ± 0.09
C_rs(PEEP wave)_ventral per pixel	0.26 ± 0.13
C_rs(PEEP wave)_dorsal per pixel	0.14 ± 0.07^b
C_rs(low-flow)	53.0 ± 22.4
C_rs(low-flow)_ventral	36.2 ± 16.5
C_rs(low-flow)_dorsal	16.8 ± 8.8^a
C_rs(low-flow) per pixel	0.18 ± 0.07
C_rs(low-flow)_ventral per pixel	0.23 ± 0.11
C_rs(low-flow)_dorsal per pixel	0.12 ± 0.06^a
C_rs(CMV)	47.1 ± 21.6

^aSignificantly different from the corresponding value in the ventral region (P <0.0001). ^bSignificantly different from the corresponding value in the ventral region (P = 0.0002). Per-pixel values were obtained by dividing the ventral and dorsal values of C_rs by the total number of image pixels in the respective regions of interest. C_rs(PEEP wave): Respiratory system compliance obtained by performing the positive end-expiratory pressure (PEEP) wave maneuver during pressure support ventilation; C_rs(low-flow): Quasi-static C_rs obtained with the low-flow loop during controlled mechanical ventilation; C_rs(CMV): C_rs calculated by dividing expiratory tidal volume by the difference between plateau airway pressure and PEEP during controlled mechanical ventilation.

ISSN: 1364-8535