Table 1.

Displacement of rib 10 and pressure changes during spontaneous diaphragmatic breathing and mechanical ventilation in dogs

	Axial rib motion (mm)	Lateral rib motion (mm)	ΔPpl (cmH2O)	ΔPab (cmH2O)	ΔPdi (cmH2O)
Quiet breathing	1.20 ± 0.24	0.88 ± 0.18	−4.46 ± 0.47	+2.24 ± 0.36	+6.71 ± 0.77
Occluded breaths	1.26 ± 0.34	1.00 ± 0.22	−12.57 ± 1.14	+2.23 ± 0.35	+14.80 ± 1.35
Mechanical ventilation	1.83 ± 0.20	1.16 ± 0.19	+4.93 ± 0.18	+2.44 ± 0.23	−2.50 ± 0.26

Values are means ± SEM for eight dogs. Abbreviations: P_ab, abdominal pressure; P_di, transdiaphragmatic pressure; and P_pl, pleural pressure.