A reevaluation of the effect of transrespiratory pressure on the breathing pattern of intubated mice.
This study aimed to determine if the effect of transrespiratory pressure on respiration was due to alveolar pressure minus the body surface pressure or from the co-effects of two-sided pressure. After introducing air pressure into the trachea of intubated mice, the tidal volume (VT) showed no significant changes, but the respiratory frequency (f) and minute ventilation (VE) were significantly decreased. Positive body surface pressure significantly increased f and VE; however, VT was not significantly affected. Interestingly, f and VE at 2.5 cm H2O were higher than at 5 cm H2O. Simultaneous positive air pressure on both the alveoli and body surface demonstrated no significant effect on the VT but significantly decreased f and VE. This inhibitory effect consisted of the combined activities of the inhibitory effects of positive tracheal pressure and the activated effects of positive body surface pressure. Taken together, the effect of transrespiratory pressure on respiration was due to the co-effect of alveolar pressure and body surface pressure.
Respiration Department of Tongde Hospital of Zhejiang Province, Gucui Road #234, 310012 Hangzhou, China. Electronic address: xwhzju@163.com.
Wei-hua
WH
Xu
D000388:Air; D000818:Animals; D007442:Intubation, Intratracheal; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010991:Plethysmography; D011312:Pressure; D011650:Pulmonary Alveoli / Q000502:physiology; D012119:Respiration; D013990:Tidal Volume; D013997:Time Factors; D014132:Trachea / Q000502:physiology*
Mice; Observation; Plethysmography; Pressure; Respiration