Comparison of the effects of continuous negative external chest pressure and positive end-expiratory pressure on cardiac index in dogs.
Continuous negative external chest pressure was used to increase the functional residual capacity in 6 dogs, and the effects were compared with the effects of increasing functional residual capacity using positive end-expiratory pressure. Cardiac index and mixed venous O2 stauration each decreased from control values during positive end-expiratory pressure, but did not decrease with continuous negative external chest pressure. Continuous negative external chest pressure may provide an alternative to positive end-expiratory pressure for increasing the functional residual capacity of patients in whom the latter causes unacceptable decreases in venous return and cardiac output.
D000818:Animals; D002302:Cardiac Output; D004285:Dogs; D005652:Functional Residual Capacity; D010100:Oxygen / Q000097:blood; D011175:Positive-Pressure Respiration; D011312:Pressure; D012121:Respiration, Artificial; D013909:Thorax / Q000502:physiology*; D014680:Veins
D010100:Oxygen