Abstract
In 14 rabbits the oxygen saturation of arterial as well as mixed venous bloods during bilateral open chest under both 4cm. and 8cm. of water positive pressure was determined.
(1) The oxygen saturation of arterial blood during bilateral open chest under 8cm of water positive pressure was normal or above normal by insulating with oxygen, while the utilization of oxygen by tissues increased.
(2) When air was insulated, the oxygen saturation of arterial blood was lower in bilateral open chest than in unilateral open chest under atmospheric pressure.
(3) The oxygen saturation of arterial blood during bilateral open chest under 4cm. of water positive pressure, distinctly decreased.
