ABSTRACT
Studies of the liver circulation in dogs during hypothermia, showed that portal blood flow is reduced with no significant changes of blood pressure and with important vascular resistance. These effects are probably due to the contraction of pre-capillaries sphincters.
Subject(s)
Hypothermia, Induced , Portal Vein/physiology , Animals , Dogs , Liver Circulation , Vascular Resistance , Venous PressureABSTRACT
Studies of the systemic circulation in dogs (n = 5) during hypothermia showed that cardiac output, mean arterial pressure, total peripheral resistance, pulse rate, work L. V. is reduced and the stroke volume is increased. The authors think that these effects are probably due to metabolic alterations during hypothermia.
Subject(s)
Blood Circulation , Hypothermia, Induced , Animals , Aorta/physiology , Blood Pressure , Cardiac Output , Cardiac Volume , Dogs , Pulse , Stroke Volume , Systole , Vascular Resistance , Ventricular FunctionABSTRACT
Micro-angiographic studies of the liver, in dogs under established hypothermy, showed that the contrast injected in the portal vein does not perfuse the sinusoidal structures. This fact is, probably, due to the contraction of pre- and post-capillaries sphincters. On the contrary, in dogs under normal temperature the injected contrast largely perfused the capillaries and all supra-heptic vascular system.
