[Blood flow in the inferior vena cava measured by a Doppler ultrasound flowmeter in chronic experiments on cats].

Supercound Doppler's transducers indwelled in the cat v. cava posterior revealed that the higher blood flow values in chronic experiments as compared to acute ones were due to the effect of the chest suction action on the blood flow. The phasic changes of the venous blood flow occurring at resting and under various effects were related to respiration and heart activity, the respiratory component being more obvious than the cardiac one. A significant correlation existed between the mean value of the blood flow in the v. cava posterior and the respiratory changes of the blood flow amplitude.