["Tracking" the magnitude of arterial pressure in the circulatory system]

Steady--state characteristics of arterial and venous pressure, cardiac output, total peripheral resistance, heart rate, and pumping heart capacity depending on blood volume change were studied in dogs under conditons of rest, exercises, light and deep narcosis. The tracking mean arterial pressure was found to be the main principle of hemodynamic regulation. In unanesthetized animals the tracking is based on heart regulation component mainly, while under light narcosis it is the vascular component. In deep narcosis it is the suppressed tracking principle: arterial pressure change is proportional to blood volume changes.