in 22 tests on an isolated dog 's heart perfused from a donor the oxygen intake , coronary blood flow , oxyhemoglobin content in the coronary venous blood and arterio-venous difference were compared with a jumpwise and gradual depression of the electrostimulation of the heart rhythm from 4.5 down to 2.0-2.5 hd .
C0018787
heart
C3495141
coronary venous