Tissue oxygen tension of the subepicardial (Epi Po2) and subendocardial (Endo Po2) regions of the canine left ventricular wall was determined polarographically. Chromonar consistently increased Epi Po2; Endo Po2 was decreased in half the studies and elevated in the other half. Coronary blood flow was maximally increased by chromonar and reactive hyperemia abolished. Nitroglycerin selectively increased Endo Po2 before and after chromonar. This suggests that arteriolar dilatation is not a requisite for the rise in Endo Po2 by nitroglycerin.
All Science Journal Classification (ASJC) codes
- Coronary arteriolar dilation
- Distribution of coronary blood flow
- Nitroglycerin Intramyocardial Po