[Coronary-angiographic demonstration of the dilating effect of dipyridamole on coronary arteries and its inhibition by caffeine (author's transl)].

Selective coronary cineangiographies are performed repeatedly in 13 mongrel dogs. The contrast medium itself has no demonstrable dilating effect upon the vessels. After the first injection of 0.

[Intramyocardial pressure at various depths, during aortic constriction and myocardial ischemia in the dog (author's transl)].

Systolic intramyocardial pressure (IMP) is measured with a modification of the "closed perfusion technic" in 3 different layers of the myocardium in 8 anesthetized mongrel dogs. In the subendocardium IMP exceed left ventricular pressure (LVP) by about 30% whereas it is 30% lower than LVP in the subepicardium. Under resting conditions the level of isobaric balance of IMP and LVP is at a distance of 57% from the epicardium.