[Non-invasive study of the patency of aortocoronary bypass with pulsed Doppler technic. Preliminary studies].

The pulsed Doppler effect is a non-invasive investigation technique based on the fact that the blood cells moving in a vessel on which ultrasound is incident cause a rebound of different frequency, according to their rate. This technique allows us to measure flow in a "measuring volume", whose size and depth are regulable. It is also possible to collect the signal from one or several aorto-coronary grafts, and to distinguish these from the sorrounding vasculature by their diastolic perfusion.

Biochemical heterogenity of the left ventricular myocardium: transmural and base-apex gradients on H.E.P. contents of the well oxygenated perfused dog heart.

An investigation into the contents (mumol/g w.w.) of the creatine phosphate (CP) and adenosine triphosphate (ATP) of various myocardial regions was performed on the empty beating isolated blood perfused dog heart.