CLINICAL METHODS TO DETERMINE CORONARY FLOW AND MYOCARDIAL PERFUSION

In this overview, currently available clinical methods to measure flow in the coronary circulation will be discussed. Methods only applicabl e in the experimental laboratory or in the anaesthetized patient durin g cardiac surgery, will not be described. We distinguish between metho ds that measure global blood flow, and methods that determine regional flow, either at the level of the coronary arteries or at the level of the myocardium. Since it is difficult to measure coronary flow in abs olute values, 'flow reserve' is often used as an alternative. mow rese rve is calculated by dividing maximal flow, usually pharmacologically induced, by basal flow. Consequently, assessment of flow reserve requi res only measurements of relative changes of coronary flow. The applic ability and relative merits and limitations of the techniques are disc ussed.