[Assessment of haemodynamic parameters using non-triggered radioisotope methods (author's transl)]

The minimal transit times (MTTs) are the shortest transport times of a tracer in sequential segments of the heart. The MTTs are measured with a conventional gamma camera, after an i.v. injection of an intravenously retained radiopharmaceutical. Theoretical considerations predict that the MTTs are inversely proportional to the "ejection fraction" of a given segment. An advantage of this method is that the MTTs not only yield information about the function of the left ventricle but also indicate the haemodynamic status of all the other heart segments. The MTT measurement is not susceptible to disturbances related to background correction and ventricle delineation, and is easily performed even under peak exercise conditions. By means of comprehensive data the sensitivity usefullness of this quick and easy procedure are demonstrated.