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AbstractUltrasonic elements inserted parallel to the surface of the anterior wall of the left ventricle in open-chest dogs were used to determine myocardial distances (MCL). During saline loading with and without administration of isoproterenol, end-systolic and end-diastolic MCL were compared with the corresponding ventricular volumes (ESV and EDV), estimated by thermodilution technique. In individual experiments, correlation coefficients for the relationship between MCL3and ventricular volumes ranged from 0.91 to 0.99. It is concluded that stroke volume can be analyzed in terms of end-systolic and end-diastolic MCL, and that the thermodilution technique correctly determines ESV/EDV.Key Words: Adrenergic activitycardiac dimensionscardiac dynamicsisoproterenolmyocardial fiber lengthpreloadthermodilutionultrasonicsventricular volume
Lekven et al. (Sat,) studied this question.