Ventricular volume studies in a patient with hypertrophic subaortic stenosis.

the hemodynamic findings in detail. The hemodynamic responses of such patients to various drugs have been studied in a number of laboratories.4 8 Angiographic studies have portrayed certain anatomic features of this disorder,9' 10 but recently the existence of the chamber obstruction has been questioned."' Although the anatomic features and physiological responses of the left ventricle in hypertrophic subaortic stenosis have been investigated, only recently have the systolic and diastolic volumetric characteristics of the ventricle been examined.'2-14 The purpose of the present report is to describe changes in left ventricular volume which occurred during the study of a patient with hypertrophic subaortic stenosis. The ventricular volume measure-