Two Types of Intraventricular Pressure Difference in the Same Patient

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Abstract
Two types of intraventricular pressure difference were encountered in a single patient who presented with clinical evidence of obstruction to right ventricular outflow and nonobstructive cardiomyopathy of the left ventricle. On the basis of measurements of inflow tract pressure, the pressure difference in the right ventricle was demonstrated to be due to muscular subvalvular obstruction to right ventricular outflow, whereas the pressure difference in the left ventricle resulted from catheter entrapment in the myocardium. This combination of intraventricular pressure differences must be differentiated from the situation in muscular subaortic stenosis, in which biventricular obstruction to outflow occurs.