A Case of Left Ventricular Outflow Obstruction Caused by Mitral Valve Replacement

Abstract

The pathophysiology, clinical presentation and prognosis of left ventricular obstruction present an important cardiological problem. Various anatomical and functional abnormality can cause this phenomenon. Rarely, left ventricular outflow obstruction can result after mitral valve surgery. We experienced a case of left ventricular outflow obstruction 13 years after mitral valve replacement. The diagnosis was made using two-dimensinal Doppler echocardiography and confirmed by cardiac catheterization. The pressure gradient across the left ventricular outflow obstruction was 96mmHg. A second mitral valve replacement was performed. Because severe fibrosis, pannus around the prosthetic mitral valve and a subaortic web were detected during the operation, the subaortic web was removed. KEY WORDS Mitral valve replacement·Left ventricular outflow obstruction.서 론

Dynamic left ventricular outflow tract obstruction without basal septal hypertrophy, caused by catecholamine therapy and volume depletion

“…It is well known that hypertrophic obstructive cardiomyopathy (HCM) is the most frequently reported cause of the dynamic LVOT obstruction 1 - 3) . As well, a hyperdynamic state as a result of catecholamine therapy 6 , 7) has been linked to this condition.…”