[Dynamic obstruction of the left ventricular outflow as a late complication of mitral valve replacement. Case report].

The obstruction of the left ventricular tract outflow following mitral valve surgery, as a late complication, is rarely reported in the literature. The case of a 47-yr-old woman, who, after mitral valve surgery, developed dynamic left ventricular tract outflow obstruction four years later is reported. This alteration was detected by 2D echo-Doppler. The echocardiographic findings were: 1) Normal function of the mitral prosthesis. 2) An equal pressure-gradient of 44 mmHg at rest and of 75 mmHg after amyl nitrite at three examined levels: below, above and at the level of the aortic valve. 3) A hyper-echo image in the peri-annular region, probably representing fibrous degeneration around the valve ring, which was the likely cause of the obstruction. Th data were confirmed by cardiac catheterization. The echocardiographic technique appears to be a useful tool to detect and study this complication of mitral valve surgery.