Echocardiography can distinguish supravalvular mitral stenosis from cor triatriatum sinister based on the position of the obstructing membrane relative to the left auricle.
Echocardiographic membrane position may differentiate SMS from CTS; case report leaves open need for validation in additional patients.
A 3-year-old, 4-kg, castrated male domestic shorthair cat presented with signs of progressive respiratory distress. Thoracic radiographs showed pulmonary edema and pleural effusion. Echocardiography revealed a perforate membrane immediately above the mitral valve that divided the left atrium into proximal and distal chambers. The left auricle was proximal to the dividing membrane and connected to the markedly enlarged proximal left atrial chamber, consistent with the diagnosis of supravalvular mitral stenosis (SMS). Position of the obstructing membrane relative to the left auricle distinguishes SMS from cor triatriatum sinister (CTS). In CTS, the left auricle is distal to the dividing membrane and connects to the distal left atrial chamber.
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Fine et al. (2002) studied this question.
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