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Coexistence of hypertrophic obstructive cardiomyopathy and mitral annular calcification: proposed etiologic
Insights
Mitral annular calcification may cause hypertrophic obstructive cardiomyopathy by narrowing the left ventricular outflow tract. This suggests mitral annular calcification is a potential cause of secondary hypertrophic obstructive cardiomyopathy.
Area of Science:
- Cardiology
- Cardiovascular Medicine
- Medical Case Reports
Background:
- Hypertrophic obstructive cardiomyopathy (HOCM) is a condition characterized by thickening of the heart muscle, leading to obstruction of blood flow.
- Mitral annular calcification (MAC) is a common finding in older adults, involving calcification of the mitral valve annulus.
Observation:
- This report details a case presenting with both HOCM and MAC.
- Noninvasive imaging techniques clearly demonstrated the characteristic features of both conditions.
Findings:
- The study proposes a causal link between MAC and HOCM, suggesting MAC can lead to HOCM.
- Narrowing of the left ventricular outflow tract due to MAC is identified as the mechanism.
Implications:
- MAC may be an underrecognized cause of secondary HOCM.
- This finding could influence diagnostic approaches and management strategies for patients with HOCM.
Abstract:
A case of combined hypertrophic obstructive cardiomyopathy and mitral annular calcification is reported. The characteristic features of both entities were clearly demonstrated by thorough noninvasive examinations. It is proposed that the association of the two conditions is not coincidental but that mitral annular calcification, by narrowing of the left ventricular outflow tract, can result in the development of hypertrophic obstructive cardiomyopathy. Mitral annular calcification should possibly be added to the other causes of pressure overload of the left ventricle--such as hypertension and valvular or discrete subvalvular aortic stenosis--as a potential etiology of secondary hypertrophic obstructive cardiomyopathy.