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Color-coded Doppler imaging of systolic flow patterns in hypertrophic cardiomyopathy
Insights
Hypertrophic cardiomyopathy with outflow obstruction shows systolic anterior motion of the mitral valve and early mitral incompetence. These findings are absent in patients without obstruction, indicating distinct flow dynamics.
Area of Science:
- Cardiology
- Echocardiography
- Hemodynamics
Background:
- Hypertrophic cardiomyopathy (HCM) is a complex condition affecting heart muscle structure and function.
- Understanding the relationship between systolic structure, function, and flow dynamics in HCM is crucial for diagnosis and management.
Purpose of the Study:
- To assess systolic structure and function in hypertrophic cardiomyopathy patients using color Doppler echocardiography.
- To correlate echocardiographic findings with flow dynamics, specifically outflow obstruction.
Main Methods:
- Color Doppler echocardiography was performed on 11 patients with hypertrophic cardiomyopathy.
- Patients were divided into two groups: 6 with outflow obstruction (Group I) and 5 without (Group II).
- Evaluated parameters included systolic anterior motion of the mitral valve (SAM), midsystolic aortic valve closure (AoC), systolic cavity obliteration, and mitral incompetence.
Main Results:
- All Group I patients exhibited SAM and subaortic turbulence; none in Group II did.
- Early mitral incompetence occurred in all Group I patients before SAM and turbulence, but not in Group II.
- Midsystolic aortic valve closure and unilaterally directed blood flow were observed only in Group I.
Conclusions:
- Early systolic mitral incompetence is common in hypertrophic cardiomyopathy with an outflow gradient and is independent of later mitral incompetence.
- Systolic anterior motion, turbulence, and mid/late systolic mitral incompetence occur simultaneously.
- Midsystolic aortic valve closure is linked to altered blood flow patterns in the outflow tract.
Abstract:
We studied 11 patients with hypertrophic cardiomyopathy by color Doppler echocardiography (Group I: 6 patients with outflow obstruction, and Group II: 5 patients without outflow obstruction) to assess systolic structure and function as observed by cross-sectional echocardiography in relation to the flow dynamics. The structure and function included systolic anterior motion of mitral valve (SAM), midsystolic aortic valve closure (AoC), systolic cavity obliteration and the presence and timing of mitral incompetence. Their occurrence and timing was related to presence of aortic systolic flow and presence of turbulence. While all patients in Group I had SAM and turbulence, none of the patients in Group II had SAM nor turbulence. Early mitral incompetence appearing before SAM and turbulence, occurred in all patients of Group I and in none of Group II. Midsystolic aortic valve closure was only present in Group I and blood flow was unilaterally directed so that only 60% of aortic cross-sectional area showed blood flow. We conclude that mitral incompetence in hypertrophic cardiomyopathy in early systole is common when outflow gradient is present and is independent of mitral incompetence of mid- and late systole. During SAM, turbulence in the subaortic area and mid and late mitral incompetence occurred simultaneously. The midsystolic aortic valve closure was related to the unilaterally directed blood flow through the aortic cross-sectional area.