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Left ventricular filling in hypertrophic cardiomyopathy: a pulsed Doppler echocardiographic study
Insights
Patients with hypertrophic cardiomyopathy (HCM) without systolic anterior motion exhibit impaired left ventricular diastolic filling. This is evidenced by altered mitral flow velocity patterns, indicating reduced early filling and increased reliance on atrial contraction.
Area of Science:
- Cardiology
- Echocardiography
- Diastology
Background:
- Abnormal left ventricular diastolic properties are characteristic of hypertrophic cardiomyopathy (HCM).
- Assessing diastolic function is crucial for understanding HCM pathophysiology.
Purpose of the Study:
- To evaluate left ventricular diastolic filling characteristics in HCM patients using pulsed Doppler echocardiography.
- To compare diastolic function between HCM patients with and without systolic anterior motion (SAM) of the mitral valve.
Main Methods:
- Pulsed Doppler echocardiography was used to record mitral flow velocity in 17 HCM patients and 16 controls.
- Measurements included early and late diastolic peak flow velocity, their ratio, and deceleration of early diastolic flow.
- Two-dimensional echocardiography assessed ventricular dimensions and hypertrophy.
Main Results:
- No significant differences in structural parameters were found between HCM subgroups.
- Mitral regurgitation was more prevalent in HCM patients with SAM.
- HCM patients without SAM demonstrated significantly impaired diastolic filling compared to those with SAM and controls.
Conclusions:
- Left ventricular diastolic filling is impaired in HCM patients without SAM.
- Doppler-derived mitral flow velocity indices can identify diastolic dysfunction in HCM.
- The presence or absence of SAM influences diastolic filling patterns in HCM.
Abstract:
Abnormal left ventricular diastolic properties have been described in patients with hypertrophic cardiomyopathy. To evaluate the diastolic filling characteristics of the left ventricle in patients with this disease, pulsed Doppler echocardiography was used to study mitral flow velocity in 17 patients with hypertrophic cardiomyopathy (11 with and 6 without systolic anterior motion of the mitral valve) and 16 age-matched normal subjects. There were no statistically significant differences between patients with hypertrophic cardiomyopathy with and without systolic anterior motion with regard to ventricular septal thickness, left ventricular posterior wall thickness, left ventricular internal dimensions or the extent of hypertrophy evaluated by two-dimensional echocardiography. Mitral regurgitation was detected by Doppler echocardiography in all 11 patients with and in 2 (33%) of the 6 patients without systolic anterior motion of the mitral valve. Early and late diastolic peak flow velocity, the ratio of late to early diastolic peak flow velocity and deceleration of early diastolic flow were measured from Doppler mitral flow velocity recordings. There were no statistically significant differences in these four indexes between the patients with systolic anterior motion and normal subjects. In contrast, the patients with hypertrophic cardiomyopathy without systolic anterior motion showed lower early diastolic peak flow velocity, higher ratio of late to early diastolic peak flow velocity and lower deceleration of early diastolic flow compared with the patients with systolic anterior motion and normal subjects, suggesting impaired left ventricular diastolic filling.(ABSTRACT TRUNCATED AT 250 WORDS)