Related Experiment Videos
Echocardiographic study on hypertrophic cardiomyopathy
Insights
Echocardiography reveals key features of hypertrophic cardiomyopathy (HCM), including asymmetric septal hypertrophy and abnormal diastolic function. Systolic anterior mitral valve movement is specific to obstructive HCM, aiding diagnosis.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition.
- Echocardiography is a primary diagnostic tool for cardiovascular diseases.
Purpose of the Study:
- To investigate echocardiographic findings in hypertrophic cardiomyopathy (HCM).
- To differentiate between obstructive and nonobstructive HCM using echocardiography.
- To assess left ventricular diastolic properties in HCM patients.
Main Methods:
- Echocardiographic study of 21 patients with hypertrophic cardiomyopathy (HCM).
- Analysis of interventricular septum thickness and septal to posterior wall thickness ratio.
- Evaluation of systolic anterior movement of the mitral valve (SAM).
- Assessment of left ventricular diastolic indices: DDR, mPWVd, D/S ratio, mRFR.
Main Results:
- Asymmetric septal hypertrophy was present in all HCM cases (septal thickness ≥1.4 cm).
- Systolic anterior mitral valve movement (SAM) was observed exclusively in obstructive HCM.
- Abnormal left ventricular diastolic indices (DDR, mPWVd, D/S ratio, mRFR) were noted in HCM patients.
- Reduced DDR correlated with abnormal atrio-ventricular flow patterns (r=0.79).
- mRFR correlated with negative maximum dp/dt (r=0.68), indicating impaired diastolic function.
Conclusions:
- Echocardiography effectively identifies hypertrophic cardiomyopathy (HCM) hallmarks.
- Systolic anterior mitral valve movement (SAM) is a specific indicator of obstructive HCM.
- Echocardiography provides valuable insights into left ventricular diastolic properties in HCM.
- Echocardiography is a crucial tool for evaluating early diastolic function in HCM.
Abstract:
Echocardiographic study was performed on 21 cases with hypertrophic cardiomyopathy (HCM), 10 obstructive and 11 nonobstructive. Asymmetric septal hypertrophy was demonstrated in both obstructive and nonobstructive HCM. In all cases of HCM studied, the thickness of the interventricular septum was 1.4 cm or more (1.4-3.7 cm) and the ratio of septal to left ventricular posterior wall thickness was 1.4 or more (1.4-3.2). A systolic anterior movement of the mitral valve (SAM) was observed in obstructive cases only and characterized by a large backward component in late systole and an extreme approximation to the interventricular septum at its peak. Patients with HCM also showed abnormal echocardiographic indices of the left ventricular diastolic properties, such as the rate of diastolic descent of the mitral valve (DDR), mean diastolic posterior wall velocity (mPWVd), D/S ratio and mean rapid filling rate (mRFR). DDR correlated well with the ratio of rapid filling to total filling volume, rapid filling fraction, (r = 0.79, p less than 0.001), suggesting that reduced DDR in HCM was related with an abnormal left atrio-ventricular flow pattern. A significant correlation was also observed between mRFR and negative maximum dp/dt derived from the first derivative curve of the left ventricular pressure (r = o.68, p less than 0.005). Thus echocardiography was proved to be a valuable means for investigation of the left ventricular properties during early diastole.