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M-mode echocardiographic findings in children with idiopathic restrictive cardiomyopathy
Insights
M-mode echocardiography effectively diagnoses pediatric restrictive cardiomyopathy by identifying an enlarged left atrium and abnormal diastolic function. This noninvasive method offers a specific diagnostic tool for this rare pediatric heart condition.
Area of Science:
- Pediatric Cardiology
- Cardiovascular Imaging
- Echocardiography
Background:
- Primary idiopathic restrictive cardiomyopathy is a rare but serious condition in children.
- Accurate and early diagnosis is crucial for effective management.
- Noninvasive diagnostic methods are highly desirable in pediatric populations.
Purpose of the Study:
- To evaluate the utility of M-mode echocardiography in diagnosing primary idiopathic restrictive cardiomyopathy in pediatric patients.
- To identify specific M-mode echocardiographic findings indicative of restrictive cardiomyopathy in children.
Main Methods:
- M-mode echocardiography was performed on five pediatric patients (ages 4-15) diagnosed with restrictive cardiomyopathy.
- A control group of 12 healthy children was included for comparison.
- Cardiac catheterization was used as the gold standard for diagnosis.
Main Results:
- Patients consistently showed an enlarged left atrium (>40 mm).
- Abnormalities in left ventricular diastolic function were observed, including prolonged isovolumic relaxation time.
- Decreased percent relaxation of the left ventricular posterior wall endocardium was noted compared to controls.
Conclusions:
- M-mode echocardiography is a useful and specific noninvasive tool for diagnosing pediatric restrictive cardiomyopathy.
- Key echocardiographic indicators include left atrial enlargement and impaired diastolic function.
- This imaging modality aids in the early detection of restrictive cardiomyopathy in children.
Abstract:
The M-mode echocardiographic findings in five pediatric patients, ages 4-15 years, with primary idiopathic restrictive cardiomyopathy, diagnosed by cardiac catheterization, and of 12 normal children (control group) are presented. The M-mode echocardiographic findings in patients with restrictive cardiomyopathy were (1) normal left and right ventricular end-diastolic dimension, (2) normal left ventricular posterior wall and interventricular septal thickness (three patients) or mild concentric hypertrophy (two patients), (3) normal opening and closing velocity of the mitral valve, (4) consistently enlarged left atrium (more than 40 mm) in all, and (5) right ventricular systolic time intervals compatible with pulmonary artery hypertension. The left ventricular ejection phase parameters (systolic time intervals, shortening fraction, and mean velocity of circumferential fiber shortening) were normal. Left ventricular relaxation phase parameters (diastolic function) were abnormal. The isovolumic relaxation time index was prolonged, 68 +/- 40 ms (+/- SD), in the study group as compared with 11 +/- 6 ms (+/- SD) in the control group (P less than 0.001). Percent relaxation of left ventricular posterior wall endocardium at 50% of diastole was decreased, 58 +/- 4% (+/- SD), in the study group as compared with 85 +/- 6% (+/- SD) in the control group (P less than 0.005). We conclude that M-mode echocardiography provides a relatively useful and specific noninvasive method for the diagnosis of primary restrictive cardiomyopathy in pediatric patients.