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Two-dimensional echo Doppler study of congenital disorders of the mitral valve
Insights
Two-dimensional echocardiography (2DE) and Doppler methods effectively diagnose congenital mitral stenosis in children. These imaging techniques reveal specific valve deformities and abnormal blood flow, aiding in accurate diagnosis.
Area of Science:
- Pediatric Cardiology
- Diagnostic Imaging
- Congenital Heart Disease
Background:
- Congenital mitral stenosis is a rare but serious heart defect.
- Accurate diagnosis is crucial for timely intervention.
- Existing diagnostic methods may have limitations in characterizing specific valve anomalies.
Purpose of the Study:
- To evaluate the diagnostic utility of two-dimensional echocardiography (2DE) and Doppler echocardiography for congenital mitral stenosis.
- To define specific echocardiographic features associated with different forms of congenital mitral stenosis.
- To assess the sensitivity of these imaging modalities in pediatric patients.
Main Methods:
- Studied 16 children (2 months to 13 years) with congenital mitral valve deformities.
- Utilized 2DE for detailed valve anatomy and subclassification.
- Employed Doppler echocardiography to assess transmitral blood flow velocities.
- Correlated echocardiographic findings with surgical and postmortem data where available.
Main Results:
- 2DE identified specific anatomical subtypes, including parachute and arcade mitral valves.
- Echocardiograms showed thickened leaflets, shortened chordae, and restricted orifices in affected children.
- Doppler studies revealed significantly increased transmitral inflow velocities compared to controls.
- Seven children demonstrated restricted mitral orifices on short-axis imaging.
Conclusions:
- 2DE provides detailed anatomical subclassification of congenital mitral stenosis.
- Doppler echocardiography effectively quantifies abnormal blood flow patterns.
- Combined 2DE and Doppler echocardiography are sensitive and valuable tools for diagnosing congenital mitral stenosis in children.
Abstract:
To define the use of two-dimensional echocardiography (2DE) and Doppler methods for diagnosis of forms of congenital mitral stenosis, we studied 16 children, age range 2 months to 13 years, with congenital deformities of the mitral valve documented at cardiac catheterization. Thirteen had additional congenital heart defects, most commonly aortic stenosis or aortic coarctation. In eight patients features of mitral valve anatomy were observed and described during cardiac surgery and in one child the anatomy was verified by postmortem examination. 2DE studies allowed anatomic subclassification of 10 valves which had asymmetric or single dominant papillary muscles (parachute) and six which had arcade mitral valve attached by short chords to multiple diminutive papillary muscle heads. All patients' echoes exhibited shortened and thickened mitral chordae and doming of the mitral leaflets during diastole, and seven children had restricted mitral orifices imaged on the short-axis imaging plane. All seven of the patients studied by Doppler echocardiography had increased maximal transmitral inflow velocity (range 111 to 260 cm/sec) greater than the 95% confidence limits for mitral flow velocities in 34 normal children who served as the control group. Our study suggests that 2DE studies, especially when combined with Doppler interrogation, are sensitive for defining forms of congenital mitral stenosis.