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Congenital left ventricular inflow obstruction evaluated by two-dimensional echocardiography
Insights
Two-dimensional echocardiography aids in diagnosing congenital heart defects causing left ventricular inflow obstruction. It differentiates mitral valve stenosis from other conditions, improving anatomical diagnosis in children.
Area of Science:
- Pediatric Cardiology
- Echocardiography
- Congenital Heart Disease
Background:
- M-mode echocardiography findings are often similar for various congenital heart diseases causing left ventricular inflow obstruction.
- Accurate anatomical diagnosis can be challenging with M-mode echocardiography alone.
Purpose of the Study:
- To evaluate the utility of two-dimensional echocardiography in diagnosing congenital left ventricular inflow obstruction in children.
- To differentiate between various anatomical causes of left ventricular inflow obstruction.
Main Methods:
- Utilized two-dimensional echocardiography to examine five children with left ventricular inflow obstruction.
- Confirmed diagnoses with cardiac catheterization and surgical findings.
Main Results:
- Two-dimensional echocardiography successfully distinguished mitral valve stenosis (thickened valve, two papillary muscles) from parachute mitral valve deformity (single papillary muscle).
- Mitral valve stenosis cases were differentiated from left atrial membrane obstructions.
- Distinguishing cor triatriatum from supravalvar mitral ring using two-dimensional echocardiography remained challenging.
Conclusions:
- Two-dimensional echocardiography offers superior spatial and anatomical display compared to M-mode.
- It provides valuable information for a more detailed diagnosis of congenital left ventricular inflow obstruction in pediatric patients.
- Further refinement may be needed for differentiating specific intracardiac membrane anomalies.
Abstract:
Several forms of congenital heart disease that cause left ventricular inflow obstruction have similar M-mode findings, and frequently the exact anatomic diagnosis cannot be made by M-mode echocardiography alone. We examined five children with various forms of left ventricular inflow obstruction using two-dimensional echocardiography. The diagnosis was confirmed by cardiac catheterization and surgery in all five patients. In one patient with congenital mitral valve stenosis, a thick mitral valve with two papillary muscles was imaged. This patient was easily distinguished from a second child with parachute deformity of the mitral valve in whom a single papillary muscle arising from the left ventricular apex was seen. These two patients with mitral valve stenosis were easily differentiated from the three patients in whom the left ventricular inflow obstruction was caused by a membrane within the left atrium. The membrane could be seen in several spatial planes; however, we could not distinguish by two-dimensional echocardiography one child who had cor triatriatum from the other two patients who had a supravalvar mitral ring. Because of its spatial anatomic display, the two-dimensional echocardiogram provides information for a more detailed anatomic diagnosis in children with congenital left ventricular inflow obstruction.