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[Detection and localization of the ventricular septum defect using color Doppler echocardiography. Sensitivity,
C F Wippermann1, D A Redel, T Menschik
1Universitäts-Kinderklinik Bonn.
Insights
Color-Doppler echocardiography effectively diagnoses ventricular septal defects (VSD) by visualizing blood flow patterns. Derived criteria improve accuracy, achieving high sensitivity and specificity in detecting VSD in children.
Area of Science:
- Cardiovascular imaging
- Pediatric cardiology
- Diagnostic techniques
Context:
- Ventricular septal defects (VSD) are common congenital heart abnormalities.
- Accurate diagnosis is crucial for appropriate management.
- Color-Doppler echocardiography offers a non-invasive method for VSD assessment.
Purpose:
- To establish diagnostic criteria for VSD using color-Doppler echocardiography based on interventricular pressure gradients.
- To evaluate the sensitivity and specificity of these derived criteria in a large patient cohort.
Summary:
- Part 1 defined criteria: a "turquois-yellow jet" for gradients >15 mm Hg, and transseptal flow for equal pressures.
- Part 2 validated these criteria in 234 patients, achieving 98.3% sensitivity and 99.1% specificity for VSD detection.
- Diagnostic challenges persist for small VSDs and those with equal ventricular pressures, particularly multiple defects.
Impact:
- The study provides refined, pressure-gradient-dependent criteria for VSD diagnosis via color-Doppler echocardiography.
- High diagnostic accuracy demonstrated supports its clinical utility in pediatric cardiology.
- Identifies specific scenarios requiring careful interpretation or further investigation.
Abstract:
In part 1 of this study 50 healthy children and 56 patients with known VSD were examined by color-Doppler-echocardiography to derive criteria for the diagnosis of a VSD by this technique. Using a defined Nyquist velocity the healthy children showed a monochrome ventricular bloodflow pattern. In patients with VSD and an interventricular pressure gradient greater than 15 mm Hg a turquois-yellow jet could be seen additionally in the ventricle with the lower pressure. The same pattern could be observed within the defect itself, except for four patients, in whom the VSD could not be visualized by two-dimensional echocardiography. In these patients, however, the VSD could be localized by tracing the jet to the septal endocardium. In patients with equal left and right ventricular pressures a monochrome transseptal bloodflow could be seen. Its color pattern was not significantly different from the normal bloodflow pattern. In these cases it was difficult to diagnose a small VSD, if the defect itself could not be visualized. Thus, the following criteria for the diagnosis of a VSD by color-Doppler-echocardiography were derived depending on the interventricular pressure gradient: 1) Interventricular pressure gradient greater than 15 mm Hg: visualization of the VSD-jet including its origin at the septal endocardium. 2) Equal left and right ventricular pressures: visualization of the VSD as echo drop-out as well as a transseptal bloodflow. Using these criteria, sensitivity and specificity of color-Doppler-echocardiography in the detection of VSD were evaluated in part II; 234 consecutive patients, of which 119 had a VSD, were examined. All had undergone cardiac catheterisation. A high sensitivity of 98.3% and a specificity of 99.1% were found. Diagnostic problems remain in patients with a small VSD and also in patients with equal left and right ventricular pressures. In particular, multiple VSD with equal left and right ventricular pressures are difficult to visualize completely, as compared to cases with significant interventricular pressure gradients.