NONINVASIVE DIAGNOSIS AND ASSESSMENT OF VENTRICULAR SEPTAL DEFECT BY DOPPLER ULTRASOUND

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Abstract
The presence of ventricular septal defect (VSD) can be diagnosed noninvasively by Doppler ultrasound. Care must be taken to distinguish between VSD and infundibular pulmonary stenosis. VSD was easily differentiated from other cardiac lesions. In 55% of the patients a pressure drop across the VSD, comparable to that present, could be calculated from maximal velocity recorded. In the remaining patients velocity and pressure drop were underestimated, probably due to a too large angle between ultrasound beam and velocity. Pulmonary artery systolic pressure was correctly estimated from Pc-To [pulmonary closure-tricuspid opening interval] interval and heart rate, and .**GRAPHIC**. [right ventricular preejection and ejection periods] indicated whether normal or raised diastolic pressure was present in most patients.