Role of two-dimensional echocardiography, pulsed, continuous wave color flow Doppler techniques in the assessment of ventricular septal rupture after myocardial infarction.

Two-dimensional echocardiography, pulsed and continuous wave Doppler techniques were used for the evaluation of 15 consecutive patients (9 men, 6 women; mean age 71 years, range 61 to 79) with ventricular septal rupture due to acute myocardial infarction (7 anterior, 8 posterior). Standard and modified off-axis 2-dimensional echocardiographic views from parasternal, apical and subcostal windows correctly identified this defect in 14 of the 15 patients. Pulsed Doppler echocardiography confirmed the presence of left-to-right-sided shunt by showing a high-velocity, aliased, systolic flow and a low-velocity diastolic flow in the right ventricle in 14 patients. Continuous wave Doppler echocardiography showed a high-velocity systolic and low-velocity diastolic flow signal of left-to-right shunt in 14 patients. Color flow Doppler imaging identified a left-to-right shunt in all 6 patients in whom it was performed. Doppler and 2-dimensional echocardiographic studies missed a small apical septal defect in 1 patient with anteroseptal myocardial infarction. Two-dimensional echocardiography correctly diagnosed right ventricular infarction in all 5 patients with posteroinferior infarction. Ventricular septal rupture and/or left-to-right-sided shunt was confirmed in all 15 patients by the following: surgical inspection in 11, necropsy in 3, left ventricular cineangiography in 5 and right-sided heart catheterization and oximetry data in 13 patients. Data indicate that 2-dimensional echocardiography correctly shows the precise location of septal rupture in most patients after acute myocardial infarction and allows assessment of left and right ventricular infarction and function.(ABSTRACT TRUNCATED AT 250 WORDS)