Echocardiographic localization of interatrial baffle after Mustard operation for dextrotransposition of the great arteries.

The position of the interatrial baffle was determined by echocardiography in 11 patients with complete transposition of the great arteries who had undergone the Mustard operation. The location of the interatrial baffle and the newly created systemic venous atrium and the pulmonary venous atrium behind the pulmonary arterial root was established by echocardiographic contrast studies during cardiac catherization. Angiographic analysis indicated that the segments of the systemic and pulmonary venous atria seen behind the pulmonary arterial root in the echocardiogram were, respectively, the superior limb of the systemic venous atrium and the posterior segment of the pulmonary venous atrium. The area of mitral-pulmonary valve continuity in the echocardiogram was used as a reference point for dimensional measurements of the systemic and pulmonary venous atria. It is suggested that longitudinal measurements of these structures by echocardiogram may help evaluate their growth in size. Fine to coarse fibrillatory movements of the atrioventricular valves and, more frequently, of the mitral valve were seen in the majority of patients.