Digital subtraction angiography in patients with transposition of the great arteries after surgical repair.

Digital subtraction angiography was used for postoperative evaluation of seven patients who underwent the Senning procedure for repair of d-transposition of the great arteries. Their ages ranged from 2.5 to 3 years. The patients were premedicated with methohexital (25 mg/kg rectally), and 0.3 to 0.4 ml/kg of diatrizoate was injected into a peripheral vein through a plastic needle. Images were obtained on a Technicare DR-960 or Diasonics DA 100 digital angiographic unit at four frames per second using 256 X 256 matrix and a 6 inch (15.24 cm) field size. In all patients, the venous systems, cardiac chambers and great arteries were well visualized. Two patients had obstruction of the superior vena cava with a dilated azygos vein draining into the inferior vena cava. One patient had severe obstruction of the left pulmonary artery. Digital subtraction angiography is safe and easy to perform and appears to be a valuable alternative method for evaluating patients after surgical repair of transposition of the great arteries. The small amount of contrast material required and the low radiation dose make it attractive for use in children.