The preoperative assessment of patients with a coronary artery fistula requires exact angiographic evaluation of the coronary artery anatomy. A technique of transvenous balloon occlusion angiography of the aorta is described. This can be applied easily in infants with a persisting foramen ovale. Combination of this technique with the so-called "laid-back" aortogram gave excellent visualisation of a fistula between the right coronary artery and the right ventricle. This technique is a major improvement in the angiographic assessment of infants with coronary artery abnormalities and normal cardiac connections.
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