Coronary artery fistula: estimation of shunt using 99m Tc-albumin particles.

A 60-year-old man presented with complaints on angina pectoris and was found to have a coronary artery fistula between his left main truck and main pulmonary artery. Particles of 99m Tc-Albumin were injected in the ostium of the left coronary artery, and differential radioactive counts were injected in the ostium of the left coronary artery, and differential radioactive counts were obtained over both lung fields and myocardium. The degree of left to right shunt was calculated at 56% of total left coronary artery flow. The patient underwent ligation of the fistula without any complications. This case report represents a new application of myocardial radioisotopic scanning.