Hemodynamic Evaluation of pre. and Postoperative Cardiac Imaging Scan in Congenital Heart Disease

ABSTRACT

Recently, the radionuclide angiocardiographic study had been enhanced by rapid development of gamma scintillation camera and computer system, and utilized as noninvasive diagnostic measurement of heart disease. We obtained the following results by the radionuclide angiocardiography with human serum albumin tagged with 99m-Technetium from two groups. One of them was congenital heart disease group(n=50, ventricular septal defect 20, atrial septal defect 6, pulmonary stenosis 2, tetralogy of Fallot 10, truncus arteriousus 1, transposition of great artery 1, patent ductus arteriosus 10) operated from Oct. 1984 to Jun. 1985, and the other was the normal human group(n=10) as control. 1) In the cases of left to right shunt, Qp/Qs values were calculated by th gamma variet fit curve. The preoperative values ranged from 1.441-3.00, the postoperative values were normal among all the patients except one(atrial septal defect, postop. Qp/Qs 2.335). 2) In the cases of right to left shunt, Qp/Qs values showed no apparent change between pre. andpostoperative period, possibly due to still remained collateral circulation and hardly obtained lower value(less than QP/QS 1.0) by computer system, But the double peak curve was noticed in the left ventricular time activity curve, which indicate right to left shunt, disappeared after the surgery, suggesting shunt closed. 3) The ejection fraction of left ventricle was obtained from the congential cardiac patients, ranged 0.38-0.65 before the surgery and 0.41-0.67 after the surgery. 4) The circulation time calculated from the first-pass radionuclide angiocardiography, ranged normal in the most congenital cardiac patients, but prolonged in the severe pulmonary hypertension.