OBJECTIVE: To determine the incidence of pulmonary arteriovenous fistulae (PAVFs) after the bidirectional Glenn operation and the possible independent variables that could influence their appearance; to confirm the use of microbubble contrast echocardiography for the detection of PAVFs; and to test the sensitivity and specificity of pulmonary angiography. METHODS: From March 1990 to December 1995, 59 patients were operated upon. Their ages ranged from 2 to 132 months (mean, 32.7± 33.6). All underwent clinical and laboratory examinations, microbubble contrast echocardiography, and cardiac catheterization. RESULTS: Of the 54 survivors, 20 (37.0%) had PAVFs. The ages ranged from 2 to 132 months (mean, 29.6±29.7). In 13 (65%) patients, the bidirectional Glenn operation was performed on the right-hand side; in 2 (10.0%) patients, on the left-hand side; and in 5 (25%) patients, it was bicaval. The follow-up of the patients with PAVFs ranged from 4 to 84 months (mean, 32.4±21.65), and that of the patients without fistulae ranged from 1 to 77 months (mean, 23.4±18.8), with statistical significance (P=0.04). The PAVFs were diagnosed by use of microbubble contrast echocardiography in 20 cases; the examination was considered positive when return of microbubbles through the pulmonary veins was detected. PAVFs were observed in the right lung in 9 (45%) patients, in the left lung in 3 (15%) patients, and in both lungs in 8 (40%) patients. The pulmonary angiography showed alterations compatible with PAVFs in 16 patients, with a sensitivity of 80%. CONCLUSION: The incidence of PAVFs after the bidirectional Glenn operation was high (37%). The time interval elapsed after the bidirectional Glenn operation was the only independent variable that significantly correlated with the appearance of PAVFs (P=0.04). Microbubble contrast echocardiography was the standard diagnostic method. The pulmonary angiography showed a sensitivity of 80.0%.
pulmonary arteriovenous fistulae; bidirectional Glenn operation; microbubble contrast echocardiography
