This journal only 2005, Number 2 Rev Mex Cardiol 2005; 16 (2) Patterns of pulmonary blood flow after superior cavopulmonary anastomosis (Glenn shunt) Parra-Bravo JR, Hernández-Villalón E, Josefa GH, Rojas-Bautista JC, Romero-Navarrete MA, Beirana-Palencia LG, Girón-Vargas AL, Zepeda-Sanabria JR, Vera-Canelo M Full text How to cite this article Language: Spanish References: 23 Page: 87-93 PDF size: 119.74 Kb. Key words: Lung perfusion, bidirectional cavopulmonary anastomosis (Glenn shunt), congenital heart disease. ABSTRACT Objective: To examine the effects of bidirectional cavopulmonary anastomosis (Glenn shunt) on pulmonary blood flow distribution in a group of patients who underwent the procedure as an intermediate stage before the Fontan procedure. Patients and methods: Perfusion lung scans were preformed in 23 patients with a functional single ventricle with pulmonary atresia who underwent Glenn shunt anastomosis as an intermediate stage previous to the Fontan procedure, to determine the distribution of pulmonary blood flow. Follow-up studies included echocardiography in every patient and angiocardiography in five of them. Results: Perfusion lung scans showed symmetric distribution of pulmonary blood flow in 17% of the patients, whereas an asymmetric distribution of pulmonary blood flow was found in 83% of the patients. Overall there was a better distribution of pulmonary blood flow toward the right lung. The proximal diameter of the main pulmonary arteries showed a significant difference between them. Angiocardiography did not show an increase in mean pulmonary arterial pressure except in two patients. 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