The culmination of Prof. Choudhury‟s research activities has been the development of a novel technique of septation of the aorto-pulmonary window using a fenestrated, unidirectional, valved fabric patch, a novel technique of rechanneling of sinus venosus atrial septal defect with partial anomalous pulmonary venous connection, construction of novel techniques of the modified Blalock-Taussig‟s shunt, laying down the guidelines for candidate selection for one and one-half ventricular repair and for leaving the vertical vein open in patients with obstructive totally anomalous pulmonary venous connection, development of a novel technique of transfer of anomalous left coronary artery from the pulmonary artery using autogenous aortic and pulmonary arterial flaps, development of a novel technique of percutaneous adjustable vertical vein ligature in obstructive totally anomalous pulmonary venous connection, formulation of a new surgical classification of mixed totally anomalous pulmonary venous connection, development of modified button technique for the performance of Bentall‟s procedure, laying down the criteria for diagnosis of postoperative Fontan failure by dynamic radionuclide study and new techniques of tumour thrombectomy from inferior vena cava and right atrium in patients with renal cell carcinoma with inferior vena caval and right atrial extension without cardiopulmonary bypass as well as using cardiopulmonary bypass without circulatory arrest.

Intracardiac repair of Tetralogy of Fallot. Rechanneling of total anomalous pulmonary venous connection Univentricular repair One and one-half ventricular repair Aortic and pulmonary artery histopathology in cyanotic congenital heart diseases Relationship between internal jugular venous oxygen saturation and pump flow rates in children and adults undergoing corrective cardiac surgery under cardiopulmonary bypass Diagnosis of postoperative Fontan failure by dynamic radionuclide studies Histopathology and morphometry of the radial artery in patients undergoing coronary artery bypass grafting Development of small vascular substitutes Histopathological abnormalities of right ventricular outflow tract in patients with tetralogy of Fallot Evaluation of the flow pattern of different types of total cavopulmonary connections by magnetic resonance imaging studies Coronary artery bypass grafting Aortic aneurysm and dissection repairs Creation of a new technique of dual coronary arterial system in anomalous origin of left coronary artery from pulmonary artery. Pericardiectomy for chronic constrictive pericarditis.