Prior to joining Medanta as Principal Consultant- Cardiac Surgeon, Dr Shrivastava worked as Senior Consultant Cardiothoracic Surgeon & Head CVTS at Nawaloka Hospital PLC, Colombo from 2007- 2010. Dr Shrivastava has to his credit over 7000 cardiac surgeries, including adult & pediatric cases for heart valve repairs, CABG on beating heart, and a large number of arterial revascularizations including LIMA – RIMA Y grafting, LIMA – Radial "Y" grafting & Radial – Radial "Y" grafting. He led the team that conducted the first double lung transplantation in Sri Lanka, thus creating history.