Cardiac Drugs Requirement During Off-Pump Coronary Artery Bypass (OPCAB) Surgery- A Comparison Between Combined High Thoracic Epidural Anaesthesia (HTEA) With GA and GA Alone. Cardiovasc. j. 2010, 3 (1), 7-10. https://doi.org/10.3329/cardio.v3i1.6420.