Hemodynamic Effects of Prophylactic Administration of Vasopressin in Patients Undergoing Off Pump Coronary Artery Bypass Graft Surgery: A Randomized Control Double Blind Interventional Study

Background: Offpump coronary artery bypass grafting (OPCABG) is associated with hemodynamic fluctuations which usually require the use of various vasoactive drugs like norepinephrine and phenylephrine The aim of this study was to evaluate the effect of low dose vasopressin on hemodynamics in patients undergoing Offpump Coronary Artery Bypass Graft Surgery (OPCABG). Methods: Sixty patients undergoing elective Off pump coronary artery bypass grafting (CABG) having triple vessel coronary artery disease (CAD). were randomly divided into two groups: group A (n=30), patients received Vasopressin 0.03 IU/min via infusion pump (diluted in 50 ml syringe) during the LIMA extraction and continued till the end of surgery; group B (n==30), patients received normal saline infusion pump during the LIMA extraction and continued till the end of surgery. The anesthetic technique was the same in both the groups. Hemodynamic parameters were recorded at various time intervals during the surgery. Results: HR, CO and CI were lower and MAP, SVR and SVRI were higher in vasopressin group. CVP was stable with no significant difference in SV and SVV. Conclusion: To achieve better intra operative hemodynamic stability during the triple vascular coronary anastomosis and to cope up with postoperative vasodilatory shock, low dose vasopressin infusion is a safe option.