Effect of Intraoperative Loading Dose of Amiodarone for Prophylaxis Against Atrial Fibrillation in Patients with Rheumatic Valvular Heart Disease Undergoing Valve Replacement Surgery

Abstract

Background: Atrial Fibrillation (AF) is the most common arrhythmia occurring after cardiac surgery and its peak incidence is between second or third postoperative day. It occurs in 40% to 50% of patients after valve surgery alone or combined valve and CABG surgery respectively. Among all the anti-arrhythmic drugs evaluated for AF, amiodarone has shown the most promising results with successful conversion and maintenance of normal sinus rhythm achieved in 50%–70% of patients.
 Methods: Sixty diabetic patients purposively selected who underwent isolated off pump coronary artery bypass procedure in NICVD. Group A – 30 patients receiving loading dose of amiodarone intra-operatively before establishment of CPB during valve replacement surgery and Group B- 30 patients without receiving loading dose of amiodarone intra-operatively during valve replacement surgery. Incidence of atrial fibrillation in postoperative period was evaluated.
 Results: Atrial fibrillation was observed in 8 (26.7%) patients in group A and 18 (60%) patients in group B (p=0.009). Ventricular tachycardia developed in 6.7% patients in group B and none in group A (p=0.47). Mean duration of ICU stay was 2.04±0.30 days in Group A and Group B was 2.98±0.77 days (p=0.03). Mean duration of post-operative stay was 7.20±0.66 days in Group A and Group B was 7.85±0.60 days (p=0.10).
 Conclusion: A single intra operative dose of intravenous amiodarone increases the incidence of conversion of AF to normal sinus rhythm. When AF persisted, use of amiodarone reduces the frequency of need for cardioversion and the energy required for it.
 Cardiovasc. j. 2020; 12(2): 102-108

Comparing the Effect of Perioperative Amiodarone and Magnesium Sulphate Combination with Magnesium Sulphate for Prevention of Cardiac Dysrhythmias in Open Heart Surgeries: A Quasi-Experimental Study

“…In the amiodarone group, ventricular tachycardia manifested in 6.7% of patients and atrial fibrillation was identified in 26.7% of patients. 13 Sasa et al explained that in patients who received amiodarone in the post-operative period the incidence of AF was reduced. 16 According to Atreya et al and Thanavero et al, patients receiving peri-operative amiodarone had reduced risk of atrial arrhythmias and AF than those without prophylactic treatment.…”