Treatment of Postoperative Atrial Fibrillation - Comparison of Amiodarone and Placebo.

Study Overview
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Brief Summary
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Post-operative atrial fibrillation (POAF) is the most common complication encountered after cardiac surgery; reports show POAF to occur in   35% of patients after CABG. Prophylactic use amiodarone was found to be effective, however, due to serious extracardiac adverse effects therapy is probably appropriate just for patients at high risk for POAF. the common practice for management of POAF is treatment with intravenous Amiodarone until return to sinus rhythm, following which the drug is given orally. Our protocol involves continued treatment with amiodarone for 30 day post-discharge from the hospital in a dose of 200mg per day. This protocol is a common practice in many cardiac surgical departments worldwide, nevertheless, it is not evidence-based protocol and it was never examined as such. This study is a randomized placebo controlled trial, to evaluate the requirement for post-discharge treatment with oral Amiodarone.

Detailed Description
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Atrial fibrillation (AF) is the most widespread complication encountered after cardiac surgery, associated with prolonged hospitalization, morbidity, mortality, and an annual cost of more than $1 billion to the American healthcare system. AF has been reported to predict postoperative stroke, congestive heart failure, and late AF among patients undergoing mitral valve surgery. Postoperative AF (POAF) occurs in 62% of patients undergoing combined aortic valve and coronary artery bypass graft (CABG) surgery, in 49% of patients undergoing aortic valve surgery alone, in 42% of patients undergoing mitral valve surgery, and in 32% of patients undergoing CABG surgery alone. These figures are expected to rise in the future, given that the patients undergoing cardiac surgery are getting elder and that the incidence of AF in the general population is markedly age-dependent. POAF peak incidence occurs on the 2nd and 3rd postoperative days (PODs). Seventy percent of patients develop this arrhythmia before the end of the 4th POD and 94% before the end of the 6th. Although generally well-tolerated and seen as a temporary problem related to surgery, POAF can be life-threatening, particularly in elderly patients and those with left ventricular dysfunction. Recent guidelines for the prevention and management of POAF were jointly published in 2006 by the American College of Cardiology, the American Heart Association (AHA), and the European Society of Cardiology. These guidelines recommended (i) preoperative treatment with an oral beta-blocker drug for prevention of POAF as a class IA indication, and (ii) preoperative administration of amiodarone for patients at a high risk for POAF as a class IIA indication. Amiodarone is associated with several complications, both cardiac, and extracardiac; among the cardiac complications, it is predominantly related to increased risk of bradycardia and hypotension, particularly when (i) administered intravenously, (ii) using average daily doses exceeding 1 g, and (iii) initiating prophylaxis during the postoperative period.45 Among the most severe extracardiac complications, amiodarone is associated with thyroid toxicity, lung fibrosis, and corneal damage, which may be aggravated by the drug's delayed onset of action (2 - 3 days) and long elimination half-life time (up to 6 months). Currently the common practice for management of POAF is treatment with intravenous Amiodarone until return to sinus rhythm, following which the drug is given orally. Our protocol involves continued treatment with amiodarone for 30 day post-discharge from the hospital in a dose of 200mg per day. This protocol is a common practice in many cardiac surgical departments worldwide, nevertheless, it is not evidence-based protocol and it was never examined as such. This study is a randomized placebo controlled trial, to evaluate the requirement for post-discharge treatment with oral Amiodarone.

Official Title
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Treatment of Postoperative Atrial Fibrillation - Comparison of Amiodarone and Placebo.

Conditions
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Atrial Fibrillation

Intervention / Treatment
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* Drug: Amiodarone
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All post-cardiac surgery patients who developed a hemodynamically stable postoperative atrial fibrillation and returned to sinus rhythm with intravenous amiodarone tretament. Exclusion Criteria: Post-cardiac surgery patients who developed a non- hemodynamically stable postoperative atrial fibrillation. Patients with chronic and/or paroxysmal atrial fibrillation and/or known other cardiac arrhythmia or conduction disturbance. Patients with pacemakers. Patients with lactose intolerance

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 100 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Placebo Comparator: Placebo<br>Will receive 30 days treatment with oral placebo of 200mg | Drug: Placebo<br>* Will receive 30 days treatment with oral placebo of 200mg<br>|
| Active Comparator: Interventional<br>Will receive 30 days treatment with oral Amiodarone of 200mg | Drug: Amiodarone<br>* Will receive 30 days treatment with oral amniodarone of 200mg<br>* Other names: amiodacore;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Postoperative atrial fibrillation | Post-discharge monitoring with a continous loop-recorder type of ECG monitoring device named CardioR will be provided for all participants. The device will continuously record and transmit ECG monitoring to a dedicated monitoring company. All arrhythmias will be recorded and reported. | 30 days after discharge | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Post-discharge return to admission | Any return to admission will be recorded and reported. | 30 days after discharge |