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Prophylaxis to Reduce Postoperative Atrial Fibrillation in Cardiac Surgery

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ClinicalTrials.gov Identifier: NCT00953212
Recruitment Status : Completed
First Posted : August 6, 2009
Last Update Posted : May 11, 2012
Information provided by (Responsible Party):

August 5, 2009
August 6, 2009
May 11, 2012
August 2009
January 2012   (Final data collection date for primary outcome measure)
Occurence of post-operative atrial fibrillation requiring treatment after open heart surgery [ Time Frame: 5 postoperative days ]
Same as current
Complete list of historical versions of study NCT00953212 on ClinicalTrials.gov Archive Site
  • Mortality [ Time Frame: 30 days ]
  • Hospital Length of Stay [ Time Frame: 30 days ]
  • ICU Length of Stay [ Time Frame: 30 days ]
  • Stroke [ Time Frame: 30 days ]
  • Low Output Heart Failure [ Time Frame: 30 days ]
  • Postoperative Vasoplegia [ Time Frame: 30 days ]
  • Respiratory Failure requiring reintubation [ Time Frame: 30 days ]
  • Bradycardia necessitating permanent pacemaker placement [ Time Frame: 30 days ]
  • Acute Kidney Injury [ Time Frame: 30 days ]
  • Readmission to ICU for treatment of atrial fibrillation [ Time Frame: 30 days ]
  • Readmission to hospital for treatment of atrial fibrillation [ Time Frame: 30 days ]
Same as current
Not Provided
Not Provided
Prophylaxis to Reduce Postoperative Atrial Fibrillation in Cardiac Surgery
A Randomized Controlled Trial to Compare Prophylaxis With Oral Ascorbic Acid, Oral Amiodarone or Both in Combination With Beta Blockers to Reduce Postoperative Atrial Fibrillation After Cardiac Surgery
Atrial Fibrillation (AF) is a common postoperative complication of cardiac surgery, occuring in approximately 25-30% of coronary artery bypass graft (CABG) patients and 35-40% of heart valve repair/replacement patients. Efforts to decrease the high rates of AF have not made great inroads to the problem. The current standard of care is the use of preoperative and postoperative beta blockers. We propose to compare the use of prophylactic oral ascorbic acid with and without prophylactic oral amiodarone, in combination with oral beta blockers, for the prevention of atrial fibrillation after open heart surgery. The hypothesis is that either drug, or a combination of the two drugs, will be superior and safe when compared to beta blockers alone.

Atrial fibrillation is a common complication of cardiac surgery which is associated with increased morbidity, length of stay and cost. Efforts to mitigate this problem with beta blockers and amiodarone have been met with limited success. Observational data suggests that prophylactic amiodarone has been helpful in decreasing the incidence of AF as well as increasing its ease of management. The opportunity to use ascorbic acid for AF prophylaxis is attractive because of its low side effect profile, wide acceptance and low cost.

We have designed a prospective, randomized, controlled trial using a 2 X 2 factorial design to determine whether prophylactic ascorbic acid alone, ascorbic acid with amiodarone, or amiodarone alone, when given along with beta blockers will decrease the incidence of postoperative AF in adult cardiac surgery in all comers as compared with beta blockers alone.

Patients will be randomized into four groups, A, B, C, and D. All groups will receive beta blockers, Group A will receive beta blockers, ascorbic acid, and amiodarone, Group B will receive ascorbic acid and Beta blockers, Group C will receive amiodarone and beta blockers and Group D will receive only beta blockers.

Success of randomization will be assessed by comparing treatment groups with respect to baseline characteristics, using t-tests or their nonparametric equivalent (as appropriate) for continuous variables and chisquare tests or Fisher's exact tests for categorical variables. The primary hypotheses of the effects of ascorbic acid and amiodarone on incidence of atrial fibrillation will be tested using chisquare tests for differences in proportions. No adjustment will be made for multiple comparisons since both hypotheses are pre-specified. We will use exploratory analyses including stratification to assess for the possibility of effect modification between ascorbic acid and amiodarone. If an interaction is suggested by these analyses, we will use logistic regression with a cross-product term as a formal statistical test for interaction.

Phase 3
Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: Double (Investigator, Outcomes Assessor)
Primary Purpose: Prevention
  • Atrial Fibrillation
  • Atrial Flutter
  • Drug: beta blockers
    metoprolol 25mg by mouth every 6 hours
    Other Names:
    • Lopressor
    • Toprol XL
  • Drug: amiodarone
    amiodarone 600mg by mouth evening before surgery amiodarone 600mg by mouth morning of surgery amiodarone 400mg by mouth every 12 hours for 3 days postoperatively
    Other Name: Cordarone
  • Drug: ascorbic acid
    ascorbic acid 2,000mg by mouth evening before surgery ascorbic acid 2,000mg by mouth morning of surgery ascorbic acid 1,000mg by mouth every 12 hours for 5 postoperative days
    Other Name: vitamin C
  • Active Comparator: Group A
    Beta Blockers, Ascorbic Acid and Amiodarone
    • Drug: beta blockers
    • Drug: amiodarone
    • Drug: ascorbic acid
  • Active Comparator: Group B
    Beta Blockers and Ascorbic Acid
    • Drug: beta blockers
    • Drug: ascorbic acid
  • Active Comparator: Group C
    Beta Blockers and Amiodarone
    • Drug: beta blockers
    • Drug: amiodarone
  • Active Comparator: Group D
    Beta Blockers alone
    Intervention: Drug: beta blockers
Not Provided

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
February 2012
January 2012   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • adults (18 years of age or older)
  • all comers for elective or urgent open heart surgery ( CABG, Valve repair or replacement, Combined CABG/Valves, CABG/other, Other)

Exclusion Criteria:

  • patients who refuse to participate
  • patients with a history of atrial fibrillation or atrial flutter
  • pediatric patients (under 18 years of age)
  • Emergency surgery
  • patients with contraindications to study medications
  • patients with untreated thyroid disease, hepatic failure, pregnancy
Sexes Eligible for Study: All
18 Years and older   (Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
United States
Not Provided
Not Provided
Peter C. Donovan, Maine Medical Center
Maine Medical Center
Not Provided
Principal Investigator: Peter C Donovan, PA-C, MHS Maine Medical Center
Study Chair: Robert S Kramer, M.D. Maine Medical Center
Maine Medical Center
May 2012

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP