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Coronary artery bypass grafting in patients with ventricular fibrillation
I L Kron1, B B Lerman, D E Haines
1Department of Surgery, University of Virginia Medical Center, Charlottesville 22908.
Insights
Coronary artery bypass grafting for cardiac arrest survivors with ventricular fibrillation is unpredictable. Postoperative electrophysiological evaluation is crucial to determine the procedure's success in managing these complex cardiac patients.
Area of Science:
- Cardiology
- Cardiac Surgery
- Electrophysiology
Background:
- The role of coronary artery revascularization in cardiac arrest survivors is debated.
- Response to revascularization varies based on the underlying arrhythmia, with ventricular fibrillation (VF) poorly characterized.
Purpose of the Study:
- To assess the efficacy of coronary artery bypass grafting (CABG) in patients experiencing cardiac arrest due to ventricular fibrillation.
- To characterize the outcomes of CABG in this specific patient population.
Main Methods:
- Retrospective analysis of 8 patients who underwent CABG for cardiac arrest caused by VF.
- All patients had significant coronary artery disease and prior myocardial infarction with wall motion abnormalities.
- Postoperative electrophysiological studies were conducted.
Main Results:
- Five out of eight patients experienced no spontaneous or inducible arrhythmias post-CABG.
- Three patients had recurrent, spontaneous VF episodes unrelated to ischemia.
- Clinical factors did not reliably predict the response to revascularization.
Conclusions:
- Coronary artery revascularization outcomes in cardiac arrest survivors with VF are unpredictable.
- Comprehensive postoperative electrophysiological assessment is essential to evaluate the success of CABG in these patients.
Abstract:
The role of coronary artery revascularization in the management of survivors of cardiac arrest remains controversial. Patients with sustained monomorphic ventricular tachycardia rarely respond to revascularization, but the response of patients with ventricular fibrillation as their basic arrhythmia has not been characterized. Coronary artery bypass grafting was performed in 8 patients with a history of cardiac arrest known to be caused by ventricular fibrillation without preceding sustained monomorphic ventricular tachycardia. All patients had critical double-vessel or triple-vessel coronary artery disease, and 7 of 8 had wall motion abnormalities from a prior myocardial infarction. After successful operation, 5 patients had no spontaneous arrhythmias and no inducible arrhythmias at a postoperative electrophysiological study. Three patients, however, had spontaneous, recurrent episodes of ventricular fibrillation unassociated with recurrent ischemia. Clinical factors were not useful predictors of response. The effect of coronary artery revascularization in patients with ventricular fibrillation is unpredictable, and full postoperative electrophysiological evaluation is necessary to judge the success of the procedure.