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Previous Volume 344:1043-1051 April 5, 2001 Number 14 Next

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ABSTRACT

Background In patients with atrial fibrillation that is refractory to drug therapy, radio-frequency ablation of the atrioventricular node and implantation of a permanent pacemaker are an alternative therapeutic approach. The effect of this procedure on long-term survival is unknown.

Methods We studied all patients who underwent ablation of the atrioventricular node and implantation of a permanent pacemaker at the Mayo Clinic between 1990 and 1998. Observed survival was compared with the survival rates in two control populations: age- and sex-matched members of the Minnesota population between 1970 and 1990 and consecutive patients with atrial fibrillation who received drug therapy in 1993.

Results A total of 350 patients (mean [±SD] age, 68±11 years) were studied. During a mean of 36±26 months of follow-up, 78 patients died. The observed survival rate was significantly lower than the expected survival rate based on the general Minnesota population (P<0.001). Previous myocardial infarction (P< 0.001), a history of congestive heart failure (P=0.02), and treatment with cardiac drugs after ablation (P= 0.03) were independent predictors of death. Observed survival among patients without these three risk factors was similar to expected survival (P=0.43). None of the 26 patients with lone atrial fibrillation died during follow-up (37±27 months). The observed survival rate among patients who underwent ablation was similar to that among 229 controls with atrial fibrillation (mean age, 67±12 years) who received drug therapy (P=0.44).

Conclusions In the absence of underlying heart disease, survival among patients with atrial fibrillation after ablation of the atrioventricular node is similar to expected survival in the general population. Long-term survival is similar for patients with atrial fibrillation, whether they receive ablation or drug therapy. Control of the ventricular rate by ablation of the atrioventricular node and permanent pacing does not adversely affect long-term survival.

Source Information

From the Division of Cardiovascular Diseases and Internal Medicine (C.O., A.J., P.A.F., P.J.P., T.M.M., R.F.R., M.A.L., D.L.P., B.J.G., S.C.H., W.-K.S.) and the Section of Biostatistics (D.O.H.), Mayo Clinic, Rochester, Minn.

Address reprint requests to Dr. Shen at the Mayo Clinic, 200 First St. SW, Rochester, MN 55905.

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