Abstract
BACKGROUND: Frequent idiopathic premature ventricular complexes (PVC) are associated with a reversible form of cardiomyopathy. The effect of frequent PVCs on left ventricular function has not been evaluated in post-infarction patients. OBJECTIVE: This study sought to evaluate the value of post-infarction PVC ablation and possible determinants of a reversible cardiomyopathy. METHODS: Thirty consecutive patients (24 men, age 61 +/- 12, left ventricular ejection fraction [LVEF] 0.36 +/- 0.12) with remote myocardial infarction referred for implantable cardioverter-defibrillator (ICD) implantation for primary prevention of sudden death or for management of symptomatic ventricular tachycardia or PVCs were evaluated. Fifteen patients with a high PVC burden (>or=5% of all QRS complexes on 24-h Holter monitor) underwent mapping and ablation of PVCs before ICD implantation. The remaining 15 patients served as a control group. LVEF was assessed by echocardiography, and scar burden was assessed by cardiac magnetic resonance imaging with delayed enhancement (DE-MRI) in both groups. RESULTS: PVC ablation was successful in 15 of 15 patients and reduced the mean PVC burden from 22 +/- 12% to 2.6 +/- 5.0% (P <.001). After the procedure, LVEF increased significantly from 0.38 +/- 0.11 to 0.51 +/- 0.09 in the PVC ablation group (P = .0001). In the control group, LVEF remained unchanged within the same time frame (0.34 +/- 0.14 vs. 0.33 +/- 0.15; P = .6). Patients with frequent PVCs had a significantly smaller scar burden by DE-MRI compared with control patients. Five of the patients with frequent PVCs underwent ICD implantation. CONCLUSION: Post-infarction patients with frequent PVCs may have a reversible form of cardiomyopathy. DE-MRI may identify patients in whom the LVEF may improve after ablation of frequent PVCs.