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Figure 2 The analysis of left ventricular ejection fraction (LVEF) (A), left ventricular end-diastolic internal dimension (LVDd) (B), left ventricular end-systolic internal dimension (LVDs) (C), degree of mitral regurgitation (MR) (D), and right ventricular internal dimension (RVD) (E) by echocardiogram, and cardiothoracic ratio (CTR) (F) by chest radiography before (dotted bars) and 1 day (gray bars) or 6 to 12 months after (solid bars) radiofrequency catheter ablation (RFA). Before RFA and one day after RFA, a subgroup of patients with frequent (>20%) premature ventricular complexes (PVC) demonstrated significantly reduced LVEF, enlarged LVDd and LVDs, and increased MR and CTR as compared to the subgroup with rare (<20%) PVC. However, all of these abnormalities seen in the upper group before RFA were completely reversed 6 to 12 months after RFA. There was no evidence of right ventricular abnormalities in any patient. *p < 0.05 versus before and one day after RFA in each group; p < 0.05 versus the lower and middle groups in each period. Values are mean ± SD.