Figure 1. 24-Hour Premature Ventricular Contraction (PVC) Burden Assessed Using Holter Monitoring During Follow-up.

After an initial decrease, the PVC burden remained stable over time. All 169 patients underwent baseline Holter monitoring at disease diagnosis; 146, within the first 12 months after diagnosis; 149, 13 to 24 months after diagnosis; 122, 25 to 36 months after diagnosis; 86, 37 to 48 months after diagnosis; and 50, 49 to 60 months after diagnosis.

^aP < .001.

^bP = .88.