Table 1.

Characteristics of benign and malignant premature ventricular contractions (PVCs).

Benign PVCS	Malignant PVCS
Negative familial history	Positive familial history
Mild/No symptoms	No/Mild/Severe symptoms
Monomorphic	Monomorphic or polymorphic
Common ECG pattern	Uncommon ECG pattern
Suppressed by exercise	Induced, suppressed or not by exercise