About a month ago I began having PVCs, sometimes trigeminy, sometimes even bigeminy, then sometimes just randomly. They do appear to be increasing in frequency and occasionally I have had some lightheadedness. (The PVCs were confirmed on a 24 hour holter monitor) I am 60 years old and have a strong family history of heart disease. Is this rhythm disturbance a warning sign of impending heart attack or could this be benign?