Rules of malignancy for pvcs? do these apply to people with normal hearts?

Yes and No: The ticklish part is determining "normal" as that depends on the sophistication of the tests. Pvcs resulting in loss of consciousness are not benign. Pvcs causing just palpitations with a normal echo, ekg, and no evidence of coronary disease or other significant structural abnormality are benign. General rule: the health of the heart, not the # of pvcs determines benignity. Family hx counts too.

It depends: It depends on a variety of factors such as your heart (structure, function, ejection fraction, presence/ absence of coronary disease) and pvcs (singlets, couplets, runs of ventricular tachycardia, coupling interval - how fast they occur after a normal beat, frequency in 24 hours). An electrophysiologist (ep doctor) is best suited to deal with these.