Heart & Cardiology/PVC's


hello Doctor,

I've noticed before in concerning PVC's you often say "Pvc's are normal heart activity, easy to understand as normal from knowledge of the heart's electrical system... etc" would you care to elaborate on this? What separates a dangerous PVC from a benign one? sometimes I get 10-15 a day and other times I get 40-50 in a 2 hour period. Is this normal?

Hello Caleb,

Bo PVCs, no matter how frequent, are dangerous for a person with normal EKG and echo

Any cell in the heart can generate an electrical impulse that will stimulate the whole heart.  If a cell in a ventricle discharges itself, it makes a PVC.  Low blood potassium or magnesium tend to discharges cells, but some times a ventricular cell will discharge without apparent cause, which happens with most PVCs.

Please write back if this doesn’t answer all your questions.

David Richardson

Heart & Cardiology

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David Richardson


Adult heart function and disease. Not very good about children lesss than 12. Hypertension is o.k. Heart rhythm a special interest.


Certified in cardiology by the American Board of Internal Medicine. Was chairman of division of cardiology at the Medical College of Virginia. Am now mostly retired.

Fellow of American Heart Association and American College of Cardiology and member of American Physiological Society..

Circulation, American Heart Journal, Hypertension.

M.D. from Harvard Medical School. Residency training at Yale Uhniversity School of Medicine and Medical College of Virginia.

Awards and Honors
Gold Heartt Award from American Heart Association in 1995.

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