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Here’s advice on taming heart palpitations
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Here’s advice on taming heart palpitations

From the Worried amid world events? Heed doctor's advice and other health tips series
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Premature ventricular contractions, or PVCs, are not dangerous and usually don’t require treatment.

Q: I have days when I feel my heart jump or skip. I don’t have a heart problem and it only happens when I’m sitting or lying down in bed. Is this something to worry about?

A: Feeling your heart beat and having it skip or jump once in a while is very common. Doctors call them palpitations. The sensation can be disconcerting; but occasional, brief hiccups in the heart's normal rhythm rarely indicate a serious problem.

Here’s how I help my patients think about palpitations. I first ask about how often the sensation occurs and whether there are additional associated symptoms.

Occasional palpitations that last only a few seconds typically are not anything to worry about. But if symptoms last longer and you are lightheaded, feel like you might pass out, or have chest pain or shortness of breath, you should seek immediate medical attention.

If I were seeing you in the office, I would ask you to tap the back of my hand with your fingers to simulate what the palpitations feel like. If you tap out a string of steady beats with a quick stutter for one or two seconds, and then back to steady, that almost always represents what doctors call premature beats.

Premature beats can arise either from the upper heart chambers (atria) or the lower chambers (ventricles). Usually the ones you can feel come from the ventricles. Doctors call them premature ventricular contractions, or PVCs. By themselves, they are not dangerous and usually don’t require treatment. Based on your description, that is likely what you have.

PVCs occur when an extra electrical signal starts in the ventricles soon after the previous normal contraction, triggering a second contraction. You may not feel the second contraction; instead, it may seem as though your heart has missed a beat. The next regular contraction can pump with more force than normal and you may feel a thump or the sensation that your heart has flip-flopped.

If on the other hand you were to tap out a very slow or very fast rhythm or one that is very irregular, then I would be more concerned about a different cause. Again, most often these are not dangerous problems either, but they would require more investigation. That starts with listening to your heart and doing an electrocardiogram (ECG).

Even though premature beats aren’t dangerous, they can still be bothersome if they occur frequently. The first step is to avoid possible triggers, such as anxiety, stress, caffeine, alcohol, and stimulants like pseudoephedrine (Sudafed). When that doesn’t help, doctors sometimes prescribe a beta blocker medication.

(Howard LeWine, M.D., is an internist at Brigham and Women’s Hospital in Boston and assistant professor at Harvard Medical School. For additional consumer health information, please visit www.health.harvard.edu.)

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