Cardiac ectopy
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Cardiac ectopy or "ventricular extra beats" is a disturbance of the electrical conduction system of the heart in which beats arise from the wrong part of the heart muscle. It is a form of cardiac arrhythmia in which ectopic foci in the ventricular myocardium, or from finer branches of the electric transduction system, cause additional beats of the heart. Some medication may worsen the condition. It does not usually need to be treated medically.

For further detail, see the discussion on origin of cardiac impulse in the Arrhythmia article.

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