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Etymology: L, extra, outside; AS, beatan
an extra heart contraction. It is indicated by a premature atrial, junctional, or ventricular complex on an electrocardiogram.
A pulsation or throb (e.g., as in contraction of the heart).
The impulse of the heart felt by the hand when held over the fifth or sixth intercostal space in the left midclavicular line.
artificially paced beat
A heartbeat stimulated by an artificial pacemaker.
A ventricular contraction directly stimulated by an electrical impulse either from the sinus node or from the pulse generator of a pacemaker.
complex ectopic beat
Any electrical activation of the heart that originates outside the sinoatrial node.
A single interruption in the regular pacing of the electrical and mechanical activity of the heart.
An electrical impulse that begins at any place in the heart other than the sinoatrial node.
A depolarization of the heart that occurs after a prolonged pause or after failure of the sinus node to generate an electric impulse. Most escape beats are generated in the ventricles.
Extrasystole brought on by artificial heart stimulation.
An electrical impulse that arises from a site other than the sinus node in the heart, occurring before the expected sinus beat.