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Definition: a beat triggered by more than a single electrical impulse, when the wave fronts coincide to act together on a single final pathway of activity; in the electrocardiogram, the atrial or ventricular complex when either atria or ventricles are activated jointly by two simultaneous or nearly simultaneous invading impulses.
Synonym(s): combination beat, mixed beat, summation beat
Examples: glitazone, GI cocktail, etc.
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