atrial fusion beat

a·tri·al fu·sion beat

a beat that occurs when the atria are activated in part by the sinus impulse and in part by an ectopic or retrograde impulse from A-V junction or ventricle.

atrial fusion beat

n.
A pulsation occurring when the atria of the heart are activated partly by a sinus impulse and partly by a retrograde impulse from the atrioventricular node or ventricle.

a·tri·al fu·sion beat

(ā'trē-ăl fyū'zhŭn bēt)
A beat that occurs when the atria are activated in part by the sinus impulse and in part by an ectopic or retrograde impulse from A-V junction or ventricle.
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