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Related to ectopic rhythm: sinus rhythm
any cardiac rhythm arising from a center other than the normal pacemaker, the sinus node.
Etymology: Gk, ek + topos, place, rhythmos, beat
an abnormal heart rhythm caused by the formation of impulses in a focus outside the sinus node. Such a rhythm may be protective in cases of failure of the sinus node or excessive slowing of its rhythm, or it may indicate an active abnormal focus.
A heart rhythm originating outside the sinoatrial node.
See also: rhythm