sinus pause

During a sinus pause, the heart may miss one or more beats because its natural pacemaker fails to activate the electrical system throughout the rest of the heart.

Periods of time when the sinus node does not fire at all (sinus pauses) and other areas of the heart take over and cause the heart to beat.

Additional features that are sometimes present include a prominent U wave, abnormal contour of T or TU waves, T wave alternans, a subnormal spontaneous sinus rate (especially in children), and sinus pauses.

Sinoatrial arrest (also known as sinus arrest or sinus pause) is a medical condition wherein the sinoatrial node of the heart transiently ceases to generate the electrical impulses that normally stimulate the myocardial tissues to contract and thus the heart to beat.