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Sinus arrest

See brief interpretation of EKG strip above

Sinus arrest is a transient pause in sinus node activity. Sinus arrest is recognized on the EKG as an isoelectric line of variable duration with no P waves or QRS complexes. The pause is usually followed by an AV-nodal escape beat or a new sinus node beat (as in the EKG above).

Sinus arrest may look like a sino-atrial (SA) block. In SA block the sinus activity is preserved, but the impulses are blocked resulting in missed P waves and QRS complexes. However, in SA block the pause seen on the EKG will represent a multiple (whole number) of the preceding P-P interval. This relationship is absent in sinus arrest.

Sinus arrest may be seen due to increased vagal tone, drug intoxication or sick sinus node syndrome.

– Mathias

{ 2 comments… read them below or add one }

jane hayes November 10, 2011 at 10:43 am

who do I contact to request permission to reproduce this ECG rhythm strip in a journal article in UK?

roger August 7, 2012 at 2:59 pm

Sinus arrest can also be observed during sleep while in stage REM. It is known as REM-sleep related sinus arrest. rare condition, is diagnosed during a polysomnogram (sleep study). FYI

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