ALERT

Access info on COVID tests, vaccines, visitor policy, hospitalization data, and FAQs.

toggle mobile menu Menu
toggle search menu

Site Navigation

Supplemental

Menu

Normal sinus rhythm

Normal sinus rhythm

The normal sinus rhythm is the rhythm and rate of impulses generated by certain muscle cells as a signal to the upper heart chambers (atria) to contract.

The heart contains a cluster of specialized muscle cells that act as the heart's natural pacemaker. This cluster is called the sinoatrial node, or SA node. The SA node generates the electrical signals that cause the upper heart chambers (atria) to contract. At rest, an adult's SA node normally sends about 60 to 100 impulses per minute.

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Healthwise is a URAC accredited health web site content provider. Privacy Policy. How this information was developed to help you make better health decisions.

© 1995- Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.