Cardiac Monitoring



Ambulatory cardiac monitoring watches and records heart activity during the day. Most devices are about the size of a mobile phone.

Heartbeat on EKG Monitor
Nucleus image
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Possible Complications

This test does not cause problems.



This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Edits to original content made by Denver Health.

a (Holter Monitoring; Ambulatory Electrocardiography [EKG])


American Heart Association 

Heart Rhythm Society 


Canadian Cardiovascular Society 

Heart and Stroke Foundation of Canada 


Ambulatory cardiac telemetry monitoring. EBSCO DynaMed website. Available at: . Updated June 7, 2017. Accessed November 19, 2019.

Ambulatory monitors. Cleveland Clinic Heart Center website. Available at: Updated April 22, 2019. Accessed November 19, 2019.

Priori SG, Blomström-Lundqvist C, et al. 2015 European Society of Cardiology (ESC) Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death. Endorsed by: Association for European Paediatric and Congenital Cardiology (AEPC). Eur Heart J. 2015 Nov 1;36(41):2793-2867.