In the normal heart, electrical impulses pace the rhythm at which the heart contracts and relaxes. The sinoatrial (SA) node triggers the electrical impulse, causing the upper chambers (atria) to contract. The signal travels through the atrioventricular (AV) node to the atrioventricular bundle, which divides into the Purkinje fibers. The fibers carry the signal and cause the lower chambers (ventricles) to contract.
The electrocardiogram (EKG, ECG) tracing above reflects this normal electrical activity.
Current as of:
September 7, 2022
Author: Healthwise Staff Medical Review: Rakesh K. Pai MD, FACC - Cardiology, Electrophysiology E. Gregory Thompson MD - Internal Medicine Martin J. Gabica MD - Family Medicine Adam Husney MD - Family Medicine John M. Miller MD, FACC - Cardiology, Electrophysiology
Medical Review:Rakesh K. Pai MD, FACC - Cardiology, Electrophysiology & E. Gregory Thompson MD - Internal Medicine & Martin J. Gabica MD - Family Medicine & Adam Husney MD - Family Medicine & John M. Miller MD, FACC - Cardiology, Electrophysiology
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.