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 that carry the signal and cause the lower
chambers (ventricles) to contract. The electrocardiogram (EKG, ECG) tracing
above reflects this normal electrical activity.
Primary Medical Reviewer
E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer
John M. Miller, MD - Electrophysiology
November 2, 2010
WebMD Medical Reference from Healthwise
November 02, 2010
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