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Electrocardiogram (EKG)

Physician developed and monitored.

Original Date of Publication: 25 Nov 2004
Reviewed by: Stanley J. Swierzewski, III, M.D.
Last Reviewed: 04 Dec 2007

Original Source: http://www.cardiologychannel.com/diagnostics/EKG.shtml

Important Facts

  • Electrocardiogram also is called an EKG or ECG
  • EKG is a noninvasive test to measure electrical activity of the heart
  • Heart function can be assessed using an electrocardiogram
  • EKG can help diagnose heart attack, atrial fibrillation, and heart failure

Home » Diagnostic Tests » Electrocardiogram (EKG)




An electrocardiogram (ECG or EKG) is a noninvasive test used to measure electrical activity in the heart. Electrical sensors called leads are attached to predetermined positions on the arms, legs, and chest to record electrical activity and help assess heart function.

The ECG creates a graph that represents the normal phases of activation of the heart. When patients' hearts beat normally in sinus rhythm, separate little bumps and lines indicate when the atria contract and when the ventricles contract. In patients with atrial fibrillation, the bumps showing organized contraction of the atria are no longer present. Instead, there are irregular, squiggly lines.

The ECG can also suggest recent or past heart attack, inflammation of the pericardium, or a blood clot that has traveled to the lungs. Electrocardiogram may be used in the diagnosis of atrial fibrillation, congestive heart failure, and heart attack.

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