Healthcare Library

 
Bookmarks
bookmarks-menu
 
E-mail Form
Email Results

 
 

Electrocardiogram - ECG - recording

An ECG represents a composite recording of all the action potentials generated by all cardiac muscle cells during each heartbeat. To record an ECG, 12 metal electrodes are positioned on the arms, legs, and chest. These electrodes detect the heart electric activity and transmit it to the electrocardiograph, which amplifies and records the signals. The twelve electrodes, or leads, are placed on the body to obtain 6 limb leads and 6 chest leads. Together, these leads provide a 3-dimensional representation of the heart electric activity. Each lead is analogous to a video camera recording the same event, atrial and ventricular depolarization, and repolarization from a different angle. Therefore, each limb or chest lead record slightly different electric activity of the heart. This results in the electrocardiograph producing 12 different tracings. By comparing these recordings with one another, and with normal tracings, physicians can detect heart abnormalities, including the presence of arrhythmia, enlargement of left ventricle, abnormalities in the cardiac conduction system, and damage to certain regions of the heart.

Electrocardiogram - ECG - recording

Disclaimer

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

Animations

Browse All

Videos

Browse All

In-Depth Animations

Browse All

A.D.A.M. content is best viewed in IE9 or above, Firefox and Google Chrome browser.
Content is best viewed in IE9 or above, Firefox and Google Chrome browser.

ways to give

view all

news room

view all

healthcare library

view all
Event Calendar

Hunterdon Healthcare offers an array of educational events, including childbirth, healthy living and fitness classes.

LEARN MORE
Health and Wellness Centers

Where health and fitness meet to help you stay healthy at every age.

LEARN MORE
Heart & Vascular

Heart and Vascular Services Department brings world-class cardiovascular care to our community.

LEARN MORE