• (ecg) The record produced by the variations in electrical potential caused by electrical activity of the heart muscle and detected at the body surface, as a method for studying the action of the heart muscle.
  ACC/AHA Clinical Data Terminology
  American College of Cardiology and American Heart Association , 2020
• (electrocardiogram) A line graph that shows changes in the electrical activity of the heart over time. It is made by an instrument called an electrocardiograph. The graph can show that there are abnormal conditions, such as blocked arteries, changes in electrolytes (particles with electrical charges), and changes in the way electrical currents pass through the heart tissue.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• (electrocardiogram) A record of the electrical activity of the heart.
  NCI
  U.S. National Cancer Institute, 2021
• A procedure that displays the electrical activity of the heart.
  NCI
  U.S. National Cancer Institute, 2021
• Measurement and interpretation of electrical manifestations of heart activity.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• The standard electrocardiogram (ECG) provides 12 different vector views of the heart�s electrical activity as reflected by electrical potential differences between positive and negative electrodes placed on the limbs and chest wall. Six of these views are vertical (using frontal leads I, II, and III and limb leads aVR, aVL, and aVF), and...
  Merck Manuals
  Merck & Co., Inc., 2025
• The standard electrocardiography (ECG) provides 12 different vector views of the heart's electrical activity as reflected by electrical potential differences between positive and negative electrodes placed on the limbs and chest wall. Six of these views are vertical (using frontal leads I, II, and III and limb leads aVR, aVL, and aVF),...
  Merck Manuals
  Merck & Co., Inc., 2025
• Introduction The electrocardiogram (ECG) has grown to be one of the most commonly used medical tests in modern medicine. Its utility in the diagnosis of a myriad of cardiac pathologies ranging from myocardial ischemia and infarction to syncope and palpitations has been invaluable to clinicians for decades.
  Medscape
  WebMD, 2025
• Electrocardiography, method of graphic tracing (electrocardiogram; ECG or EKG) of the electric current generated by the heart muscle during a heartbeat. The tracing is recorded with an electrocardiograph (actually a relatively simple string galvanometer), and it provides information on the...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2025