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Electrocardiographic Terms 


Harriet S. Meyer

International standardization of electrocardiographic nomenclature dates back to the mid-20th century. The preferred abbreviation for electrocardiogram and electrocardiographic in JAMA and the Archives Journals is ECG, not EKG. In the following examples of ECG terms note the use of capitals, lowercase letters, subscripts, and hyphens. Leads (recording electrodes) are designated as follows: Example: The abnormality appeared in leads V3 through V6 [not V3-V6 or V3-6]. The main deflections of the ECG (see Figure ) are named in alphabetical sequence (P, Q, R, S, T, U), a usage that dates back to the inventor, Willem Einthoven. Other deflections use initial letters

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