World Library  
Flag as Inappropriate
Email this Article

U wave

Article Id: WHEBN0008851949
Reproduction Date:

Title: U wave  
Author: World Heritage Encyclopedia
Language: English
Subject: Cardiovascular physiology, Aortic valve area calculation, Hexaxial reference system, Atrial action potential, Paraganglion
Publisher: World Heritage Encyclopedia

U wave

A U wave as seen on ECG
An electrocardiogram of an 18-year-old man showing U waves, most evident in lead V3.

The U wave is a wave on an electrocardiogram that is not always seen. It is typically small, and, by definition, follows the T wave. U waves are thought to represent repolarization of the papillary muscles or Purkinje fibers.[1]


Prominent U waves are most often seen in hypokalemia, but may be present in hypercalcemia, thyrotoxicosis, or exposure to digitalis, epinephrine, and Class 1A and 3 antiarrhythmics, as well as in congenital long QT syndrome, and in the setting of intracranial hemorrhage.

An inverted U wave may represent myocardial ischemia (and especially appears to have a high positive predictive accuracy for left anterior descending coronoray artery disease[2] ) or left ventricular volume overload.[3]

A U-wave can sometimes be seen in normal younger, athletic individuals.[4]


  1. ^ Pérez Riera AR, Ferreira C, Filho CF, et al. (2008). "The enigmatic sixth wave of the electrocardiogram: the U wave". Cardiol J 15 (5): 408–21.  
  2. ^ Gerson MC, Phillips JF, Morris SN, McHenry PL (1979). "Exercise-induced U-wave inversion as a marker of stenosis of the left anterior descending coronary artery". Circulation 60: 1014–1020.  
  3. ^ Conrath C, Opthof T (2005). "The patient U wave". Cardiovasc Res 67 (2): 184–6.  
  4. ^ EKG-boken Ylva Lind, Lars Lind, Liber, 2011
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.