Osborn wave

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Osborn wave. 81-year-old black male with BP 80/62 and temperature 31.9 C (89.5 F).
Atrial fibrillation and Osborn J wave in a person with hypothermia

An Osborn wave — also known as camel-hump sign, late delta wave, hathook junction, hypothermic wave, prominent J wave ,[1] K wave, H wave or current of injury — is an abnormal electrocardiogram finding.[2]

Osborn waves are positive deflections occurring at the junction between the QRS complex and the ST segment,[3][4] where the S point, also known as the J point, has a myocardial infarction-like elevation.


They are usually observed in people suffering from hypothermia with a temperature of less than 32 C (90 F),[5] though they may also occur in people with high blood levels of calcium (hypercalcemia), brain injury, vasospastic angina, or ventricular fibrillation.


The prominent J deflection attributed to hypothermia was first reported in 1938 by Tomaszewski. These waves were then definitively described in 1953 by John J. Osborn (born 1917) and were named in his honor.[6] Over time, the wave has increasingly been referred to as an Osborn wave, in most part due to Osborn's article in the American Journal of Physiology on experimental hypothermia.[7]


  1. ^ Aydin M, Gursurer M, Bayraktaroglu T, Kulah E, Onuk T (2005). "Prominent J wave (Osborn wave) with coincidental hypothermia in a 64-year-old woman". Tex Heart Inst J. 32 (1): 105. PMC 555838Freely accessible. PMID 15902836. 
  2. ^ Maruyama M, Kobayashi Y, Kodani E, et al. (2004). "Osborn waves: history and significance". Indian Pacing Electrophysiol J. 4 (1): 33–9. PMC 1501063Freely accessible. PMID 16943886. 
  3. ^ "ecg_6lead018.html". Retrieved 2008-12-20. 
  4. ^ "THE MERCK MANUAL OF GERIATRICS, Ch. 67, Hyperthermia and Hypothermia, Fig. 67-1". Retrieved 2008-12-20. 
  5. ^ Marx, John (2010). Rosen's emergency medicine: concepts and clinical practice 7th edition. Philadelphia, PA: Mosby/Elsevier. p. 1869. ISBN 978-0-323-05472-0. 
  6. ^ Osborn JJ. Experimental hypothermia: Respiratory and blood pH changes in relation to cardiac function. Am J Physiol 1953; 175: 389-398.
  7. ^ Serafi S, Vliek C, Taremi M (2011) "Osborn waves in a hypothermic patient" The Journal of Community Hospital Internal Medicine Perspectives http://www.jchimp.net/index.php/jchimp/article/view/10742/html