Osborn wave
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Overview
Osborn waves (also known as camel-hump sign, late delta wave, hathook junction, hypothermic wave, J point wave, K wave, H wave or current of injury) are usually observed on the electrocardiogram of people suffering from hypothermia, though they may also occur in people with high blood levels of calcium (hypercalcemia), brain injury, subarachnoid hemorrhage, damage to sympathetic nerves in the neck, and cardiopulmonary arrest from over sedation, vasospastic angina, or ventricular fibrillation. [1] [1] [1] [1]
Osborn waves are positive deflections occurring at the junction between the QRS complex and the ST segment, where the S point, also known as the J joint, has a myocardial infarction-like elevation.
All J wave deflections do not look alike. Some are merely elevations of ST segments in leads V1 and V2, whereas others are of the spike-and-dome variety. This leads to the conclusion that different mechanisms may be responsible for the size and shape of J wave deflections.
Historical background
The prominent J deflection attributed to hypothermia was first reported in 1938 by Tomaszewski. The wave was observed by others, including Kossmann, Grosse-Brockhoff and Schoedel, Bigelow et al, Juvenelle et al, and Osborn. [1] [1] [1] [1]
Over the years, the unusual wave increasingly has been called an Osborn wave, probably because of Osborn's excellent descriptive article written in 1953. Clinicians labeled the deflection an Osborn wave in honor of Osborn, one of the first American Heart Association research fellows. [1] [1]
Examples
 The time course of twelve-lead ECG in a 52-year-old man with vasospastic angina. ECGs were obtained prior to the ischemic attack (A), at the onset of chest pressure (B), immediately before ventricular fibrillation (C), after defibrillation and administration of intravenous lidocaine and magnesium (D), and 2 days after the episode (E). Osborn waves (arrowheads) were best seen in the inferior and lateral leads around the occurrence of ventricular fibrillation. In contrast to hypothermic patients, the tracing shows sinus tachycardia and short QT intervals.[1] |
EKG's from a case report
 Admission EKG: Sinus bradycardia and giant Osborn wawes [1] |
 Same patient's post treatment EKG. Faster sinus rhythm with smaller Osborn waves. [1] |
References
External links
- Naming of the Waves in the ECG, With a Brief Account of Their Genesis
- Osborn waves: history and significance.
- A case report. Article in Turkish
Additional resources
- ECGpedia: Course for interpretation of ECG
- The whole ECG - A basic ECG primer
- 12-lead ECG library
- Simulation tool to demonstrate and study the relation between the electric activity of the heart and the ECG
- ECG information from Children's Hospital Heart Center, Seattle
- ECG Challenge from the ACC D2B Initiative
- National Heart, Lung, and Blood Institute, Diseases and Conditions Index
- A history of electrocardiography
- EKG Interpretations in infants and children
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
