The progression of a J wave during induction of hypothermia.
The J wave (also known as the Osborn wave) is often seen in hypothermia and in hypercalcaemia. It has been described in patients with early repolarisation syndrome, Chagas' disease and Brugada syndrome. The proposed mechanism for J wave development is cold-induced accentuation of the action potential of M and epicardial cells, creating the J wave. Additional conduction delay from endocardium to epicardium then moves the J wave out of the QRS complex. (1) J waves in most cases of hypothermia resolve on return to normothermia, but may persist in some patients. Other ECG changes that may be seen in hypothermia include flattening of the p wave and QT prolongation.
[FIGURE 1 OMITTED]
(1.) Yan GX, Antzelevitch C. Cellular basis for the electrocardiographic J wave. Circulation 1996; 93(2): 372-379.
Corresponding author: R Rodseth (email@example.com)
Dr Rodseth is an anaesthetic specialist in the Department of Anaesthetics at Inkosi Albert Luthuli Central Hospital, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban.
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|Title Annotation:||CLINICAL IMAGES|
|Author:||Rodseth, Reitze Nils|
|Publication:||South African Medical Journal|
|Article Type:||Brief article|
|Date:||Jun 1, 2010|
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