SciELO - Scientific Electronic Library Online

vol.100 número6The burden of infertility among HIV-positive couples in South Africa: the available evidenceSomerset Hospital: South Africa's oldest hospital índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google


SAMJ: South African Medical Journal

versão On-line ISSN 2078-5135
versão impressa ISSN 0256-9574

SAMJ, S. Afr. med. j. vol.100 no.6 Pretoria Jun. 2010




The progression of a J wave during induction of hypothermia



Reitze Nils Rodseth



J waves can commonly be seen in patients with severe hypothermia. Fig. 1 shows an ECG recording of a patient undergoing coronary artery revascularisation with the use of cardiopulmonary bypass. The purple recording shows the ECG with a small, existing J wave early during the initiation of cooling. The green overlay demonstrates the accentuation of the J wave as the patient was further cooled to 29ºC.



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.


1. Yan GX, Antzelevitch C. Cellular basis for the electrocardiographic J wave. Circulation 1996; 93(2): 372-379.         [ Links ]



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.



Corresponding author: R Rodseth (

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons