[Osborn J wave. A new "channel pathology"? A case report].

We report, at the time of a hypothermia major, the observation of an anomaly of the repolarisation on the electrocardiogram of surface, called "J wave", and described in an exhaustive way by Osborn, which attached its name there. It corresponds to the picking of the terminal section of the QRS, with heightening in dome, the J point is then elevated compared to the base line. It can be also seen among patients normothermic in physiological or pathological circumstances. Its physiopathology from now on is understood better, the J wave is the result of the difference of potential action between the epicarde and endocarde during phases 1 and 2 of the ventricular repolarisation. This gradient is related to the Ito current, also accused in the "channel pathologies", of which Brugada syndrome.