The J loop of the spatial vectorcardiogram in accidental hypothermia in man.
نویسندگان
چکیده
TheJ' loop of the spatial vectorcardiogram has been studied, using the Frank system of lead placement, in 25 patients with accidental hypothermia. There was a highly significant correlation (P<0o0025) between the duration of the loop (range 40-i60 msec) and the severity of the hypothermia, but its rate of inscription may (a) be uniform throughout, (b) slow progressively throughout, or (c) slow only towards its end. The variation in the form of the deflections in scalar electrocardiographic leads during hypothermia is determined by the spatial interrelation of the axes of these leads and theJ loop of the spatial vectorcardiogram. An appreciation of this relation emphasizes the true nature and significance of the less well-known forms of the scalarj deflections in hypothermia. Thesefindings may be determined by changes induced by hypothermia in the permeability of the myocardial cell membranes and ionicfluxes across them. Despite severe hypothermia, one patient had no scalarJ deflection and noJ loop was present in the corresponding spatial vectorcardiogram.
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عنوان ژورنال:
- British heart journal
دوره 36 7 شماره
صفحات -
تاریخ انتشار 1974