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Ventricular fibrillation threshold for AC shocks of long duration, in dogs with normal acid-base state
  1. Janet R. Scott,
  2. W. R. Lee,
  3. S. Zoledziowski
  1. Department of Occupational Health, University of Manchester
  2. Department of Electrical Engineering, University of Salford

    Abstract

    Scott, Janet R., Lee, W. R., and Zoledziowski, S. (1973).British Journal of Industrial Medicine,30, 155-161. Ventricular fibrillation threshold for AC shocks of long duration, in dogs with normal acid-base state. Earlier experimental studies of threshold ventricular fibrillating currents passing along the common accident pathway of forelimb to leg have shown a wide range of results for any one shock duration. In the present investigation the acid-base state of the experimental animals (dogs) was held within normal limits. It was found that whereas the mean minimum fibrillating current, 82·2μA for 3-second shocks, was within the values found by other workers, the range of results was reduced considerably to 67-101μA. Further, when the shock duration was increased, in stages, up to 60 seconds, again keeping the acid-base state within normal limits, the mean minimum fibrillating current did not alter markedly (being 80μA at 60 seconds) but the range of results progressively fell and was 73-88μA at 60 seconds. In the light of these findings the mechanism of ventricular fibrillation is discussed.

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