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The shock index is equal to heart rate divided by systolic arterial blood pressure. It has received a fair amount of attention in the human medicine literature being evaluated for example in haemorrhagic hypovolaemic shock, especially post-traumatic, sepsis and obstetric patients, and for correlation for example to length of hospital stay and mortality. There is very little clinical veterinary information on the shock index. In this episode I discuss what the shock index is, the parameters that are included in the shock index, the potential value of the shock index, some of the human medicine studies, and the following two canine studies: Porter A, Rozanski E, Sharp C, et al. Evaluation of the shock index in dogs presenting as emergencies. J Vet Emerg Crit Care 2013. 23(5):538–544. Peterson KL, Hardy BT, Hall K. Assessment of shock index in healthy dogs and dogs in hemorrhagic shock. J Vet Emerg Crit Care 2013. 23(5):545-550.   For show notes for this episode and a full list of all papers that informed or were mentioned in this episode, see HERE. Click Here For Your FREE Copy of a Transcript of This Episode