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===[[Shock index]] (SI)<ref>Levitan, Richard M. Fundamentals of Airway Management. 3rd ed. Irving, TX: Emergency Medicine Residents' Association, 2015.</ref>===
SI = HR / SBP
*Used when HR and SBP do not predict severity of hypovolemia in early stages
*May be used as secondary triage tool in [[mass casualty incidents]]<ref>Vassallo J et al. Usefulness of the Shock Index as a secondary triage tool. J R Army Med Corps. 2015 Mar;161(1):53-7.</ref>
*0.5-0.7 is normal
*>0.70-0.75 for occult shock or requirement of life-saving intervention

Simple Shock Index (sSI) was recently proposed. 
Subtracting SBP from HR is a good SI substitute. Working with integers is easier than dividing them, improving value availability.<ref>Kamikawa Y, Hayashi H. Equivalency between the shock index and subtracting the systolic blood pressure from the heart rate: an observational cohort study. BMC Emergency Medicine. 2020 Dec;20:1-8.</ref>