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Shock index calculator

Heart rate divided by systolic blood pressure, for an adult. A ratio of two vital signs you already have.

Training aid

Training aid only. Verify every value against your local protocol and medical direction before acting on it.

Practice this on a patient. The 60-second call is free, with no account.Start a free call

Adults only, and not a rule-out

A normal index does not rule out shock. The index is not age-adjusted: in children the normal heart rate and blood pressure change with age, so the adult range below does not apply to them. The adult range does not apply in pregnancy, where the index runs higher.

Result

Enter a heart rate and a systolic pressure.

Source

Allgower M, Burri C. Schockindex. Dtsch Med Wochenschr. 1967;92(43):1947-1950, the origin of the index. The normal range of 0.5 to 0.7 follows Rady MY, Nightingale P, Little RA, Edwards JD. Shock index: a re-evaluation in acute circulatory failure. Resuscitation. 1992;23(3):227-234. The threshold above 0.9 follows Rady MY, Smithline HA, Blake H, Nowak R, Rivers E. A comparison of the shock index and conventional vital signs to identify acute, critical illness in the emergency department. Ann Emerg Med. 1994;24(4):685-690.

The shock index is a ratio of two vital signs, not a diagnosis. A normal index does not rule out shock. Beta blockers, pacemakers and anything else that holds the heart rate down will hold the index down with it. It is not age-adjusted: in children the normal heart rate and blood pressure change with age, so an adult range does not apply. The adult range does not apply in pregnancy, where the index runs higher. What an elevated index means for your patient is for your assessment and your protocol.

Knowing the number is not the same as running the call.

60-second call

One patient. Four vitals. Your priority actions. Every case is written at Paramedic (ALS) scope.

A short prehospital call with four vitals, from a real-life scenario a paramedic wrote. Type your priority actions and why, and get a debrief graded against a paramedic's rubric. Cases are written and graded at US Paramedic (ALS) scope.

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Run the whole call, dispatch to handoff.

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