Medical calculators

Shock Index

HR / Systolic BP

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How it is calculated

Shock index = heart rate / systolic blood pressure. Its value is that it rises before the blood pressure falls, particularly in young patients and in pregnancy, where compensation keeps the systolic normal until late. Beta blockers blunt the tachycardia and can mask it.

About

Heart rate divided by systolic pressure. Rises before blood pressure falls, so it flags shock earlier than pressure alone.

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