Shock index (and modified shock index)
A simple heart-rate/blood-pressure ratio detecting occult hypoperfusion and estimating shock severity, especially in trauma and haemorrhage.
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Method · Limits of application
Shock Index/Allgöwer 1967 HR/SBP and Modified Shock Index/Liu 2012 HR/MAP
Shock index uses heart rate divided by systolic pressure; modified shock index uses mean arterial pressure. These are different ratios and do not by themselves diagnose shock or a need for transfusion. Mutschler 2013 assessed the index on emergency-department arrival in 21,853 adults with trauma; Liu 2012 retrospectively studied 22,161 patients aged 10–100 who received intravenous fluids and excluded resuscitated cardiorespiratory arrests without triage. These cohorts do not establish universal cutoffs for children of all ages, pregnant people or other situations. Record the timing and measurement conditions; cohort associations with in-hospital mortality are not automatic individual predictions.
Conditions of use
Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.
Documented parameters
- Heart rate · bpm
- Systolic blood pressure · mmHg
- Diastolic pressure (for the modified index) · mmHg
4/4 reference cases checked. Numerical tests are not clinical validation.
Relationship with cancer research
General context — relationship to be defined
A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.