Calculates age multiplied by the modified shock index.
Overview
Calculates age multiplied by the modified shock index.
Clinical Significance
A research-derived haemodynamic risk marker. It should not delay resuscitation or replace assessment of perfusion and cause of shock.
How It Is Calculated
- Age-MSI = age × heart rate / mean arterial pressure.
Interpretation
- A research-derived haemodynamic risk marker. It should not delay resuscitation or replace assessment of perfusion and cause of shock.
Worked Example
Enter a clinically consistent set of values in the displayed units. MedicalC applies: Age-MSI = age × heart rate / mean arterial pressure.
Limitations
- This tool does not establish a diagnosis or mandate treatment.
- Published cut-offs may vary between cohorts and measurement methods.
- Calculation precision cannot compensate for poor source data.
Clinical Pearls
- Trend the result over time where clinically appropriate.
- Record the source values and units alongside the calculated result.
Common Mistakes
- Using the wrong unit.
- Combining measurements obtained at different times.
- Applying a research-derived threshold as a universal treatment trigger.
Frequently Asked Questions
What does this calculator provide?
Calculates age multiplied by the modified shock index.
Can this result be used alone?
No. It must be interpreted with clinical context and appropriate investigations.
What equation is used?
Age-MSI = age × heart rate / mean arterial pressure.
What is the main limitation?
The result depends on valid inputs and may not be calibrated for every population or setting.
References
- Observational emergency and trauma literature on age-modified shock index. — Formula, physiological or validation reference.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026