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🫀 Modified Shock Index (MSI)

UseEnter heart rate and systolic/diastolic blood pressure; the tool computes MAP and MSI. A higher MSI signals g…

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SourceLiu YC, et al. Modified shock index and mortality rate of emergency patients. World J Emerg Med. 20…

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Scene next step
📋SepsisOpen scene pack →
Related scores
Matching pathway
🧭sepsis_h1Open pathway →
Score + version; reference only — not a substitute for care · no HIS write

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Methodology · worked example, guidelines & full notes
Clinical takeaway

Because MAP weights diastolic pressure, MSI captures both pump rate and perfusion pressure, making it more sensitive than HR/SBP for occult hypoperfusion. (original synthesis · not guideline verbatim)

When to use

Enter heart rate and systolic/diastolic blood pressure; the tool computes MAP and MSI. A higher MSI signals greater hemodynamic compromise and worse outcomes.

How it works

MAP = (SBP + 2×DBP)/3. MSI = HR / MAP. Reference: < 0.7 low normal · 0.7–1.3 normal · > 1.3 suggests hypoperfusion / increased mortality risk.

Key points

  • Because MAP weights diastolic pressure, MSI captures both pump rate and perfusion pressure, making it more sensitive than HR/SBP for occult hypoperfusion. (original synthesis · not guideline verbatim)
  • MSI > 1.3 has been associated with higher mortality and ICU admission across trauma, sepsis, and obstetric-hemorrhage cohorts.
  • It is confounded by beta-blockers, pacing, and pre-existing hypertension; treat it as a trend and trigger, not a standalone diagnosis.

References

Worked calculation

The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.

Heart rate100 bpm
Systolic BP110 mmHg
Diastolic BP70 mmHg

→Modified shock index1.2

  • MAP：83 mmHg
  • Normal range：≈ 0.7–1.3
Verification & sources · governance
FAQ

Frequently asked questions

What are the limits and cautions when using Modified Shock Index (MSI)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
Does Modified Shock Index (MSI) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Modified Shock Index (MSI) calculated in practice? Can you show a worked example?
Inputs: Heart rate 100 bpm, Systolic BP 110 mmHg, Diastolic BP 70 mmHg → Result: Modified shock index 1.2（MAP: 83 mmHg, Normal range: ≈ 0.7–1.3）
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