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Cardiology Emergency Medicine Anaesthesia / Critical Care Moderate — validated across multiple emergency populations

Shock Index

Ratio of heart rate to systolic blood pressure. Identifies haemodynamically unstable patients and predicts mortality in various emergency conditions including trauma, sepsis, and obstetric emergencies.

Score interpretation

Normal 0–0.59

Shock Index < 0.6: Normal haemodynamic status.

→ No immediate haemodynamic intervention required.

Normal–Mildly Elevated 0.6–1

Shock Index 0.6–1.0: Normal range. Mild elevation possible in compensated shock.

→ Monitor. Reassess if clinical deterioration.

Moderate Shock Risk 1–1.4

Shock Index > 1.0: Increased mortality risk. Significant haemodynamic compromise.

→ IV access, fluid challenge, crossmatch. Identify source: haemorrhage, sepsis, PE, cardiogenic.

Severe Shock Risk ≥ 1.4

Shock Index > 1.4: High mortality risk. Consider massive transfusion protocol in trauma.

→ Immediate resuscitation. Activate MTP in trauma. Senior review. ICU referral.

Interpretation bands for the Shock Index. Apply clinical judgement and local guidance.

References

Related

Curated clinical cross-links plus same-class fallbacks.

📚 MRCEM Revision

Featured in these MRCEM clinical pathways

The Shock Index is covered in detail — with RCEM/NICE evidence base, indications and pitfalls — in the following exam-focused pathways on our sister siteReviseMRCEM.

MRCEM Primary / Intermediate / OSCE candidates: each pathway includes exam-style questions, RCEM/NICE citations, and FAQ summaries.

Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.