Shock Index Calculator

Assess circulatory shock risk using heart rate and blood pressure

Calculate Shock Index

bpm

Normal: 60-100 bpm

mmHg

Normal: 90-140 mmHg

Standard Shock Index Results

--
SI = HR / SBP
Enter Values
Please enter heart rate and systolic blood pressure
Risk Level: Unknown

Medical Disclaimer

This calculator is for educational purposes only and should not replace clinical judgment. Shock is a medical emergency requiring immediate professional medical evaluation and treatment. Always consult with healthcare professionals for proper diagnosis and management.

Normal Ranges

Standard Shock Index

Normal:0.5 - 0.7
Elevated:0.7 - 0.9
High Risk:> 0.9

Modified Shock Index

Normal:< 1.0
Elevated:1.0 - 1.3
High Risk:> 1.3

Age Shock Index

Normal:< 50
Elevated Risk:> 50

Clinical Applications

🩺

Emergency department triage and risk assessment

🚑

Prehospital evaluation of trauma patients

Early detection of occult shock states

📊

Predictor of transfusion requirements

🏥

ICU admission risk stratification

Example Clinical Cases

Case 1: Normal Patient

Patient: 35-year-old healthy adult

Heart Rate: 75 bpm

Systolic BP: 120 mmHg

Shock Index: 75 / 120 = 0.625

Interpretation: Normal range (0.5-0.7)

Case 2: Hypovolemic Shock

Patient: 45-year-old trauma patient

Heart Rate: 120 bpm

Systolic BP: 90 mmHg

Shock Index: 120 / 90 = 1.33

Interpretation: Critical elevation indicating shock

Understanding the Formula

Standard Shock Index

Formula: SI = HR / SBP

Purpose: Quick bedside assessment of circulatory status

Advantage: Simple, requires only two vital signs

Modified Shock Index

Formula: MSI = HR / MAP

Purpose: Enhanced assessment using mean arterial pressure

Advantage: Better predictor of ICU admission and sepsis

Age Shock Index

Formula: ASI = (Age × HR) / SBP

Purpose: Cardiac risk assessment in myocardial infarction

Advantage: Incorporates age-related cardiovascular risk