Shock Index Calculator
Assess circulatory shock risk using heart rate and blood pressure
Calculate Shock Index
Normal: 60-100 bpm
Normal: 90-140 mmHg
Standard Shock Index Results
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
Modified Shock Index
Age Shock Index
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