Shock Index Calculator

How to calculate Shock Index?

The Shock Index (SI) is a simple clinical indicator derived from vital signs to evaluate hemodynamic status.

Formula: SI = Heart Rate / Systolic Blood Pressure

Using the Shock Index calculator: an example

For a patient with a Heart Rate of 105 BPM and a Systolic BP of 90 mmHg:

Step-by-step calculation:

• Identify Heart Rate (105) and Systolic BP (90)
• Divide 105 by 90
• Resulting Shock Index is 1.17 (High Risk)

Frequently Asked Questions

What is a normal Shock Index?

In healthy adults, the normal range is typically between 0.5 and 0.7.

Why is the Shock Index useful?

It can identify 'occult' shock where blood pressure appears normal but the heart rate is compensating for low volume.

When is the index less reliable?

Accuracy may be affected by medications like beta-blockers, which prevent the heart rate from rising normally.