Cardiac index
From Self-sufficiency
Cardiac index (CI) is a vasodynamic parameter that relates the cardiac output (CO) to body surface area (BSA),[1] thus relating heart performance to the size of the individual. The unit of measurement is litres per minute per square metre (l/min/m2).
Calculation
The index is usually calculated using the following formula:
- <math>CI = \frac{CO}{BSA} = \frac{SV*HR}{BSA}</math>
where
- CI=Cardiac index
- BSA=Body surface area
- SV=Stroke volume
- HR=Heart rate
- CO=Cardiac output
Clinical significance
The normal range of cardiac index is 2.6 - 4.2 L/min per square meter.
If the CI falls below 1.8 L/min/m², the patient may be in cardiogenic shock.
References
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- ↑ "Cardiac Catheterization: Cardiovascular Tests and Procedures: Merck Manual Professional". Retrieved 2009-03-06.
