cardiac index
Cardiac output normalized to body surface area, measuring heart's pumping efficiency.
Full Definition
Cardiac index is a hemodynamic parameter that represents cardiac output normalized to body surface area, expressed in liters per minute per square meter (L/min/m²). Normal cardiac index ranges from 2.5 to 4.0 L/min/m². In emergency cardiology, cardiac index is used to assess the severity of heart failure and cardiogenic shock, with values below 2.2 L/min/m² indicating significant cardiac dysfunction. The measurement can be obtained through various methods including thermodilution, echocardiography, or non-invasive cardiac output monitors. Cardiac index provides a more accurate assessment than cardiac output alone by accounting for patient size.
Usage
Usage note: Always include units (L/min/m²) when reporting values.
In Context
- "The patient's cardiac index of 1.8 L/min/m² indicated severe cardiogenic shock." — Hemodynamic assessment report
- "Swan-Ganz catheterization revealed a depressed cardiac index requiring inotropic support." — Cardiology consultation