1. What is Cardiac Index?

Cardiac Index (CI) is a hemodynamic parameter that relates cardiac output (CO) to body surface area (BSA), thus normalizing cardiac output for differences in body size. It provides a more accurate assessment of cardiac performance than cardiac output alone.

2. How Does the Calculator Work?

The calculator uses the Cardiac Index formula:

Where:

• \( CI \) — Cardiac Index (L/min/m²)
• \( CO \) — Cardiac Output (L/min)
• \( BSA \) — Body Surface Area (m²)

Explanation: This calculation adjusts cardiac output for body size, providing a standardized measure of cardiac function that can be compared across individuals of different sizes.

3. Importance of Cardiac Index Calculation

Details: Cardiac Index is crucial for assessing cardiac function in clinical settings, particularly in critical care, cardiology, and during surgical procedures. It helps in diagnosing and managing various cardiac conditions and guiding treatment decisions.

4. Using the Calculator

Tips: Enter cardiac output in L/min and body surface area in m². Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal Cardiac Index range?
A: The normal Cardiac Index range is typically 2.5-4.2 L/min/m² for adults at rest. Values below this range may indicate cardiac dysfunction.

Q2: How is Cardiac Output measured?
A: Cardiac Output can be measured using various methods including echocardiography, thermodilution, Fick principle, or pulse contour analysis.

Q3: How is Body Surface Area calculated?
A: BSA is commonly calculated using formulas such as the Du Bois formula: BSA = 0.007184 × weight^0.425 × height^0.725, where weight is in kg and height is in cm.

Q4: Why is Cardiac Index important in critical care?
A: In critical care, Cardiac Index helps assess the adequacy of tissue perfusion, guide fluid management, and evaluate response to inotropic or vasoactive medications.

Q5: Does Cardiac Index change with age?
A: Yes, Cardiac Index tends to decrease with age due to reduced cardiac compliance and changes in vascular function, though the normal range remains similar throughout adulthood.