The formula to calculate the Extracellular Volume (ECV) is:
\[ ECV = TBW - ICV \]
Where:
Let's say the total body water (\( TBW \)) is 42 liters and the intracellular volume (\( ICV \)) is 28 liters. Using the formula:
\[ ECV = TBW - ICV = 42 - 28 = 14 \text{ liters} \]
So, the Extracellular Volume (\( ECV \)) is 14 liters.
Extracellular volume (ECV) refers to the volume of fluid outside the cells in the body. This fluid includes interstitial fluid, plasma, and transcellular fluid. The extracellular volume is crucial for maintaining the balance of electrolytes and other substances between the cells and their environment. It plays a vital role in various physiological processes, including nutrient transport, waste removal, and maintaining blood pressure. Understanding the extracellular volume is essential in medical fields such as nephrology and cardiology, where fluid balance is critical for patient care.
Definition: This calculator estimates the extracellular volume (ECV) fraction using MRI data.
Formula: \( \text{ECV} = \frac{1 - \text{Hematocrit}}{\text{Post-Contrast T1} - \text{Pre-Contrast T1}} \)
Example: \( \text{ECV} = \frac{1 - 0.45}{500 - 1000} \)
Definition: This calculator determines the volume of a unit cell in crystallography.
Formula: \( V = a \times b \times c \times \sqrt{1 - \cos^2 \alpha - \cos^2 \beta - \cos^2 \gamma + 2 \cos \alpha \cos \beta \cos \gamma} \)
Example: \( V = 5 \times 5 \times 5 \times \sqrt{1 - \cos^2 90^\circ - \cos^2 90^\circ - \cos^2 90^\circ + 2 \cos 90^\circ \cos 90^\circ \cos 90^\circ} \)
Definition: This formula calculates the volume of a tumor based on its dimensions.
Formula: \( V = \frac{\pi}{6} \times L \times W \times H \)
Example: \( V = \frac{\pi}{6} \times 4 \times 3 \times 2 \)
