What is the mean hydrostatic pressure of the capillary?

The mean hydrostatic pressure of the capillary is approximately 25 mmHg. This value is crucial for understanding the mechanisms of fluid exchange between capillaries and interstitial spaces. Hydrostatic pressure in the capillary drives the movement of fluids out of the capillaries and into the surrounding tissues.

In healthy capillary beds, the hydrostatic pressure is much lower than that in arterial systems, reflecting its role in filtration rather than high-pressure blood flow. This lower pressure allows for a controlled exchange of nutrients, waste products, and oxygen, while preventing excessive leakage of fluids.

A mean hydrostatic pressure of 25 mmHg also helps maintain the balance with oncotic pressure, which draws fluid back into the capillaries. This interplay is vital for keeping proper fluid dynamics in tissues. Understanding this concept is important for perfusionists as they manage fluid administration and assess patient hemodynamics during procedures.