Intravascular Space

A capillary membrane which consists of the endothelial glycocalyx endothelial cells and the subendothelial cell matrix separates the capillary intravascular space from the interstitial fluid compartment.

Intravascular space. Clinically as effective as colloid preload for preventing hypotension from spinal anaesthesia for caesarean delivery. In a 70kg adult the intracellular space holds approximately 23 litres of fluid in comparison to 17 litres in the extracellular space where 5 litres of blood volume is in the intravascular space amato et al 2008. The hydrostatic pressure in the intravascular space pc is the principle force driving water and electrolytes out of the capillary into the interstitial space. The main intravascular fluid in mammals is blood a complex mixture with elements of a suspension blood cells colloid and solutes glucose and ions.

The blood represents both the intracellular compartment the fluid inside the blood cells and the extracellular compartment the blood plasma. The average volume of plasma in the average 70 kilogram or 150 pound male is approximately 3 5 liters 0 77 imp gal. Haemodialysis dry weight assessment. Fluid movement from the intravascular to interstitial and intracellular compartments occurs in the capillaries.

There are three major fluid compartments.