What happens to the vascular system when colloid solutions are administered?

When colloid solutions are administered, the primary effect on the vascular system is the expansion of the vascular compartment. Colloids are solutions that contain large molecules, such as proteins or starches, which are unable to easily cross capillary membranes. This property allows colloids to draw fluid into the vascular space from surrounding tissues, effectively increasing intravascular volume.

As a result, the administration of colloid solutions helps to maintain or increase blood pressure by increasing the volume of blood within the blood vessels. This can be particularly beneficial in situations where there is significant fluid loss or hypovolemia, such as in cases of severe dehydration or hemorrhage. In contrast to other options, the use of colloids can actually help to reduce edema because they draw fluid into the vascular space rather than allowing it to remain and accumulate in the interstitial tissues.