In which type of solution does the fluid shift from tissues to blood?

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Applied Physiology

Medium

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

A hypertonic solution has a higher solute concentration than the body's cells and tissues.
Due to osmosis, water moves from an area of lower solute concentration (tissues) to an area of higher solute concentration (the bloodstream containing the hypertonic solution).
This process causes fluid to shift from the tissues into the blood, leading to a decrease in tissue swelling and an increase in intravascular volume.
This effect is utilized clinically to treat conditions like cerebral edema, where reducing tissue fluid is critical.

Option B: A hypotonic solution has a lower solute concentration than the tissues. It causes fluid to shift in the opposite direction, from the blood into the tissues and cells, causing them to swell.
Option C: An isotonic solution has the same solute concentration as the tissues. It does not cause a significant fluid shift between the tissues and the blood. Its primary purpose is to expand the volume of the extracellular fluid without changing its composition.
Option D: This option is incorrect because one of the other options accurately describes the process.

Clinical Relevance

Nursing practice connection: Knowing Fluid shifts and tonicity of solutions helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must understand tonicity to safely administer intravenous (IV) fluids. Administering the wrong type of solution can lead to serious complications like cerebral edema, fluid overload, or cellular dehydration.
Careful monitoring of patients receiving hypertonic solutions is crucial. The nurse must assess for signs of intravascular fluid overload, such as hypertension, bounding pulse, and pulmonary edema (crackles in the lungs).
What if? If a patient with severe dehydration (where both water and electrolytes are lost) is given a hypertonic solution, it would worsen the cellular dehydration by pulling even more water out of the cells, potentially leading to organ dysfunction. In this case, an isotonic solution would be the appropriate initial choice.

How to Approach the Question

First, analyze the question to identify the direction of fluid movement: 'from tissues to blood'.
Recall the principle of osmosis: water moves from an area of lower solute concentration to an area of higher solute concentration.
For fluid to move from tissues (cells) to the blood, the solution in the blood must have a higher solute concentration than the tissues.
Review the definitions of the solution types: Hypertonic (higher concentration), Hypotonic (lower concentration), and Isotonic (same concentration).
Match the required condition (higher concentration in blood) with the correct term. A hypertonic solution is the one that has a higher concentration, thus pulling fluid from tissues to the blood.
Select the option that matches this conclusion.

Concept Tested & Keywords

Qg-DeAgigqlpSmzrbN89pP

E6 Pharmacology Nursing Lilley 11e Part 2 p. 160-162

E6 Physiology Guyton 4SAE Part 1 p. 90-92

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 1 p. 142-144