Which solution causes the shifting of fluid from the cell to the intravascular compartment?

NORCET 2 -2021 (Shift-2)

Applied Physiology

Easy

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

A hypertonic solution has a higher solute concentration (osmolality) than the intracellular fluid.
Due to osmosis, water is drawn out of the cells and into the more concentrated intravascular space to balance the solute concentrations.
This results in the cells shrinking and an expansion of the intravascular fluid volume.
Examples of hypertonic solutions include 3% Sodium Chloride, Dextrose 10% in Water (D10W), and Dextrose 5% in 0.9% Saline (D5NS).

Option A: Isotonic solutions have the same solute concentration as intracellular fluid. Therefore, they do not create a significant osmotic gradient and cause no net movement of fluid between compartments.
Option C: Hypotonic solutions have a lower solute concentration than intracellular fluid. They cause fluid to shift from the intravascular compartment into the cells, causing them to swell.
Option D: Diffusion is the movement of solutes (particles like sodium or glucose) from an area of higher concentration to an area of lower concentration. The question asks about the movement of fluid (water), which is primarily governed by osmosis.

Visual 1: Diagram - An illustration showing red blood cells in isotonic, hypotonic, and hypertonic solutions. This visually demonstrates cell shrinking (crenation) in a hypertonic solution, no change in an isotonic solution, and swelling/lysis in a hypotonic solution.
Visual 2: Flowchart - A chart illustrating the direction of water movement between the intracellular and extracellular (intravascular) compartments when each type of solution is administered.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Tonicity of IV Solutions and Fluid Shifts as background academic context rather than a clinical decision trigger.
Administering the correct type of IV fluid is critical for patient safety. Using the wrong solution can lead to serious complications like cerebral edema (with hypotonic solutions) or osmotic demyelination syndrome and heart failure (with rapid administration of hypertonic solutions).
Nurses must carefully monitor patients receiving hypertonic solutions for signs of fluid volume overload, such as crackles in the lungs, shortness of breath, and edema, as well as for changes in neurological status and serum sodium levels.
What if? If a patient with severe hyponatremia (low sodium) and cerebral edema was given a hypotonic solution instead of a hypertonic one, the fluid would shift into the already swollen brain cells, worsening the cerebral edema and potentially leading to brain herniation and death.

How to Approach the Question

First, identify the key terms in the question: 'shifting of fluid,' 'from the cell,' and 'to the intravascular compartment.' This describes water moving out of cells.
Next, recall the principle of osmosis: water moves from an area of lower solute concentration to an area of higher solute concentration.
For water to move out of a cell, the solution outside the cell (in the intravascular compartment) must have a higher concentration of solutes.
Review the definitions of the options: Isotonic (same concentration), Hypertonic (higher concentration), and Hypotonic (lower concentration).
Conclude that a hypertonic solution, by definition, has a higher concentration and will pull fluid out of the cells.
Differentiate osmosis (water movement) from diffusion (solute movement) to eliminate the 'Diffusion' option.

Concept Tested & Keywords

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