NORCET 2 - 2021 (shift-1)
Medical & Surgical Nursing
Easy
In moderate dehydration, which is the fluid of choice?
Appeared in: NORCET 2 - 2021 (shift-1)
Explanation
- Normal Saline (NS, 0.9% NaCl) is an isotonic crystalloid solution, meaning its salt concentration is similar to that of blood plasma.
- It is the fluid of choice for initial resuscitation in moderate dehydration because it rapidly expands the intravascular volume, helping to restore blood pressure and organ perfusion.
- Unlike dextrose solutions, NS remains in the extracellular compartment (vascular and interstitial spaces) longer, providing sustained volume expansion.
Why Other Options Were Wrong
- Option A: D-10 (10% Dextrose) is a hypertonic solution. It is not used for rehydration as it can worsen cellular dehydration by pulling water out of cells.
- Option B: D-5 (5% Dextrose) is isotonic in the bag but becomes hypotonic in the body as the dextrose is metabolized. The free water does not effectively expand the intravascular volume and can lead to hyponatremia.
- Option C: D-7.5 (7.5% Dextrose) is a hypertonic solution. It is not a standard fluid for rehydration and would be inappropriate for this purpose.
Related Visual
- Visual 1: Infographic - A chart comparing common IV fluids (NS, RL, D5W, 3% Saline) showing their tonicity (isotonic, hypotonic, hypertonic), primary uses, and nursing considerations for each.
- Visual 2: Diagram - An illustration showing the effect of isotonic, hypotonic, and hypertonic solutions on red blood cells to visualize fluid shifts in the body.
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Fluid and Electrolyte Management: Intravenous Fluid Selection for Dehydration as background academic context rather than a clinical decision trigger.
- Correct fluid selection is a critical nursing responsibility to prevent complications like cerebral edema (from hypotonic fluids) or worsening dehydration (from inappropriate hypertonic fluids).
- A nurse must constantly monitor the patient's response to fluid resuscitation, including vital signs (BP, HR), urine output, and lung sounds (for signs of fluid overload).
- What if? If the patient had severe hypernatremia along with dehydration, using NS (which contains sodium) might be debated. A hypotonic solution like 0.45% NaCl might be chosen instead, but this would be done cautiously under close monitoring to correct both the water deficit and the high sodium level slowly.
How to Approach the Question
- First, identify the clinical problem presented in the question: 'moderate dehydration'.
- Next, recall the primary goal of treatment for dehydration, which is to restore circulating volume in the intravascular space.
- Analyze the given options based on their tonicity and their physiological effect on the body. Ask yourself: 'Which of these fluids will best expand the blood volume without causing harmful fluid shifts?'
- Eliminate the dextrose solutions (D-5, D-10, D-7.5) as they are not primary resuscitation fluids. D-5 becomes hypotonic in the body, and D-10/D-7.5 are hypertonic solutions used for other specific purposes like hypoglycemia.
- Identify Normal Saline (NS) as the standard isotonic crystalloid used for volume expansion, making it the correct choice for initial rehydration.
Concept Tested & Keywords
- Concept Tested: Fluid and Electrolyte Management: Intravenous Fluid Selection for Dehydration
- Stem keywords: moderate dehydration, fluid of choice
- Lead-in keywords: which is
Question ID
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