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EXPLANATION
✔Correct answer:
Isotonic Fluid Volume Deficit (FVD). Isotonic Fluid Volume Deficit (FVD), also known as isotonic dehydration, is characterized by an equal decrease in extracellular fluid solute and water volume. In this condition, there is a proportional loss of water and electrolytes from the extracellular compartment, resulting in a reduction of overall blood volume without altering the concentration of electrolytes.
Isotonic FVD occurs when the body loses fluids and electrolytes in the same proportion, maintaining the osmolarity of the extracellular fluid. Common causes include gastrointestinal losses (e.g., vomiting, diarrhea), hemorrhage, and excessive sweating. This type of dehydration does not lead to shifts of water between the intracellular and extracellular compartments, as the tonicity (concentration) remains unchanged.
Imagine a water balloon filled with a mixture of water and salt. If you make a small hole and let the mixture leak out, both water and salt leave in equal proportions, keeping the remaining solution inside the balloon the same in concentration, but with less volume.
Nurses should assess for signs of isotonic FVD, such as dry mucous membranes, decreased skin turgor, hypotension, and tachycardia. Management involves replacing lost fluids with isotonic solutions, such as normal saline, and addressing the underlying cause of fluid loss.
- Monitor vital signs: Regularly check blood pressure, heart rate, and temperature to assess for signs of hypovolemia.
- Assess for dehydration: Look for clinical signs like dry mucous membranes, decreased skin turgor, and reduced urine output.
- Administer IV fluids: Provide isotonic fluids such as normal saline or lactated Ringer’s solution to replenish extracellular fluid volume.
- Monitor intake and output: Keep accurate records of fluid intake and output to ensure adequate fluid replacement.
- Educate the patient: Teach the patient about the importance of maintaining hydration, especially in conditions that can lead to fluid loss.
✘Incorrect answer options:
Hypotonic Fluid Volume Deficit (FVD). Hypotonic FVD involves a greater loss of electrolytes than water, leading to decreased osmolarity of the extracellular fluid and causing water to shift into cells, potentially leading to cellular edema.
Hypertonic Fluid Volume Deficit (FVD). Hypertonic FVD involves a greater loss of water than electrolytes, leading to increased osmolarity of the extracellular fluid and causing water to shift out of cells, potentially leading to cellular dehydration.
Isotonic Fluid Volume Excess (FVE). Isotonic FVE, or hypervolemia, is characterized by an equal increase in extracellular fluid solute and water volume, typically resulting from conditions like heart failure, renal failure, or excessive IV fluid administration.
References
- Ignatavicius, D. D., Workman, M. L., Rebar, C. R., & Heimgartner, N. M. (2018). Medical-Surgical Nursing: Concepts for Interprofessional Collaborative Care. Elsevier.
- Lewis, S. L., Bucher, L., Heitkemper, M. M., & Harding, M. M. (2017). Medical-Surgical Nursing: Assessment and Management of Clinical Problems. Elsevier.