A nurse is teaching a class about administering IV fluids to treat dehydration. Which of the following findings should the nurse include in the teaching as an indicator of effective treatment of dehydration?

Dehydration, or fluid volume deficit, occurs when the output of body fluids exceeds intake, causing hypovolemia and cellular desiccation. Effective rehydration therapy restores intravascular volume and cellular hydration, evidenced by the normalization of physical assessment parameters and laboratory values. Maintaining homeostatic electrolyte balance is critical for preventing cardiovascular collapse and multi-organ dysfunction. Rationale: A. Reports of thirst indicate that the body is still experiencing a fluid deficit. The hypothalamus triggers the thirst mechanism in response to increased serum osmolality or decreased blood volume. Therefore, thirst is a sign of ongoing dehydration rather than an indicator that the treatment has been effective or completed. B. Moist mucous membranes are a clinical indicator of adequate systemic hydration and effective treatment. During dehydration, the body conserves water by reducing secretions, leading to dry oral mucosa and poor skin turgor. The return of moisture to these tissues signifies that the interstitial and intracellular fluid compartments are being replenished. C. An increased Blood Urea Nitrogen (BUN) level is typically a laboratory sign of dehydration due to decreased renal perfusion and hemoconcentration. As rehydration therapy succeeds, the BUN should decrease as the kidneys are better perfused and the blood becomes less concentrated. An increasing BUN would suggest worsening renal function or ongoing fluid loss. D. Hypotension is a manifestation of significant hypovolemia where the reduced circulatory volume fails to maintain adequate blood pressure. Successful IV fluid administration should result in the stabilization of blood pressure within normal limits. Continued hypotension would indicate that fluid resuscitation is insufficient and the patient remains in a dehydrated state.