A patient with diabetes insipidus is receiving vasopressin. Which finding shows the treatment is working?& x2… - NORCET 9 Mains - 2025

NORCET 9 Mains - 2025

Medical Surgical Nursing

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Appeared in: NORCET 9 Mains - 2025

Explanation

Diabetes Insipidus (DI) is characterized by the excretion of large amounts of dilute urine, resulting in a very low urine specific gravity (often below 1.005).
Vasopressin is a synthetic form of Antidiuretic Hormone (ADH) that works by increasing water reabsorption in the kidneys, thus concentrating the urine.
A urine specific gravity of 1.015 falls within the normal range (1.005-1.030), indicating that the kidneys are successfully concentrating urine.
This normalization of urine specific gravity is a direct and reliable measure of vasopressin's therapeutic effect.

Option A: Increased thirst (polydipsia) is a primary symptom of DI, caused by dehydration from excessive water loss. If thirst is increasing, it means the treatment is failing to correct the fluid imbalance.
Option B: Significant weight loss reflects ongoing, uncompensated fluid loss. Effective treatment should lead to weight stabilization or a slight gain as the patient rehydrates.
Option C: High urine output (polyuria) is the cardinal sign of DI. The goal of vasopressin is to decrease urine output. If it remains high, the treatment is ineffective.

Visual 1: Diagram: Action of ADH on the kidney's collecting duct, showing how it facilitates water reabsorption.
Visual 2: Chart: Comparing lab values (Urine Specific Gravity, Urine Osmolality, Serum Sodium) in a healthy individual versus a patient with untreated DI and a patient on effective vasopressin therapy.

Clinical Relevance

Nursing practice connection: Use the key finding related to Evaluation of treatment effectiveness for Diabetes Insipidus to guide bedside assessment, documentation, and the next nursing action.
Nurses must meticulously monitor fluid intake and output, daily weight, and urine specific gravity for patients with DI to assess treatment efficacy and prevent complications.
Patient education is crucial, focusing on the signs of both undertreatment (dehydration, thirst, high urine output) and overtreatment (fluid overload, headache, hyponatremia).
What if the patient's urine specific gravity was 1.035? This would indicate the urine is too concentrated, suggesting an excessive dose of vasopressin, which could lead to water intoxication and dangerous hyponatremia. The nurse should report this finding and anticipate a dose reduction.

How to Approach the Question

First, identify the core pathophysiology: Diabetes Insipidus (DI) is a lack of ADH, leading to water loss and dilute urine.
Next, understand the drug's mechanism: Vasopressin is ADH replacement, so it should reverse the pathophysiology by helping the body retain water and concentrate urine.
Predict the expected outcome of successful treatment: Urine output should decrease, thirst should lessen, and urine should become more concentrated (higher specific gravity).
Evaluate each option against this prediction. Options A, B, and C describe the symptoms of untreated DI.
Option D, a normal urine specific gravity, directly reflects the desired therapeutic effect of vasopressin.

Concept Tested & Keywords

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