What is the D.O.C (Drug of Choice) for Diabetes Insipidus?

Appeared in: Bihar CHO - 2021

Explanation

Desmopressin is the drug of choice for central diabetes insipidus (DI).
It is a synthetic analog of the natural antidiuretic hormone (ADH), also known as vasopressin.
Its primary function is to decrease urine production by increasing water reabsorption in the kidneys' collecting ducts.
This action helps to manage the main symptoms of DI, which are excessive thirst (polydipsia) and the excretion of large volumes of dilute urine (polyuria).

Option B: Insulin is a hormone used to treat Diabetes Mellitus, not Diabetes Insipidus. It regulates blood sugar (glucose) levels.
Option C: Metformin is an oral hypoglycemic agent used for Diabetes Mellitus. It has no role in treating the water imbalance seen in Diabetes Insipidus.
Option D: Glimepiride is a sulfonylurea drug that stimulates the pancreas to release insulin. It is used for Diabetes Mellitus, not Diabetes Insipidus.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological management of Diabetes Insipidus helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A key nursing responsibility is to differentiate between Diabetes Mellitus (DM) and Diabetes Insipidus (DI). While both can present with polyuria and polydipsia, their pathophysiology and management are entirely different. Confusing the two can lead to life-threatening medication errors.
When administering Desmopressin, nurses must meticulously monitor the patient's fluid intake, urine output, and serum sodium levels. A major risk is water intoxication and hyponatremia if the dose is too high or fluid intake is excessive.
Patient education is critical. The nurse must teach the patient and family about the signs of both dehydration (indicating under-dosing) and water intoxication (indicating over-dosing), such as headache, nausea, and confusion.

How to Approach the Question

First, identify the core condition in the question: 'Diabetes Insipidus'.
Recognize the common confusion between 'Diabetes Insipidus' and 'Diabetes Mellitus'. The term 'Insipidus' refers to tasteless/dilute urine, whereas 'Mellitus' refers to sweet/sugary urine.
Recall the pathophysiology of Central DI: a deficiency of the antidiuretic hormone (ADH).
Evaluate the options based on this pathophysiology. The logical treatment is to replace the deficient hormone.
Desmopressin is a synthetic form of ADH. Therefore, it is the correct choice.
Eliminate the other options (Insulin, Metformin, Glimepiride) as they are all treatments for Diabetes Mellitus, which is related to blood sugar control, not water balance.

Concept Tested & Keywords

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 537-539

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1177-1179

Practise the full Bihar CHO - 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.