Which is one of the primary causes of diabetes insipidus?

ESIC Nursing Officer 2016 (shift-1)

Medical & Surgical Nursing

Easy

Appeared in: ESIC Nursing Officer 2016 (shift-1)

Explanation

Diabetes Insipidus (DI) is a disorder characterized by excessive thirst and excretion of large volumes of dilute urine.
The central form of DI is caused by a deficiency of Antidiuretic Hormone (ADH), also known as vasopressin.
ADH is stored and released by the posterior lobe of the pituitary gland.
Therefore, damage or disease affecting the posterior pituitary (e.g., tumors, head trauma, surgery) is a primary cause of central DI.

Option A: A lack of insulin causes Diabetes Mellitus, a disorder of glucose metabolism, not Diabetes Insipidus, which is a disorder of water balance.
Option C: The pancreas produces insulin and glucagon to regulate blood sugar. It is not involved in the production or release of ADH, the hormone central to Diabetes Insipidus.
Option D: Over-secretion of insulin leads to hypoglycemia (low blood sugar), which has symptoms like shakiness, sweating, and confusion. It does not cause the polyuria and polydipsia characteristic of Diabetes Insipidus.

Visual 1: Diagram: An illustration of the hypothalamus-pituitary axis, highlighting the production of ADH in the hypothalamus and its storage and release from the posterior pituitary. This visual clarifies the anatomical origin of central DI.
Visual 2: Flowchart: A comparison of the pathophysiology of Central DI (ADH deficiency) versus Nephrogenic DI (kidney unresponsiveness to ADH) to differentiate the two main types.
Visual 3: Table: A summary table contrasting the key features of Diabetes Insipidus and Diabetes Mellitus (hormone, organ, blood sugar, urine characteristics).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of Diabetes Insipidus as background academic context rather than a clinical decision trigger.
It is critical for nurses to distinguish between Diabetes Insipidus and Diabetes Mellitus. Misidentification can lead to incorrect treatment and severe complications like dehydration and electrolyte imbalances in DI, or hyperglycemia and ketoacidosis in DM.
Key nursing interventions for a patient with DI include meticulous monitoring of fluid intake and output, daily weights to assess fluid status, and frequent monitoring of serum sodium and urine specific gravity.
Nurses must ensure patients with DI have continuous access to water to prevent severe dehydration.

How to Approach the Question

First, identify the core subject of the question, which is 'Diabetes Insipidus'.
Recall the key difference between 'Diabetes Insipidus' (related to water balance and ADH) and 'Diabetes Mellitus' (related to sugar balance and insulin).
Analyze the options to see which relate to ADH and the pituitary gland versus those that relate to insulin and the pancreas.
Eliminate options involving insulin ('Lack of insulin', 'Over secretion of insulin') and the pancreas ('Pancreatic disorder') as they are associated with Diabetes Mellitus.
The remaining option correctly links the condition to the posterior pituitary gland, which is responsible for releasing ADH.

Concept Tested & Keywords

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