A disorder caused by a lack of insulin?

AIIMS Nagpur NO - 2018

Medical & Surgical Nursing

Easy

Appeared in: AIIMS Nagpur NO - 2018

Explanation

Diabetes Mellitus is a metabolic disease defined by an absolute or relative deficiency of insulin.
This deficiency can be due to the destruction of pancreatic beta cells (Type 1 DM), which stops insulin production, or due to the body's cells not responding to insulin properly, known as insulin resistance (Type 2 DM).
The lack of insulin action prevents the efficient uptake and use of glucose by most body cells, leading to elevated blood glucose levels (hyperglycemia).
Classic symptoms that arise from hyperglycemia and the body's attempt to compensate include polyuria (excessive urination), polydipsia (excessive thirst), and polyphagia (excessive hunger).

Option A: Diabetes Insipidus is not related to insulin. It is a disorder of water balance caused by a deficiency of antidiuretic hormone (ADH) or the kidneys' inability to respond to ADH.
Option C: Goiter is an enlargement of the thyroid gland. It is most commonly caused by iodine deficiency and is unrelated to insulin or the pancreas.
Option D: Hypercortisolism, also known as Cushing's syndrome, is a condition caused by prolonged exposure to high levels of the hormone cortisol. It is not caused by a lack of insulin.

Visual 1: Diagram - Illustrating the role of the pancreas and insulin in regulating blood glucose. One panel shows normal function (insulin helps glucose enter cells), and another panel shows Diabetes Mellitus (glucose stays in the blood due to lack of insulin).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pathophysiology of Endocrine Disorders as background academic context rather than a clinical decision trigger.
A core nursing responsibility is differentiating between the 'two diabetes.' While both may present with polydipsia and polyuria, the underlying cause (insulin vs. ADH) and treatment are completely different. Misidentification can be life-threatening.
Nurses must educate patients that Type 1 Diabetes is an absolute lack of insulin requiring lifelong insulin therapy, whereas Type 2 often begins with insulin resistance and may be managed initially with lifestyle changes and oral medications.
What if? A patient complains of extreme thirst and frequent urination, but their blood glucose level is normal. This clinical picture should prompt the nurse to consider Diabetes Insipidus and assess for other signs like hypernatremia and low urine specific gravity, rather than focusing on insulin-related interventions.

How to Approach the Question

This is a factual recall question that tests your knowledge of endocrine disorders.
First, identify the key phrase in the question: 'lack of insulin'.
Next, systematically review the options and recall the primary hormone or cause associated with each disorder.
Option A, Diabetes Insipidus, is linked to Antidiuretic Hormone (ADH).
Option B, Diabetes Mellitus, is directly linked to insulin.
Option C, Goiter, is linked to the thyroid gland and iodine.

Concept Tested & Keywords

QT-MkXfM1WtiLzd2WcCUpI