Which is following is a common complication of untreated congenital hypothyroidism

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Pediatric Nursing

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Explanation

Thyroid hormones are absolutely essential for the normal growth, development, and myelination of the central nervous system in a newborn.
The most critical period for brain development is from birth through the first 2-3 years of life.
In untreated congenital hypothyroidism, the lack of thyroid hormone during this critical window leads to severe and irreversible intellectual disability (formerly known as mental retardation or cretinism).
This makes it the most common preventable cause of intellectual disability worldwide, highlighting the importance of newborn screening.

Option B: Diabetes mellitus is a disorder of glucose metabolism caused by insulin deficiency or resistance. It is a separate endocrine disorder and is not a complication of congenital hypothyroidism.
Option C: While severe, long-standing hypothyroidism in adults can cause cardiac issues like bradycardia, pericardial effusion, and decreased contractility (cardiomyopathy), it is not the primary and most devastating complication of the untreated congenital form. The neurological damage is far more significant and irreversible.
Option D: Asthma is a chronic inflammatory respiratory disease, typically involving allergic and immune-mediated pathways. It has no direct pathophysiological link to thyroid hormone deficiency.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Complications of untreated congenital hypothyroidism as background academic context rather than a clinical decision trigger.
The cornerstone of preventing this complication is the mandatory newborn screening program, where a heel-prick blood sample is tested for TSH levels within a few days of birth.
Nurses play a vital role in ensuring the screening is performed, educating parents about the importance of follow-up if results are abnormal, and teaching them about lifelong hormone replacement therapy if a diagnosis is confirmed.
Patient safety is paramount; early detection and treatment (ideally within the first month of life) with levothyroxine ensures normal neurocognitive outcomes.

How to Approach the Question

First, identify the core concepts in the question: the condition is 'congenital hypothyroidism,' the state is 'untreated,' and the question asks for a 'common complication.'
Recall the primary function of thyroid hormone in the neonatal period. Its most critical role is in central nervous system development.
Evaluate each option based on this primary function. Mental retardation (intellectual disability) is a direct consequence of impaired brain development due to hormone deficiency.
Analyze the distractors. Diabetes, cardiomyopathy, and asthma have different pathophysiological origins (pancreatic, cardiac, respiratory/immune) and are not the primary, defining complication of untreated congenital hypothyroidism.
Select the option that represents the most severe and direct consequence of the untreated condition in this specific population (newborns).

Concept Tested & Keywords

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E6 Medicine Davidson Principles Practice 24e p. 670-672

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1211-1213