Final height in long-term primary hypothyroid children

Area of Science:

• Pediatric Endocrinology
• Growth and Development
• Thyroid Disorders

Background:

• Primary hypothyroidism in children can significantly impair statural growth.
• Early diagnosis and treatment are crucial for optimizing growth outcomes.
• Understanding the impact of treatment timing on final height is essential.

Purpose of the Study:

• To retrospectively analyze the statural growth and bone maturation in children with primary hypothyroidism.
• To correlate final height with chronological age, height deficit, and bone age at treatment initiation.
• To evaluate the influence of treatment timing (prepubertal vs. pubertal) on achieving target height.

Main Methods:

• Retrospective study of 32 children diagnosed with primary hypothyroidism.
• Patients were categorized into three groups based on age at treatment initiation: early childhood (G1), late childhood (G2), and puberty (G3).
• Final height was compared to target height, with analysis of height deficits and bone age progression.

Main Results:

• Children treated before puberty (G1 and G2) achieved final heights comparable to their target heights (SDS G1: -1.05 +/- 0.89; G2: -1.2 +/- 1).
• Children treated during puberty (G3) did not reach their target height (SDS G3: -2 +/- 1.5), with a statistically significant difference (p < 0.04).
• Bone age advancement varied, with prepubertal groups showing better catch-up potential.

Conclusions:

• Treatment of primary hypothyroidism initiated before puberty allows for attainment of normal adult height relative to genetic potential.
• Puberty is a critical period, and its onset in untreated or inadequately treated hypothyroid children significantly hinders catch-up growth.
• Timely intervention in pediatric hypothyroidism is paramount for achieving optimal growth outcomes.