Hyperthyroidism hidden by congenital central hypoventilation syndrome

Area of Science:

• Pediatric Endocrinology
• Genetics
• Autonomic Neurology

Background:

• Congenital central hypoventilation syndrome (CCHS) is a rare genetic disorder caused by PHOX2B gene mutations, leading to severe central hypoventilation.
• CCHS is characterized by autonomic nervous system dysfunction, including cardiovascular, gastrointestinal, and pupillary abnormalities.
• Autonomic dysfunction in CCHS typically manifests as hypoventilation, bradycardia, and temperature dysregulation.

Observation:

• A pediatric patient with a confirmed diagnosis of CCHS presented with persistent tachycardia.
• Extensive investigations were conducted over several months to determine the cause of the tachycardia.
• The tachycardia was ultimately attributed to the development of Grave's disease, a form of hyperthyroidism.

Findings:

• This is the first reported case of a pediatric patient with Congenital central hypoventilation syndrome (CCHS) concurrently diagnosed with Grave's disease.
• The co-occurrence of CCHS and hyperthyroidism highlights potential complex interactions within autonomic nervous system regulation.
• The PHOX2B gene mutation in CCHS may influence susceptibility or presentation of other endocrine disorders.

Implications:

• This case expands the known clinical spectrum of CCHS beyond respiratory and autonomic dysfunction.
• It suggests the need for broader differential diagnoses in CCHS patients presenting with unexplained symptoms like tachycardia.
• Further research is warranted to explore potential genetic or physiological links between CCHS and thyroid disorders.