ROHHAD
Rare condition of rapid obesity, breathing failure, and autonomic issues.
ROHHAD (Rapid-onset obesity with hypothalamic dysregulation, hypoventilation, and autonomic dysregulation) is a rare medical condition of unknown etiology that primarily affects the endocrine system and autonomic nervous system. It is distinguished from congenital central hypoventilation syndrome (CCHS) by the presence of both alveolar hypoventilation and hypothalamic dysfunction. With only 100 reported cases worldwide, ROHHAD is considered a rare disease that can be fatal if undiagnosed and untreated.
Quick Facts
- Symptoms
- rapid onset obesity, hypothalamic dysfunction, hypoventilation, autonomic dysfunction, neuroendocrine tumors, behavior problems
- Onset
- 1.5-11 years of age
- Causes
- unknown
- Frequency
- 158 cases reported worldwide
Facts from the source article.
Lore & Background
The first sign of ROHHAD is rapid weight gain of 20-30 pounds over 6-12 months, occurring between 1.5 and 11 years of age. This is typically followed by alveolar hypoventilation, a condition where blood oxygen levels become dangerously low and the brain fails to trigger breathing in response. Hypoventilation is usually present only during sleep, but in severely affected patients it may continue throughout the day. Ventilatory support is required during sleep for all patients, and during waking hours for about half of them.
Reader's Guide
ROHHAD's significance lies in its complexity and the critical importance of early diagnosis. The disease presents with a diverse set of symptoms—including hypothalamic dysfunction (sodium imbalances, abnormal puberty, low thyroid hormone), autonomic dysfunction (temperature regulation issues, cardiac rhythm abnormalities, digestive problems), and neuroendocrine tumors in about 40% of patients. Because symptoms vary widely, ROHHAD is often misdiagnosed as Cushing's disease or congenital central hypoventilation syndrome. There is no cure; treatment focuses on managing individual symptoms, particularly hypoventilation and hypothalamic dysfunction, as these are most likely to cause death or behavioral problems. Behavioral issues and intellectual disability may arise from low oxygen levels during development, especially with late diagnosis. The cause remains unknown, though a combination of genetic, environmental, or immunological factors is suspected. A case of monozygotic twins—one affected, one not—has raised questions about purely genetic inheritance, suggesting possible autoimmune or epigenetic origins.
Did You Know?
- ROHHAD is fatal in 50-60% of cases when undiagnosed and untreated, usually due to cardiopulmonary arrest from untreated hypoventilation.
- Approximately 40% of ROHHAD patients develop neuroendocrine tumors such as ganglioneuromas or ganglioneuroblastomas.
- A case of monozygotic twins with divergent ROHHAD phenotypes has been reported, with one twin affected and the other developing normally.
- The rapid weight gain in ROHHAD is defined as 20-30 pounds over a 6-12 month period.
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