Benign and periodic movement disorders in 2 children with Down syndrome

Area of Science:

• Neurology
• Pediatrics
• Genetics

Background:

• Children with Down syndrome often exhibit hypotonia and ligamentous laxity, contributing to motor development delays.
• Neurologic disorders are prevalent in Down syndrome, yet periodic movement disorders remain underreported in the literature.

Observation:

• Two infants with Down syndrome presented with distinct periodic movement disorders.
• Case 1: An 8-month-old girl displayed involuntary head nodding without other neurological or ophthalmological issues.
• Case 2: A 6-month-old boy exhibited painless, alternating head rotation and inclination, sometimes accompanied by general uneasiness.

Findings:

• The study describes two novel cases of periodic movement disorders in infants with Down syndrome.
• Observed movements included involuntary head nodding and abnormal head rotation/inclination.
• Neurological examinations between episodes were normal in both infants.

Implications:

• This research introduces the concept of periodic movement disorders in Down syndrome.
• Early recognition and management strategies for these movement disorders are crucial.
• Further investigation is warranted to understand the prevalence and underlying mechanisms of movement disorders in Down syndrome.