Rett syndrome: discrimination of typical and variant forms

Area of Science:

• Neurology
• Genetics
• Pediatrics

Background:

• Rett syndrome is a rare neurodevelopmental disorder primarily affecting females.
• Diagnostic criteria have been established, but clinical variants present challenges.

Purpose of the Study:

• To assess the utility of biochemical and neurodiagnostic methods in diagnosing Rett syndrome.
• To evaluate diagnostic support for typical and variant cases of Rett syndrome.

Main Methods:

• Clinical assessment of 18 female patients with Rett syndrome features.
• Biochemical analysis of cerebrospinal fluid for biogenic amine metabolites.
• Neurodiagnostic evaluation including respiratory, sleep, and electroencephalogram (EEG) pattern analysis.

Main Results:

• Fifteen patients met established criteria for typical Rett syndrome.
• Biochemical and neurodiagnostic findings supported the diagnosis in typical cases.
• Diagnostic modalities were less effective for three patients with clinical variants.

Conclusions:

• Current diagnostic approaches, including biochemical and neurodiagnostic tests, are valuable for typical Rett syndrome.
• Clinical assessment remains crucial, especially for variant presentations.
• The absence of a molecular marker necessitates continued reliance on clinical evaluation for definitive diagnosis.