Multidimensional Development and Adaptive Behavioral Functioning in Younger and Older Children With Rett Syndrome

Area of Science:

• Neurology
• Developmental Pediatrics
• Genetics

Background:

• Rett syndrome (RTT) is a rare genetic neurodevelopmental disorder.
• Stage III RTT, the pseudostationary stage, is characterized by significant motor and cognitive impairments.
• Understanding age-related differences and clinical severity is crucial for targeted interventions.

Purpose of the Study:

• To investigate clinical severity, multidimensional development, and adaptive functioning in younger and older children with stage III RTT.
• To identify age-specific differences in developmental trajectories and behavioral skills.
• To establish correlations between clinical severity and functional outcomes.

Main Methods:

• A cohort of 29 children with stage III RTT was divided into younger (≤10 years) and older (11-18 years) groups.
• Clinical severity was assessed using the Clinical Severity Score (CSS).
• Developmental assessments included the Mullen Scales of Early Learning (MSEL) and Early Social Communication Scale (ESCS). Adaptive functioning was evaluated using the Vineland Adaptive Behavior Scales (VABS-C) and Pediatric Evaluation of Disability Inventory (PEDI-C).

Main Results:

• The older RTT group exhibited higher scoliosis severity (CSS) and poorer fine motor skills (MSEL) compared to the younger group.
• Reduced social interaction skills, including eye contact and turn-taking (ESCS), were noted in older children.
• No significant differences in adaptive behavior (VABS-C, PEDI-C) were found between age groups, but higher CSS correlated with lower scores across multiple functional domains.

Conclusions:

• Age-related disparities exist in fine motor and sociocommunicative skills in stage III RTT.
• Increased clinical severity in RTT is associated with poorer motor, sociocommunicative, and adaptive functioning.
• These findings underscore the need for age-specific therapeutic approaches in managing RTT.