Growth patterns in children with spinal muscular atrophy

Area of Science:

• Pediatric Neuromuscular Disorders
• Growth and Development Studies
• Clinical Assessment and Management

Background:

• Spinal muscular atrophy (SMA) is a neuromuscular disorder causing muscle weakness and atrophy.
• SMA type 1 (SMA1) and type 2 (SMA2) represent severe forms with distinct functional limitations.
• Evolving standards of care and disease-modifying treatments necessitate precise nutritional status assessment.

Purpose of the Study:

• To establish disease-specific growth percentile curves for treatment-naïve SMA type 1 and type 2 patients.
• To compare the growth patterns of SMA patients with general population growth standards.
• To provide data for improved clinical management and therapeutic efficacy assessment.

Main Methods:

• Multicenter study collecting Body Weight (BW) and Supine Length (SL) data.
• Utilized a published standardized procedure for data collection.
• Developed SMA-specific growth percentile curves for BW, SL, and BMI-for-age, comparing them to WHO reference data.

Main Results:

• Recruited 133 SMA1 and 82 SMA2 patients (48.8% female).
• SMA patients exhibited significantly lower Body Weight (BW) compared to healthy peers.
• Supine Length (SL) showed more variability, and Body Mass Index (BMI) was typically lower across all ages and sexes.

Conclusions:

• The developed growth curves offer a better understanding of growth patterns in treatment-naïve SMA patients.
• These data can inform clinical management strategies for SMA.
• The findings are crucial for assessing the impact of current and future therapies on patient growth.