Spinal bracing and lung function in type-2 spinal muscular atrophy

Area of Science:

• Pediatric Pulmonology
• Neuromuscular Disorders
• Rehabilitation Medicine

Background:

• Type 2 spinal muscular atrophy (SMA) often presents with scoliosis, leading to respiratory muscle weakness and impaired lung function.
• Spinal braces, used to manage scoliosis, can potentially exacerbate respiratory issues and hinder effective coughing in SMA patients.

Purpose of the Study:

• To evaluate the time-dependent effects of a static-balanced brace on pulmonary function in children with type 2 SMA.
• To assess the impact of brace wear on lung function parameters and cough effectiveness.

Main Methods:

• A case series involving six children with type 2 SMA (ages 6-15) was conducted.
• Pulmonary function tests, including peak expiratory flow (PEF), peak cough flow (PCF), maximal static inspiratory pressure (MIP), maximal static expiratory pressure (MEP), and forced vital capacity (FVC), were performed.
• Measurements were taken upon awakening and after three hours of wearing a static-balanced brace.

Main Results:

• Peak expiratory flow (PEF), maximal static expiratory pressure (MEP), and forced vital capacity (FVC) were higher after three hours of brace wear compared to baseline.
• Peak cough flow (PCF) showed a slight increase, while maximal static inspiratory pressure (MIP) showed a slight decrease.
• The static-balanced brace did not negatively impact overall lung function in the studied cohort.

Conclusions:

• Static-balanced braces appear safe for pulmonary function in type 2 SMA patients with scoliosis.
• Bracing may support cough maneuvers, potentially aiding in airway clearance.
• A dual assessment approach (baseline and post-brace wear) is recommended for informed decisions regarding brace use.