Trajectory of change in the swallowing status in spinal muscular atrophy type I

Area of Science:

• Pediatric Neurology
• Developmental Pediatrics
• Clinical Nutrition

Background:

• Spinal muscular atrophy (SMA) type I is a severe genetic neuromuscular disorder.
• Swallowing dysfunction is a common and progressive complication in SMA type I.
• Understanding the natural history of swallowing changes is crucial for timely intervention.

Purpose of the Study:

• To investigate the progression of swallowing dysfunction from birth to 2 years in infants with SMA type I.
• To offer clinical insights for managing feeding difficulties in this population.

Main Methods:

• Retrospective review of 11 patients diagnosed with SMA type I.
• Utilized the Neuromuscular Disease Swallowing Status Scale (NdSSS) for functional assessment.
• Employed videofluoroscopic swallowing studies (VFSS) to evaluate aspiration risk.

Main Results:

• Swallowing function decline was noted around 6 months of age in most SMA type I patients.
• Median age for initiating tube feeding was 6 months (IQR, 3-7 months).
• Significant variability observed in the transition from oral to tube feeding (5-12 months); aspiration occurred even during oral feeding in some.

Conclusions:

• The onset and progression of swallowing impairment in SMA type I are highly variable.
• An individualized management strategy is essential for optimizing nutritional support and airway protection.
• Early VFSS may detect aspiration even in the initial stages of the disease.