Assessing Bulbar Function in Spinal Muscular Atrophy Using Patient-Reported Outcomes

Area of Science:

• Neurology
• Genetics
• Clinical Medicine

Background:

• Novel Spinal Muscular Atrophy (SMA) treatments show motor improvements.
• Bulbar function monitoring is crucial for severe SMA, yet comparable measures are lacking.
• Bulbar dysfunction significantly impacts quality of life in SMA patients.

Purpose of the Study:

• To evaluate bulbar function using patient-reported outcomes (PROs) in individuals with SMA.
• To correlate PROs with clinical characteristics in the SMA population.
• To establish the utility of PROs for assessing bulbar deficits in SMA.

Main Methods:

• Recruited 47 non-ambulatory participants with SMA (mean age 29.8 years).
• Collected Voice Handicap Index (VHI) and Eating Assessment Tool-10 (EAT-10) PROs.
• Assessed associations using Spearman correlations and Wilcoxon rank sum tests.

Main Results:

• 94% reported voice issues (e.g., difficulty being heard in noise).
• 85.1% reported swallowing difficulties (e.g., with pills and solids).
• VHI and EAT-10 showed moderate association (rs=0.66).

Conclusions:

• Individuals with SMA experience significant bulbar deficits affecting voice and swallowing.
• PROs like VHI and EAT-10 are valuable for assessing bulbar function in SMA.
• Further research is needed to refine bulbar scales and their responsiveness to SMA treatments.