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Spinal muscular atrophy: survival pattern and functional status
Brian H Y Chung1, Virginia C N Wong, Patrick Ip
1Division of Neurodevelopmental Paediatrics, Department of Paediatrics and Adolescent Medicine, University of Hong Kong, Hong Kong, China. vcnwong@hkucc.hku.hk.
Pediatrics
|October 20, 2004
Summary
Survival and functional status in children with Spinal Muscular Atrophy (SMA) have improved. Most SMA patients require assistance with mobility and self-care, highlighting the need for updated classification criteria.
Area of Science:
- Neurology
- Genetics
- Pediatrics
Background:
- Spinal Muscular Atrophy (SMA) is a common genetic neuromuscular disorder with variable clinical presentations.
- Traditional SMA classification lacks inclusion of best lifetime functional status, which is crucial given recent medical advances improving life expectancy and ambulatory capabilities.
Purpose of the Study:
- To assess the survival patterns of children with SMA.
- To evaluate the ambulatory and functional status of children diagnosed with SMA.
- To explore potential improvements in SMA classification based on functional outcomes.
Main Methods:
- Retrospective analysis of 83 SMA patients from a university-affiliated hospital and patient registry in Hong Kong.
- Utilized Kaplan-Meier method for survival and ambulation probability analysis.
- Functional status assessed using the Functional Independence Measure for Children (WeeFIM) in 39 patients, covering self-care, mobility, and cognition domains.
Main Results:
- Improved survival probabilities observed across SMA types compared to historical data.
- SMA Type I patients had 30% survival at 20 years; Type II had 92% survival at 20 years.
- Majority of SMA patients required assistance in self-care and mobility; stair management was a significant challenge. Cognitive function was relatively better preserved.
Conclusions:
- Significant improvements in survival rates for SMA patients underscore the impact of medical advancements.
- Functional assessments, particularly best-ever functional status, should be considered for refining SMA classification.
- Ongoing evaluation of functional independence in mobility and self-care is essential for patient management and care planning.