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A survival analysis of 155 cases of progressive muscular atrophy
Abstract:
We performed a survival analysis of 155 cases of progressive muscular atrophy (PMA). In about half the cases, hands were involved first, the lower limbs in 30% and the shoulder girdle in 23%. The lifetables of PMA, adjusted to the expected mortality, showed a survival rate of 61.3% and 56.4% at three and five years, respectively. The location of onset symptoms did not modify the life expectancy, whereas the age of the patients at the moment of first diagnosis had a great influence on the course of the disease. The patients were further subdivided in two groups on the basis of the diffusion of the neuromuscular damage at the moment of the diagnosis. The course of the patients with a localized disease was markedly better than that of subjects with widespread disease. Some hypotheses are made about the latter group of cases.
Insights
Survival analysis of 155 progressive muscular atrophy (PMA) cases reveals age at diagnosis and disease diffusion impact prognosis. Localized disease shows better outcomes than widespread, highlighting key factors for progressive muscular atrophy patient survival.
Area of Science:
- Neurology
- Clinical Medicine
- Epidemiology
Background:
- Progressive muscular atrophy (PMA) is a rare motor neuron disease.
- Understanding prognostic factors is crucial for patient management.
Purpose of the Study:
- To analyze survival rates in a cohort of 155 PMA patients.
- To identify factors influencing life expectancy in PMA.
Main Methods:
- Survival analysis using lifetables.
- Adjustment for expected mortality.
- Subgroup analysis based on disease diffusion at diagnosis.
Main Results:
- 3-year survival rate: 61.3%; 5-year survival rate: 56.4%.
- Age at diagnosis significantly influenced survival.
- Localized neuromuscular damage at diagnosis correlated with better prognosis compared to widespread disease.
- Symptom onset location did not significantly alter life expectancy.
Conclusions:
- Age at diagnosis and extent of disease diffusion are critical prognostic indicators in PMA.
- Early diagnosis and localized disease suggest a more favorable outcome.
- Further research is warranted for understanding and managing widespread PMA cases.