Impact of demographic factors, comorbidities, and comedication on progression and survival in a large Chinese ALS cohort

Objective: To clarify the impact of specific risk/protective factors on the disease progression and survival in a large population of Chinese sporadic ALS (sALS) patients.
Methods: We investigated a cohort of 937 sALS patients prospectively. Uni- and multivariate regression analysis were performed to analyze the influence of demographic factors, comorbidities and medication on the progression and survival of ALS.
Results: Our results showed younger age of onset (p<0.05), long diagnostic delay (p<0.001) and intake of riluzole (p<0.001) were significantly related to low progression rate and long survival time. History of smoking (p<0.05) and bulbar onset (p<0.001) were risk factors for rapid progression and poor prognosis. Baseline ALSFRS-R score (p<0.001) and total MRC score (p<0.05) were positively related to mean survival time of included patients. Neither comorbidities nor intake of antihypertensive drugs, antidiabetics, and statins as dependent variables showed considerable influence on ALS progression or survival.
Conclusion: Our study revealed early onset and long diagnostic delay were indicators of slow progression and long survival. Smoking and bulbar onset were risk factors for shorter survival times and abstaining from smoking was beneficial to patients with ALS in improving median survival time. Long-term intake of riluzole should be recommended for affordable patients.