Causes of death among patients with multiple sclerosis

Abstract

Background: Several studies show a high mortality risk among patients with multiple sclerosis (MS). Objectives: In this study, mortality and underlying causes of death were analysed among patients with MS diagnosed between 1964—1993 in Finland ( n = 1595). Methods: Standardized mortality ratios (SMRs) were calculated for both genders. The follow-up was based on linkage to the national computerized Cause-of-Death Register of Statistics Finland. Results: Altogether, 464 deaths were recorded by the end of 2006. The SMR as compared with the general population among females was 3.4 (95% confidence interval 3.0—3.9) and among males 2.2 (1.9—2.6). In total, 270 patients (58%) died from MS; only one of these deaths occurred during the first 2 years after the MS diagnosis. Mortality was also increased for other natural causes of death ( n = 160) in patients followed for more than 10 years (SMR 1.4, 1.2—1.7), with a significant increase in deaths from influenza (29, 6.0—85), pneumonia (4.7, 2.5—8.0) and gastrointestinal causes (4.4, 2.3—7.7). The SMR for violent causes was 1.2 (0.7—1.9) and for alcohol-related deaths 0.2 (0.02—0.7). The SMR for suicides was 1.7 (0.9—2.7). Conclusions: The MS population has an increased disease mortality, while the increase in the risk of accidents and suicides is not significantly increased among patients with MS in Finland.