Decreased mobility after starting dialysis is an independent risk factor for short-term mortality after initiation of dialysis

Impaired mobility at the onset of dialysis is considered one of the most important risk factors for short-term mortality after initiation of dialysis in elderly patients. However, whether a decline in mobility after starting dialysis also affects mortality is unclear.A total of 202 patients (age,75 years; mean, 80.4 ± 4.3) were enrolled in this retrospective cohort study in Yokosuka, Japan. They were divided into three subgroups by mobility: independent mobility at onset of dialysis and preservation of mobility after starting dialysis (group 1, n = 104); independent mobility at onset of dialysis and decline in mobility after starting dialysis (group 2, n = 48); and impaired mobility at onset of dialysis (group 3, n = 50). They were followed for 6 months after starting dialysis. A Cox proportional hazards model was used to evaluate the association between mobility and mortality.A total of 24.8% of patients had impaired mobility at the start of dialysis, and 68.9% declined in mobility after starting dialysis. In multivariate Cox proportional hazards analysis, the adjusted hazard ratios of groups 2 and 3 compared with group 1 were 3.80 (95% confidence interval, 1.02-14.10) and 4.94 (95% confidence interval, 1.42-17.10), respectively.Not only impaired mobility at the start of dialysis but also a decline in mobility after starting dialysis is associated with short-term mortality after initiation of dialysis.