SO072INCIDENCE OF FRACTURES BEFORE AND AFTER DIALYSIS INITIATION AMONG INCIDENT DIALYSIS PATIENTS

Abstract

Abstract Background and Aims The incidence of fractures is markedly higher in dialysis patients than in pre-dialysis patients, but it is not clear to what extent the initiation of dialysis as such is associated with accelerated fracture incidence or if fracture rates are already increasing prior to dialysis start among incident dialysis patients. Here we investigated the temporal pattern of occurrence of a first major osteoporotic fracture (MOF) among incident dialysis patients in the pre-dialysis period and in the period following dialysis initiation. Method We analyzed data from Swedish Renal Registry (SRR) and identified 9041 incident dialysis patients (2005 -2015; age 67 years, 67% men). We identified all first MOF (MOFfirst) in hip, spine, humerus and forearm during 12 months before and after dialysis initiation. Using flexible parametric hazard models and Fine-Gray analysis accounting for competing risk of death and renal transplantation, we estimated adjusted fracture incidence rates and predictors of MOFfirst. Results During the whole follow-up period, there were 361 fractures including 196 hip fractures. The crude incidence rate of MOFfirst (n=157) before dialysis initiation was 17/1000 patient-years and after initiation of dialysis the incidence rate of MOFfirst increased to 24/1000 patient-years. Overall the adjusted MOFfirst incidence rates increased from 6 months before initiation of dialysis, fluctuated, and stabilized at a higher rate than that of the baseline rate after 12 months. The adjusted hip fracture rate rose steeply 3 months before dialysis initiation, declined 3 months after dialysis initiation, fluctuated, and then became stabilized. On the contrary, the adjusted incidence rates of other fractures, i.e., non-hip fractures, appeared to be stable all the time, before as well as after initiation of dialysis. Female gender, higher age and previous history of MOF had a negative impact on fracture incidence rates before and after dialysis initiation. Conclusion We conclude that the incidence of MOFfirst is increasing already from 6 months prior to dialysis initiation among incident dialysis patients, and that there is a further increase following dialysis initiation. For hip fracture, which was the most common MOF, the temporal pattern of incidence rates was compressed to a high risk period lasting from 3 months before to 3 months after dialysis initiation, underlining the need of increased attention to prevent hip fractures in incident dialysis patients during this critical period.