Association between post-dialysis hemoglobin level and the survival of vascular access.

INTRODUCTION: Although a few dialysis facilities conduct a complete blood cell count for some patients at post-dialysis, including hemoglobin, clinical findings supporting the interpretation of results are scarce. The aim of this study was to investigate the association between post-dialysis hemoglobin level and vascular access failure with clinical data.

METHODS: Study design: Case crossover design.

SETTING: Japanese dialysis facilities, which routinely take post-dialysis blood samples, including complete blood cell counts at least once a month.

PARTICIPANTS: Hemodialysis patients who experienced vascular access failure in January 2010 until December 2014.

EXPOSURE: Post-dialysis hemoglobin level.

MAIN OUTCOME: Vascular access failure treated with endovascular treatment or operation.

STATISTICAL ANALYSIS: Self-matched odds ratios and 95% confidence intervals were estimated by comparing post-dialysis hemoglobin just before events ("case") with levels at 6 and 12 months before events ("control") using conditional logistic regression, and presented with restricted cubic spline.

RESULTS: Two hundred and thirty hemodialysis patients with vascular access failure were identified. Mean post-dialysis hemoglobin level before the failure was 11.8 g/dL (standard deviation 1.7). The spline curve showed that higher post-dialysis hemoglobin levels above 11.8 g/dL had a greater odds ratio for vascular access failure. Post-dialysis hemoglobin levels and odds ratios (95% confidence interval) for vascular access failure relative to the reference value (Hb 11.8 g/dL) were Hb 12.0 g/dL, 1.1 (1.0-1.1); Hb 14.0 g/dL, 1.4 (1.0-2.0); and Hb 16.0 g/dL, 2.1 (1.1-4.3).

CONCLUSIONS: A higher post-dialysis hemoglobin level was associated with vascular access failure. Higher post-dialysis Hb could be a factor that triggers vascular access failure.