We examined the prevalence of vitamin D deficiency in hemodialysis patients and tested the hypothesis that decreased levels of 25-hydroxyvitamin D (25D) are associated with an increased risk for early all-cause mortality. One hundred and two patients, 57 (56%) men and 45 (44%) women, mean age 60.5 +/- 13.1 years, were included in our study. Serum calcium and phosphorus levels were measured by routine laboratory methods. Parathyroid hormone (PTH) was measured by immunoassay and 25D by enzyme immunoassay. Patients were divided into two groups depending on the serum concentration of 25D: below or above 50 nmol/L. Survival rates were analyzed using the Kaplan-Meier survival curves. The Cox regression model was used to define potential variables effecting all-cause mortality. The mean level of 25D in all patients was 58 +/- 35.6 nmol/L, 52% of patients had 25D levels >50 nmol/L and 48% had levels of 10.5-50 nmol/L. Compared with men, women were more likely to be 25D deficient (67% vs. 37%; P = 0.005). Patients were observed from the date of laboratory measurement until their death or to a maximum of 730 days. Kaplan-Meier survival analysis showed that mortality in patients was significantly higher in the group with 25D levels < or =50 nmol/L (P < 0.033). With Cox multivariable regression modeling, the PTH level (P < 0.029) turned out to be the only predictor of mortality in our patients. Using the definitions recommended in the National Kidney Foundation Kidney Disease Outcomes Quality Initiative guidelines, we found that our hemodialysis patients on average have vitamin D insufficiency. Our results indicate that patients with 25D levels < or =50 nmol/L are associated with higher all-cause early mortality.

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Results of our study show that SEVR is independently associated with hemoglobin in nondialysis CKD patients. CKD patients with lower hemoglobin have lower SEVR.
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Introduction: We aimed to compare prospectively the effect of high‐flux hemodialysis and post‐dilution hemodiafiltration on platelets. Methods: Twenty‐two hemodialysis patients were treated with one high‐flux hemodialysis and one post‐dilution hemodiafiltration procedure. PFA‐100 closure times (collagen/epinephrine—CEPI and collagen/adenosine diphosphate—CADP) were measured before and after the procedure, as well as platelet count, hemoglobin, hematocrit, and red blood cell count. All pre‐dialysis and post‐dialysis samples were taken from the afferent line. Findings: The platelet count after vs. before hemodialysis did not change significantly (229.3 ± 55.0 x109/L vs. 233.6 ± 55.8 × 109/L; P = 0.269), but was significantly lower after post‐dilution hemodiafiltration (215.5 ± 51.7 × 109/L vs. 245.3 ± 59.9 × 109/L; P < 0.0001). CEPI after vs. before hemodialysis was not significantly prolonged (192.9 ± 60.8 s vs. 173.4 ± 52.5 s; P = 0.147), and the same applied to CADP (143.6 ± 40.3 s vs. 142.6 ± 38.4 s; P = 0.897). CEPI after vs. before post‐dilution hemodiafiltration was significantly prolonged (268.3 ± 41.3 s vs. 176.4 ± 54.0 s; P < 0.0001) as was CADP (221.0 ± 53.9 s vs.133.9 ± 31.1 s; P < 0.0001). Discussion: Only after post‐dilution hemodiafiltration, we found a lower platelet count and prolonged platelet closure times.

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