Effects of Lowering Dialysate Sodium on Carotid Artery Atherosclerosis and Endothelial Dysfunction in Maintenance Hemodialysis Patients

Abstract

Purpose Our aim in this study was to examine the effects of low-sodium dialysate on carotid artery atherosclerosis, endothelial dysfunction, and blood pressure (BP) in maintenance hemodialysis (HD) patients. Methods After baseline measurements were obtained, the dialysate sodium concentration was reduced from 140 to 137 mEq/L. Carotid artery intima-media thickness (CIMT) and flow-mediated dilatation (FMD %) were measured before and after 6 months of HD with low-sodium dialysate. Interdialytic weight gain (IDWG), pre- and post-dialysis BP, and dialysis-related symptoms were monitored during the study. Results Fifty-two patients were enrolled, and 41 patients completed the study. Twenty-one patients had hypertension and were receiving antihypertensive medications. The average number of antihypertensive drugs per patient was 1.9 +/- 0.8. There was no significant reduction in BP at the end of the study, but the average number of antihypertensive drugs was reduced to 1.2 +/- 0.4 (P < 0.001). There were significant improvements in CIMT (P = 0.003) and FMD (P < 0.001) with low-sodium HD. The IDWG decreased significantly during the low-sodium dialysate treatment (P < 0.001). However, hypotensive episodes and cramps were more frequent during the study period. Conclusions Our study demonstrated that the lowering of dialysate sodium concentration reduced CIMT, improved FMD, and provided better control of IDWG and BP, but increased the incidence of dialysis-related symptoms.