Hemodialysis Session Duration, Ultrafiltration Rate, Interdialytic Weight Gain and their Association with Albumin in Patients on Intermittent Hemodialysis in a Regional Dialysis Unit: A Cross-sectional Study

Abstract

Aim Several studies suggest that a low pre-dialysis serum albumin level (<40g/L) is associated with increased mortality in dialysis patients. The objective of this study was to assess if hemodialysis session duration (HSD), ultrafiltration rate (UFR) and interdialytic weight gain percentage (IDWG%) are associated with pre-dialysis serum albumin levels (markers of all-cause mortality), thus influencing mortality.  Method  This is a cross-sectional analytical study in which data were collected from a regional cohort of 59 prevalent chronic hemodialysis patients using a national electronic database (eMED). Continuous data were analyzed using a regression model to assess for an association between HSD, IDWG% and UFR with albumin levels. Results Fifty-six patients were included in the study. Multiple linear regression models demonstrated a cross-sectional association between longer HSD and higher serum albumin levels and a statistically significant positive correlation (r = 0.353; p < 0.05). No significant association of UFR (p = 0.169) and IDWG% (p = 0.549) with albumin was observed. Mean albumin was 38.07 ± 3.96 g/L in the HSD <240 min group compared to 40.50 ± 2.83g/L in the HSD ≥240 min group which was statistically significant (p < 0.05). Conclusion Longer HSD has a cross-sectional association with higher pre-dialysis serum albumin with patients having HSD ≥240 min demonstrating the highest levels of serum albumin. Our study suggests longer HSD may improve mortality in the dialysis population.