Predictors and prognostic significance of persistent fluid overload: A longitudinal study in Chinese peritoneal dialysis patients. Issue 3 (May 2023)

• Record Type: Journal Article
• Authors: Ng, Jack Kit-Chung; Kwan, Bonnie Ching-Ha; Chan, Gordon Chun-Kau; Chow, Kai Ming; Pang, Wing Fai; Cheng, Phyllis Mei-Shan; Leung, Chi Bon; Li, Philip Kam-Tao; Szeto, Cheuk Chun
• Is Part Of: Peritoneal dialysis international. Volume 43:Issue 3(2023)
• Page Start: 252
• Page End: 262
• Publication Date: 2023-05
• Subjects: Bioimpedance -- fluid overload -- mortality -- peritoneal dialysis -- variability of volume status; Peritoneal dialysis -- Periodicals; Continuous ambulatory peritoneal dialysis -- Periodicals; 617.461059
• DOI: 10.1177/08968608221110491
• Languages: English
• ISSNs: 0896-8608

Abstract

Background: Cross-sectional studies showed that fluid overload (FO) measured by bioimpedance spectroscopy (BIS) predicted adverse outcomes in patients on peritoneal dialysis (PD). We aimed to describe the longitudinal change in volume status in Chinese PD patients and determine its relation with clinical outcomes. Methods: We performed a single-centre, retrospective analysis of all PD patients who underwent repeated BIS from 2010 to 2015. FO was defined by relative hydration index (RHI; volume of overhydration adjusted by extracellular water >7%). Variability of volume status (VVS) was denoted by the standard deviation of all RHI. The association of time-averaged RHI and VVS on patient and technique survival was explored by a competing risk model. Results: A total of 269 patients were followed for a median of 47.1 months. Mean time-averaged RHI was 17.6 ± 10.2%. Multivariable mixed linear regression revealed that RHI was significantly associated with diabetes, time-varying systolic blood pressure, and inversely with time-varying albumin level, lean tissue index and fat tissue index ( p <0.0001 for all). Time-averaged RHI independently predicted patient survival (subdistribution hazard ratio (SHR) 1.05, 95% CI 1.03–1.07, p <0.0001) and technique survival (SHR 1.04, 95% CI 1.02–1.06, p <0.0001), whereas VVS did not. The mortality risk for patients with persistent FO was consistently higher than the corresponding risk estimated from baseline FO of the same extent. Conclusions: Persistent FO was a strong predictor of patient and technique failure. Repeated bioimpedance measurements to monitor volume status may provide additional prognostic information in PD patients. Graphical Abstract This is a visual representation of the abstract.