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Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Ren+Nutr 2015 ; 25 (5): 433-9 Nephropedia Template TP
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Self-motivation is associated with phosphorus control in End-Stage Renal Disease #MMPMID25912398
Umeukeje EM; Merighi JR; Browne T; Carlsson JN; Umanath K; Lewis JB; Ikizler TA; Wallston KA; Cavanaugh K
J Ren Nutr 2015[Sep]; 25 (5): 433-9 PMID25912398show ga
Objective: Hyperphosphatemia is common in end-stage renal disease (ESRD), and associates with mortality. Phosphate binders reduce serum phosphorus; however, adherence is often poor. This pilot study aims to assess patients? self-motivation to adhere to phosphate binders, its association with phosphorus control, and potential differences by race. Design: Cross-sectional Participants and measurements: Subjects were enrolled from one academic medical center dialysis practice from July?November 2012. Self-motivation to adhere to phosphate binders was assessed with the Autonomous Regulation (AR) scale (range: 1?7), and self-reported medication adherence with the Morisky Medication Adherence Scale (MMAS). Linear regression models adjusting for age, gender, health literacy and medication adherence were applied to determine associations with serum phosphorus level, including any evidence of interaction by race. Results: Among 100 participants, mean age was 51 years (± 15), 53% were male, 72% were non-white, 89% received hemodialysis, and mean serum phosphorus level was 5.7 [±1.6] mg/dL. More than half (57%) reported the maximum AR score (7). Higher AR scores were noted in those reporting better health overall (p=0.001) and those with higher health literacy (p=0.01). AR score correlated with better medication adherence (r=0.22; p=0.02), and medication adherence was negatively associated with serum phosphorus (r= ?0.40; p<0.001). In sub-group analysis among non-whites, higher AR scores correlated with lower serum phosphorus (High vs. Lower AR Score: 5.55 (1.5) vs. 6.96 (2.2); p=0.01). Associations between AR score (? 95% CI: ?0.37 (?0.73 ? ?0.01); p=0.04), medication adherence (? 95% CI: ?0.25 (?0.42 ? ?0.07); p=0.01) and serum phosphorus, persisted in adjusted analyses. Conclusions: Self-motivation was associated with phosphate binder adherence and phosphorus control, and this differed by race. Additional research is needed to determine if personalized, culturally sensitive strategies to understand and overcome motivational barriers may optimize mineral bone health in ESRD.