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Body mass index change and hospitalization risk in elderly hemodialysis patients: Results from Japanese Dialysis Outcomes and Practice Patterns Study

American Journal of Nephrology Jan 27, 2018

Sumida K, et al. - The association between body mass index changes and risk of subsequent hospitalization in patients undergoing hemodialysis (HD), was investigated. Among elderly HD patients, body mass index (BMI) decreases over a relatively short-term period were found to be independently associated with higher risk of subsequent hospitalization, especially cardiovascular-related hospitalization.

Methods
  • This study was performed in a prospective cohort of 1,804 HD patients aged ≥65 years enrolled in the Japanese Dialysis Outcomes and Practice Patterns Study phases 3 (2005–2008) and 4 (2009–2011).
  • Using Cox models with adjustment for potential confounders, researchers assessed the links between changes in body mass index (BMI) over a 4-month baseline period (<–3%, –3 to <–1%, –1 to <1% [reference], 1 to <3%, and ≥3%) and subsequent risk of all-cause, cardiovascular, and noncardiovascular hospitalization.

Results
  • A total of 1,028 incident hospitalizations were reported for any cause, including 275 and 753 hospitalizations for cardiovascular and noncardiovascular causes, respectively, during a median follow-up of 1.2 years.
  • Researchers found an L-shaped link between BMI change and all-cause hospitalization.
  • Findings revealed that the multivariable-adjusted hazard ratios (HRs; 95% CI) of all-cause hospitalization associated with BMI changes of <–3%, –3 to <–1%, 1 to <3%, and ≥3% (vs. –1 to <1%) were 1.29 (1.01–1.65), 1.22 (0.98–1.51), 1.04 (0.83–1.29), and 1.10 (0.83–1.45), respectively.
  • They also noted that qualitatively similar links were present for cardiovascular-related hospitalization (corresponding HRs [95% CI]: 1.58 [1.06–2.37], 1.09 [0.75–1.58], 0.99 [0.72–1.36], and 0.91 [0.51–1.64], respectively) but not for noncardiovascular-related hospitalization (corresponding HRs [95% CI]: 1.19 [0.90–1.57], 1.26 [0.99–1.59], 1.06 [0.84–1.35], and 1.18 [0.86–1.63], respectively).
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