Physical functioning and mortality in very old patients on dialysis

Area of Science:

• Nephrology
• Geriatrics
• Public Health

Background:

• End-stage kidney disease (ESKD) affects a growing elderly population on dialysis.
• Quality of life (QoL) is often poor in ESKD patients.
• The link between QoL and mortality in elderly dialysis patients remains understudied.

Purpose of the Study:

• To investigate the relationship between QoL and mortality in elderly patients undergoing chronic dialysis.
• To identify specific QoL components that predict survival in this demographic.

Main Methods:

• A multicenter, prospective cohort study included 253 patients aged 75 years or older on chronic dialysis.
• Quality of Life was assessed using the Rand-QoL Short Form 36 (SF36) questionnaire.
• Prognostic power was evaluated using C-statistics and multivariate statistical models.

Main Results:

• Physical function and general health components of the SF36 independently predicted survival (P ≤ 0.01).
• Physical functioning demonstrated the highest explanatory power (+5.7%) and discriminant power (4.5% increase in Harrell's C Index) for mortality.
• Physical functioning significantly improved risk reclassification (20%) and model calibration (83%).

Conclusions:

• The physical function component of the SF36 is the most potent QoL predictor of mortality in very old dialysis patients.
• Physical functioning's predictive ability is clinically relevant for refining prognosis.
• This finding supports the use of physical functioning assessments to inform exercise programs for this population.