Comparison of Clinical Presentation and Outcomes of Peritonitis in the Elderly and Younger Peritoneal Dialysis Patients.

BACKGROUND

The incidence of elderly patients receiving peritoneal dialysis (PD) has increased. This study aimed to examine the clinical presentation and outcomes of peritonitis in elderly PD patients compared with younger PD patients.

METHODS

This single-center, retrospective, observational cohort study included all adult PD patients who developed peritonitis between January 2011 and December 2014. Elderly was defined as ≥ 65 years old at PD initiation. The primary outcome was medical cure, defined as a peritonitis episode cured by antibiotics without being complicated by catheter removal, transfer to hemodialysis (HD), relapsing peritonitis,or death. The secondary outcomes were clinical manifestations (fever, cloudy dialysate) and complications (catheter removal, transfer to HD, relapse, hospitalization, and mortality). Peritonitis outcomes were compared using multivariable logistic regression.

RESULTS

Overall, 377 peritonitis episodes occurred in 247 patients. Of these, 126 episodes occurred in 79 elderly patients and 251 episodes occurred in 168 younger patients. Baseline demographic data were comparable between the 2 groups, except that elderly patients were significantly more likely to have diabetes mellitus (66% vs 46%), diabetic nephropathy (55% vs 39%), and a lower serum albumin than younger patients. Medical cure was comparable between the 2 groups (71% vs 72%, respectively, = 0.67, adjusted odds ratio [AOR] 0.89, 95% confidence interval [CI]: 0.52 - 1.53). Compared with younger patients, elderly patients experiencing peritonitis had lower odds of fever (OR 0.53, 95% CI: 0.30 - 0.94), cloudy dialysate (OR 0.45, 95% CI: 0.23 - 0.88), and catheter removal (AOR 0.50, 95% CI: 0.26 - 0.98), but similar odds of transfer to HD (AOR 0.70, 95% CI: 0.32 - 1.51), relapse (AOR 1.57, 95% CI: 0.46 - 5.40), hospitalization (AOR 1.55, 95% CI: 0.52 - 4.56), and all-cause mortality (AOR 1.88, 95% CI: 0.83 - 4.26).

CONCLUSIONS

Compared with younger patients, elderly PD patients with peritonitis achieved similar medical cure rates, a lower catheter removal rate, and comparable rates of HD transfer, relapse, hospitalization, and death. Elderly PD patients experiencing peritonitis were less likely to present with fever or cloudy dialysate.