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The Influence of Age on the Likelihood of Catheter-Free Fistula Use in Hemodialysis Patients

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The Influence of Age on the Likelihood of Catheter-Free Fistula Use in Hemodialysis Patients

Farah Ladak et al. Can J Kidney Health Dis.

Abstract

Background: Clinical practice guidelines recommend arteriovenous fistulas as the preferred form of vascular access for hemodialysis. However, some studies have suggested that older age is associated with poorer fistula outcomes.

Objective: We assessed the impact of age on the outcomes of fistula creation and access-related procedures.

Design: This was a prospective cohort study using data collected as part of the Dialysis Measurement Analysis and Reporting (DMAR) system.

Setting: Participating Canadian dialysis programs, including Southern Alberta Renal Program, Manitoba Renal Program, Sunnybrook Health Sciences Centre (Toronto, Ontario), London Health Sciences Centre (London, Ontario), and The Ottawa Hospital (Ottawa, Ontario).

Patients: Incident hemodialysis patients aged 18 years and older who started dialysis between January 1, 2004, and May 31, 2012.

Measurements: The primary outcome was the proportion of all first fistula attempts that resulted in catheter-free fistula use, defined as independent use of a fistula for hemodialysis (ie, no catheter in place). Secondary outcomes included the time to catheter-free fistula use among patients with a fistula creation attempt, total number of days of catheter-free fistula use, and the proportion of a patient's hemodialysis career spent with an independently functioning fistula (ie, catheter-free fistula use).

Methods: We compared patient characteristics by age group, using t tests or Wilcoxon rank sum tests, and chi-square or Fisher exact tests, as appropriate. Logistic and fractional logistic regression were used to estimate the odds of achieving catheter-free fistula use by age group and the proportion of dialysis time spent catheter-free, respectively.

Results: A total of 1091 patients met our inclusion criteria (567 age ≥ 65; 524 age < 65). Only 57% of first fistula attempts resulted in catheter-free fistula use irrespective of age (adjusted odds ratio [OR]≥65vs<65: 1.01; P = .93). The median time from hemodialysis start to catheter-free use of the first fistula did not differ by age when grouped into fistulas attempted pre- and post-dialysis initiation. The adjusted rates of access-related procedures were comparable (incidence rate ratio [IRR]≥65vs<65: 0.95; P = .32). The median percentage of follow-up time spent catheter-free was similar and low in patients who attempted fistulas (<65 years: 19% vs ≥65 years: 21%; P = .85).

Limitations: The relatively short follow-up time may have underestimated the benefits of fistula creation and the observational study design precludes inferences about causality.

Conclusions: In our study, older patients who underwent a fistula attempt were just as likely as younger patients to achieve catheter-free fistula use, within a similar time frame, and while requiring a similar number of access procedures. However, the minority of dialysis time was spent catheter-free.

Keywords: arteriovenous fistula; central venous catheter; chronic kidney disease; hemodialysis.

Conflict of interest statement

Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Figures

Figure 1.
Figure 1.
Cohort creation. Note. PD = peritoneal dialysis; AVG = arteriovenous grafts.
Figure 2.
Figure 2.
Time to catheter-free use of first fistula (months), among those who achieved it. Note. Analysis is restricted to patients who eventually achieved catheter-free use. Left panel is for predialysis fistula attempts with follow-up starting from dialysis initiation. Right panel is for postdialysis attempts with follow-up starting from creation date. Solid line represents individuals under age 65 years; dotted line represents individuals 65 years of age, and older.
Figure 3.
Figure 3.
The proportion of time spent catheter-free in patients attempting a fistula creation. Note. The distribution of the proportion of time spent catheter-free was bi-modal in appearance. In both age groups, 21% used their fistula catheter-free for the entire duration of follow-up. However, a total of 34% in those <65 never used their fistula catheter-free compared with 38% of those ≥65 years.

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