Raymond Hakim
Last active: 6/9/2014

Change in vascular access and mortality in maintenance hemodialysis patients.

Lacson E, Wang W, Lazarus JM, Hakim RM
Am J Kidney Dis. 2009 54 (5): 912-21

PMID: 19748717 · DOI:10.1053/j.ajkd.2009.07.008

BACKGROUND - We hypothesized that a change from central venous catheters to a fistula or graft would improve short-term mortality risk in maintenance hemodialysis patients.

DESIGN - Prospective observational study.

SETTING & PARTICIPANTS - All maintenance in-center hemodialysis patients treated in Fresenius Medical Care, North America legacy facilities alive on January 1, 2007 with baseline laboratory data from December 2006.

PREDICTOR - Access type (fistula, catheter, or graft), determined on December 31, 2006, and monthly thereafter. Conversion from a catheter to a fistula or graft during the 4-month period from January 1 to April 30, 2007.

OUTCOME - Mortality was tracked from May 1, 2007, to December 31, 2007. Standard and time-dependent Cox models were used to determine hazard risks (HRs) of death with and without adjustment for case-mix and laboratory values.

RESULTS - At baseline, 79,545 patients had 43% fistulas, 29% catheters, and 27% grafts. Mean age was 62 +/- 15 years, 54% were men, 51% were white, and 53% had diabetes. Compared with fistulas, unadjusted HRs of death were higher for grafts (1.22) and catheters (1.76; P < 0.001). In adjusted models, overall risk for grafts was decreased to 1.05 (95% limits, 1.003-1.100; P < 0.05) and approached that for fistulas consistently across multiple strata. Compared with patients who continued using a catheter, those who converted to either a graft or fistula had an HR of 0.69, whereas those who converted from a graft or fistula to a catheter had increased HRs to 2.12 (both P < 0.001). Similar trends were observed in the subset of incident patients (vintage < 90 days at study onset).

LIMITATIONS - Observational design with residual confounding from unmeasured patient, facility, and treatment-related factors.

CONCLUSIONS - Catheters have the worst associated mortality risk. Changing from a catheter to a fistula or graft is associated with significantly improved survival. The risk for grafts approached that of fistulas, providing an alternative to prolonged catheter exposure and potentially less hazardous "bridge" toward a fistula.

MeSH Terms (11)

Adult Aged Arteriovenous Shunt, Surgical Catheterization, Central Venous Catheters, Indwelling Female Humans Male Middle Aged Prospective Studies Renal Dialysis

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