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J Am Soc Nephrol 15:204-209, 2004
© 2004 American Society of Nephrology

CLINICAL SCIENCE

Cardiovascular Comorbidity and Late Referral Impact Arteriovenous Fistula Survival: A Prospective Multicenter Study

Pietro Ravani*, Giuliano Brunori{dagger}, Salvatore Mandolfo{ddagger}, Giovanni Cancarini{dagger}, Enrico Imbasciati{ddagger}, Daniele Marcelli§ and Fabio Malberti*

*Divisione di Nefrologia e Dialisi, Cremona, Italy; {dagger}Cattedra di Nefrologia Università di Brescia, Brescia, Italy; {ddagger}Divisione di Nefrologia e Dialisi, Lodi, Italy; and §Fresenius Medical Care, Bad Homburg, Germany.

Correspondence to Dr. Pietro Ravani, Section of Nephrology, Cremona Hospital, 1, Largo Priori, 26100 Cremona, Italy. Phone: +39-0372-405389; Fax: +39-0372-405382;

ABSTRACT. Autologous arteriovenous fistulas (AVF) have the best 5-yr patency and the lowest complication rate among hemodialysis vascular accesses. However, maturation requirements to optimize survival are unknown. A longitudinal cohort study was conducted to ascertain risk factors for failure, maturation time, and survival of the first AVF. All patients who initiated hemodialysis between January 1, 1997, and December 31, 2002, in three centers were included in this study. Analysis was restricted to patients who received an AVF. Cox regression was used to estimate the association between predictors of interest and primary and secondary AVF survival. Of the 535 patients enrolled (mean age, 66.5 yr; 57.8% male; 26.7% diabetic), 513 (96%) received an AVF. Patients who initiated with catheters (47%) cannulated their AVF earlier (median maturation period, 0.78 versus 1.80 mo; P < 0.001). Median primary and secondary survivals were longer than 50 and 72 mo, respectively. After adjustment for confounding factors, cardiovascular disease (hazard ratio [HR], 1.84; 95% confidence interval [CI], 1.26 to 2.67), utilization earlier than 1 mo after placement (HR, 1.94; 95% CI, 1.34 to 2.82), and referral within 3 mo of dialysis start (HR, 1.55; 95% CI, 1.04 to 2.32) were associated with a reduction in primary AVF survival. Presence of cardiovascular disease (HR, 2.21; 95% CI, 1.38 to 3.55), maturation time <15 d (HR, 2.12; 95% CI, 1.20 to 3.73), and presence of catheters at hemodialysis initiation (HR, 1.79; 95% CI, 1.13 to 2.84) were associated with lower secondary AVF survival. It is concluded that cardiovascular disease, late referral, temporary catheters, and early cannulation are associated with impaired AVF survival. It is recommended that AVF be allowed to mature at least 1 mo before cannulation. E-mail: p.ravani@libero.it




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