The provision of adequate hemodialysis is dependent on repeated and reliable access to the central circulation. This access to the circulation is best provided by primary arteriovenous fistulas (AVF) and to a lesser extent by AV grafts (AVG). AVF have the lowest rates of infection and thrombosis and are therefore the access of choice whenever vascular anatomy allows (1,2). On the other hand, establishing primary AVF in an ever-aging end-stage renal disease (ESRD) patient population with a high prevalence of diabetes and vascular disease has proved a daunting task, at least in the United States. Late referrals to nephrologists make establishment of AVF more difficult. Therefore, our reliance on less desirable modes of vascular access such as synthetic (PTFE) grafts and tunneled, cuffed catheters (CVC) has increased. In fact, up to 60% of new patients and 30% of prevalent patients are using a catheter for dialysis access (3). These latter two accesses are more prone to both thrombosis and infection. Venous access in particular has emerged as a substantial cause of hemodialysis morbidity and mortality. Two articles in this issue of JASN deal with these dilemmas (4,5).Catheter-related bacteremia remains the most common and potentially serious complication of long-term venous access (6 -8). Initial reports of tunneled, cuffed catheters reported low rates of bacteremia, but these were maintained in patients for a relatively short duration. In our original description, for example, median catheter use was only 8 wk, ranging from 3 wk to 5.4 mo (9). In this early report, only one episode of bacteremia occurred in 80 dual lumen catheters. Two more recent studies each showed bacteremia to occur about once every 200 to 250 catheter-days. In the first study, Marr et al. (10) followed 102 patients with CVC for total of 16,081 catheter-days. Bacteremia occurred in this study at a rate of 3.9/1000 catheter-days. Similar to Marr's data, Saad described a mean bacteremia rate of 5.5/1000 catheter-days (11).In our experience, metastatic complications, such as vertebral osteomyelitis, septic arthritis, and endocarditis, have only rarely been seen among our patients in the absence of indwelling catheters. Kovalik et al. (12) demonstrated a significant increase in vertebral osteomyelitis and epidural abscess in patients with dialysis catheters versus AVG. Likewise, Robinson et al. (13) showed that endocarditis occurred at a much higher rate in patients with catheters and was relatively rare in patients using synthetic grafts or AVF. Hence, dialysis with a catheter not only increases the rate of bacteremia but also appears to increase the rate of complications from an individual episode of bacteremia.Furthermore, frequent problems maintaining catheter blood flow in CVC reduce dialysis efficiency and delivered Kt/V. Repeated studies have shown consistently lower delivered dialysis dose with catheters when compared with either grafts or fistulas. For instance, Sehgal et al. (14) demonstrated Kt/V of 1.37 and 1.31 with AVG and AVF, re...