Table 2.
Study design and online Qa surveillance results expressed in thrombosis/patient-year
| Patient numbers | Thrombosis/patient-year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Overall (AVF and AVG) | AVF | AVG | ||||||||
| Author | Year | Study design | Control | Qa surveillance | Control | Qa surveillance | Control | Qa surveillance | Control | Qa surveillance |
| Houben [33] | 2003 | Prospective observational | 29 | 25 | 0.62 | 0.17 (P = 0.032) | – | – | – | – |
| Lok [34] | 2003 | Prospective sequential observational | 451 | Same as control | – | 0.12 | 0.1 (P = ns) | 0.52 | 0.35 (P = 0.034) | |
| McCarley [35] | 2001 | Prospective sequential observational | 132 | Same as control | – | – | 0.14/0.15a | 0.07 (P = ns/ P = ns) | 0.71/0.67a | 0.16 (P < 0.001/ P < 0.001) |
| Ram [36] | 2003 | Randomized controlled | 34/35a | 32 | – | – | – | – | 0.68/0.5a | 0.91 (P = unknown) |
| Sands [37] | 1999 | Randomized controlled | 40 | 63 | 1.25/0.303a | 0.059 (P < 0.01/ P < 0.05) | – | – | – | – |
| Schwab [38] | 2001 | Prospective observational, historic control | – | 42 | 0.25 | 0.16 (P < 0.05) | 0.16 | 0.07 (P < 0.05) | 0.3 | 0.22 (P = ns) |
| Shahin [39] | 2005 | Prospective observational, historic control | 146 | 76 | – | – | 0.26 | 0.21 (P = ns) | – | – |
| Wijnen [40] | 2006 | Retrospective | 119 | 117 | 0.63 | 0.25 (P = 0.000) | 0.21 | 0.09 (P = 0.022) | 1.14 | 0.45 (P = 0.000) |
AVF = arteriovenous fistula, AVG = arteriovenous graft, Qa = vascular access flow. aThree trials had two control groups: McCarley [35], no monitoring/dynamic venous pressure monitoring; Ram [36], clinical criteria/quarterly duplex ultrasound assessment; Sands [37], no monitoring/static venous pressure monitoring.