Table 3.
Duplex Doppler cut-off criteria of a significant AVG stenosis (used as the indication to angiography and intervention)—from the work by Malik et al. 28
| Trial first author | No of subjects US/control | Diameter reduction in B-mode | Peak velocity increase | Qa decrease | Qa cut-off value (mL/min) |
Residual diameter (mm) |
Prolonged=survival in ultrasound surveillance arm? |
|---|---|---|---|---|---|---|---|
| Mayer et al. 9 | 35/35 | >50% | – | – | – | – | Yes |
| Lumsden et al. 10 | 32/32 | >50% | – | – | – | – | No |
| Ram et al. 11 | 32/34 | >50% | – | – | – | – | No |
| Robbin et al. 29 | 65/61 | >50% | >2fold | <500 | <4.0 | No | |
| Malik et al. 13 | 97/92 | >50% | >2fold | >25% | <600 | <2.0 | Yes |
Qa = access flow volume.