Summary of the results of visual flow pattern grading in patients with AVM (n = 18)
| SMG 1 (n = 4) | SMG 2 (n = 7) | SMG ≥3 (n = 7) | |
|---|---|---|---|
| Arterial feeders | |||
| No. of arteries | Single | Single and multiple (1–3) | Single and multiple (1–4) |
| Flow across arteries | Homogeneous | Heterogeneous n = 4 | Heterogeneous n = 3 |
| Velocity grading | 1.7 ± 0.6 | 1.4 ± 0.5 | 1.5 ± 0.6 |
| Range = 1–2 | Range = 1–2 | Range = 0–2 | |
| Median = 2 | Median = 1 | Median = 1 | |
| Venous drainage | |||
| No. of veins | Superficial only (1–2) | Superficial/deep (1–3) | Superficial/deep (1–3) |
| Flow across veins | Heterogeneous n = 2 | Heterogeneous n = 3 | Heterogeneous n = 4 |
| Velocity grading | 0.5 ± 0.6 | 0.8 ± 0.8 | 1.1 ± 0.6 |
| Range = 0–1 | Range = 0–2 | Range = 0–2 | |
| Median = 0.5 | Median = 1 | Median = 1 |