Table 2.
Treatment characteristics, carotid imaging, and cerebrovascular events (n=366).
| n | (%) | n | (%) | ||
|---|---|---|---|---|---|
| Radiation technique | # Carotid imaging studies | ||||
| IMRT | 334 | 92 | 1 | 185 | 50 |
| 2D | 16 | 4 | 2 | 99 | 27 |
| 3D | 16 | 4 | 3 | 35 | 9 |
| Radiation Schedule | 4 | 21 | 6 | ||
| Conventional Fractionation | 268 | 73 | 5 | 11 | 3 |
| Accelerated Hyperfractionation | 56 | 15 | 6 | 6 | 2 |
| Accelerated Fractionation | 27 | 7 | 7 | 2 | 1 |
| Hypofractionation | 15 | 4 | ≥8 | 7 | 2 |
| RT sidedness | Carotid Imaging Modality | ||||
| Bilateral | 282 | 77 | US | 698 | 95 |
| Unilateral | 84 | 23 | CTA | 22 | 3 |
| Chemotherapy | MRA | 6 | 1 | ||
| None | 90 | 25 | Arteriogram | 6 | 1 |
| Cisplatin | 258 | 70 | Other | 1 | 0 |
| Other agents | 92 | 25 | Cerebrovascular Events | ||
| Neck dissection | Carotid artery stenosis | 58 | 16 | ||
| None | 255 | 70 | Stroke | 18 | 5 |
| Bilateral | 96 | 26 | TIA | 13 | 4 |
| Ipsilateral | 15 | 4 |
Abbreviations: IMRT, intensity modulated radiation therapy; US, ultrasound; CTA, computed tomography angiography; MRA, magnetic resonance angiography; TIA, transient ischemic attack.