Reasons for failure to complete comparative study of assessment of carotid stenosis in 73 consecutive patients with severe carotid stenosis
| DSA | CT angiography | MR angiography | |
|---|---|---|---|
| *One patient required transfusion owing to blood loss. | |||
| CT, computed tomography; DSA, digital subtraction angiography; MR, magnetic resonance. | |||
| Total | 73 | 73 | 73 |
| No room on waiting list | 0 | 5 | 14 |
| Not done (fault lay with procedure) | 4/73 (5%) | 2/68 (3%) | 6/59 (10%) |
| 1 previous reaction to contrast | 1 previous reaction to contrast | 4 claustrophobia | |
| 2 leg artery problems | 1 refusal | 2 refusals | |
| 1 refusals | |||
| Not done (fault lay elsewhere) | 1/73 | 6/68 | 6/59 |
| 1 (reason not collected) | 2 too ill | 1 too ill | |
| 3 ill/refused after DSA reaction | 5 ill/refused after DSA reaction | ||
| 1 (reason not collected) | |||
| Adverse reactions | 7/68 (10%) | 0 | 0 |
| 2 TIA | |||
| 1 groin haematoma* | |||
| 1 unstable angina | |||
| 1 required transfusion | |||
| 1 ischaemic leg | |||
| 1 non-occlusive iliac artery dissection | |||
| Procedure done but data lost | 1 | 1 | 0 |