Diagnosis of causative vascular lesions by repeated imaging in anSAH patients
| Overall | PAN-SAH | NPAN-SAH | P value | |
| (n=303) | (n=110) | (n=193) | ||
| Repeated imaging, no (%) | 272 (89.8) | 96 (87.3) | 176 (91.2) | 0.279† |
| CTA | 242 (89.0) | 85 (88.5) | 157 (89.2) | 0.868† |
| DSA | 120 (44.1) | 41 (42.7) | 79 (44.9) | 0.525† |
| MRA | 9 (3.3) | 6 (6.3) | 3 (1.7) | 0.085† |
| Diagnosis, no (%) | 21 (7.7) | 2 (2.1） | 19 (10.8) | 0.010†* |
| Saccular aneurysm | 18 (6.6) | 1 (1.0) | 17 (9.7) | |
| Dissecting aneurysm | 3 (1.1) | 1 (1.0) | 2 (1.1) |
*p<0.05.
†χ2 test.
anSAH, angiogram-negative subarachnoid haemorrhage; CTA, CT angiography; DSA, digital subtraction angiography; MRA, MR angiography; NPAN-SAH, non-perimesencephalic angiogram-negative SAH; PAN-SAH, perimesencephalic angiogram-negative SAH.