Meta-analysis: comparison of BVR drainage patterns in patients with NAPH versus aSAH
| Nonaneurysmal Perimesencephalic Hemorrhage | Aneurysmal Subarachnoid Hemorrhage | OR | P Value | I2 | |
|---|---|---|---|---|---|
| Patients with at least 1 primitive BVR drainage pattern | 47.7% (148/310) | 22.1% (75/340) | 3.31 (2.15–5.08) | <.01 | 29% |
| Patients with normal bilateral BVR drainage pattern | 18.3% (61/334) | 37.4% (207/554) | 0.27 (0.14–0.52) | <.01 | 57% |
| Abnormal BVR drainage by venous system | 34.9% (220/630) | 15.3% (157/1027) | 3.90 (2.37–6.43) | <.01 | 70% |