Overall characteristics
| Characteristics | No. |
|---|---|
| Total studies | 2003 |
| Location | |
| University of New Mexico | 139 (6.9%) |
| University of Pennsylvania | 170 (8.5%) |
| University of Pittsburgh | 649 (32%) |
| Stanford | 710 (35%) |
| Baylor College of Medicine | 236 (12%) |
| Medical College of Wisconsin | 82 (4%) |
| Medical College of Virginia | 17 (0.8%) |
| Mechanically ventilated | 517 (25.8%) |
| Chemically paralyzed | 211 (40.7% of ventilated) |
| Nonventilated | 1486 (74.2%) |
| Indication (some studies listed several) | |
| Occlusive vascular disease | 705 (35%) |
| Ischemic stroke | 537 (27%) |
| Traumatic brain injury | 323 (16%) |
| Vasospasm after subarachnoid hemorrhage | 271 (14%) |
| Hemorrhagic stroke | 96 (4.8%) |
| Skull base aneurysm or tumor | 62 (3.1%) |
| Epilepsy | 5 (0.2%) |
| Brain tumor | 3 (0.15%) |
| Dementia | 2 (0.1%) |
| Hydrocephalus | 1 (0.05%) |
| Other | 6 (0.3%) |