| ABG | Arterial blood gas analysis |
| 2,3-DPG | 2,3-Diphosphoglycerate |
| SD | Source-detector |
| CT | Computerized tomography |
| ICP | Intracranial pressure |
| CO2 | Carbon dioxide |
| ARDS | Acute respiratory distress syndrome |
| DOT | Diffuse optical tomography |
| CBF | Cerebral blood flow |
| CPP | Cerebral perfusion pressure |
| ECT | Extracranial tissue |
| Hb | Hemoglobin |
| HHb | Deoxyhemoglobin |
| ICG | Indocyanine green |
| FEM | Finite-element method |
| MAP | Mean arterial pressure |
| MRI | Magnetic resonance imaging |
| NIRS | Near-infrared spectroscopy |
| NO | Nitric oxide |
| BBB | Blood–brain barrier |
| O2 | Oxygen |
| O2Hb | Oxyhemoglobin |
| PaO2 | Arterial partial oxygen pressure |
| PbtO2 | Tissue partial oxygen pressure |
| SIADH | Syndrome of inappropriate antidiuretic hormone secretion |