NUR 4227 Lecture Notes - Lecture 9: Cerebral Perfusion Pressure, Blunt Trauma, Cerebrospinal Fluid
Document Summary
Intracranial pressure (icp: hydrostatic force measured in the brain, cerebral spinal fluid (csf) compartment, normal conditions, balance, brain tissue, blood, csf. Primary injury: occurs at initial time of injury resulting in displacement, bruising or damage of the 3 components (brain tissue, blood, csf) i. e. motor vehicle crash (mvc); blunt force trauma. Secondary injury: result of hypoxia, ischemia, hypotension, edema or (cid:313) icp, can occur hours to days after initial injury. Factors influencing icp under normal conditions: in arterial pressure, venous pressure, intraabdominal and intrathoracic pressure; posture; temperature; blood gases (especially co2) Skull: closed box : filled to capacity with blood, brain tissue, csf. If volume of one or > then icp . Monro-kellie doctrine: 3 components must remain at a relative constant volume within the closed skull. If the volume of one of the 3 increases within the cranial vault and the volume of another is displaced the total volume will not change.
