a positive declaration intended to give confidence: He received assurances of support for the project. 2. promise or pledge; guaranty; surety: He gave his assurance that the job would be done. 3. full confidence; freedom from doubt; certainty: to act in the assurance of success.
Summary. Traumatic brain injury (TBI) happens when a bump, blow, jolt, or other head injury causes damage to the brain. Every year, millions of people in the U.S. suffer brain injuries. More than half are bad enough that people must go to the hospital. The worst injuries can lead to permanent brain damage or death.
How Brain Death Works. If pressure in the brain causes the ventricles to collapse, the results can be catastrophic. When the brain is injured, whether by natural causes or trauma, there are three possible results: bleeding, swelling, or both. Causes for damage to the brain that may result in brain death include: