Coma -A person in a coma is unconscious, unaware, and unable to respond to external stimuli such as pain or light.If this state lasts longer than a few weeks, it is referred to as a persistent vegetative state. However, they can have periods of unresponsive alertness and may groan, move, or show reflex responses. Vegetative state -A result of widespread damage to the brain, people in a vegetative state are unconscious and unaware of their surroundings.

Minimally conscious state -People with severely altered consciousness who still display some evidence of self-awareness or awareness of one's environment (such as following simple commands, yes/no responses).Generally, there are four abnormal states that can result from a severe TBI: Loss of a skill, such as toilet trainingĪ TBI can cause problems with consciousness, awareness, alertness, and responsiveness.Seek immediate medical attention if you experience any of the following physical, cognitive/behavioral, or sensory symptoms, especially within the first 24 hours after a TBI: Some accidents such as explosions, natural disasters, or other extreme events can cause both penetrating and non- penetrating TBI in the same person. Causes include falls, motor vehicle crashes, sports injuries, blast injury, or being struck by an object. Non-penetrating TBI (also known as closed head injury or blunt TBI) is caused by an external force strong enough to move the brain within the skull.Penetrating TBI typically damages only part of the brain. Penetrating TBI (also known as open TBI) happens when an object pierces the skull (e.g., a bullet, shrapnel, bone fragment, or by a weapon such as hammer or knife) and enters the brain tissue.There are two broad types of head injuries: Penetrating and non-penetrating. These secondary brain injuries are the result of reactive processes that occur after the initial head trauma. Other outcomes of TBI can be secondary, meaning they can occur gradually over the course of hours, days, or appear weeks later. Some injuries are considered primary, meaning the damage is immediate. More serious TBI can lead to severe and permanent disability, and even death. Some types of TBI can cause temporary or short-term problems with normal brain function, including problems with how the person thinks, understands, moves, communicates, and acts. Not all blows or jolts to the head result in a TBI. A traumatic brain injury (TBI) can be caused by a forceful bump, blow, or jolt to the head or body, or from an object that pierces the skull and enters the brain.

Surface awaken system