Brain Injuries

Traumatic Brain Injuries (TBI) are a leading cause of death and disability in the United States, and car accidents are one of the leading causes of TBIs.

And, as you will learn later, many TBIs are not initially diagnosed and do not result in hospitalizations, so there are actually many more TBIs than those included in these statistics.

How costly are TBIs to American society? It was estimated, in 1995, that the direct and indirect costs of Traumatic Brain Injury (TBI) totaled $56.3 billion in the U.S.

What Exactly is a Traumatic Brain Injury (TBI)?

As the name suggests, and as this definition states, a TBI is an injury to the brain that results from an external force, or trauma, to the head. In other words, it’s a head injury that causes damage to the brain.

The “external force” can be a direct blow to the head such as hitting the floor in a fall accident or striking the steering wheel in a car accident. Even though the skull is not penetrated or fractured, the force can cause the brain to be injured in a number of ways.

Or, the “external force” can be a rapid acceleration and deceleration of the head that shakes or rotates the brain. Examples of this are whiplash in a car accident or Shaken Baby Syndrome.

As the BIA definition states, the “external force” damages the tissues and cells of the brain causing temporary or permanent impairment in the cognitive, emotional and physical abilities of an individual.

There are two types of head injuries that damage the brain. A Penetrating Head Injury is a brain injury that occurs when an object – such as a knife or bullet -- penetrates the skull or the skull is fractured. In that case, bone fragments, foreign material or dirt can get into the brain, damage brain tissue and cause infection.

However, most TBIs are Closed Head Injuries (CHI) that do not involve penetration of the brain.

In a Closed Head Injury, trauma to the head sets the brain in motion inside the skull. Depending upon the degree and direction of the forces applied, the brain can be damaged in many different ways. These include surface contusions of the brain from a coup-contre coup (an initial blow followed by a rebound against the opposite side of the skull) and twisting and stretching from rotational force which damage fine structures like axons.

Let me explain this second example.

Specialized brain cells called neurons do the processing work of the brain (such as thinking). Axons -- long, hollow tubular structures that project from the neurons -- form the “wiring” that links neuronal processing centers.

External forces can cause Axons to be damaged by twisting or stretching, preventing the neurons from functioning properly.

Diffuse Axonal Injury (DAI) occurs on the cellular level and is visible only under a microscope at an autopsy. It is widely diffused and typically leaves blood vessels and major structures intact. Therefore, these Diffuse Axonal Injuries (DAI) do not appear on CTs or MRIs. As a result, this type of subtle TBI is a very under-diagnosed and under-treated malady. It is a “Silent Epidemic.”

Obviously, not all TBIs are equally serious. They range from catastrophic to subtle. However, even subtle brain injuries can have significant, permanent, life-altering consequences for the patient.

What are the Common Symptoms of
a Traumatic Brain Injury (TBI)?

However, common physical symptoms can include . . .

** seizures of all types.

** muscle spasticity.

** double vision, blurred vision or low vision, even blindness.

** loss of smell or taste.

** speech impairments such as slow or slurred speech.

** headaches or migraines.

** fatigue, increased need for sleep.

** balance problems.

Cognitive symptoms can include . . .

** short-term memory loss, long-term memory loss.

** slowed ability to process information.

** trouble concentrating or paying attention for periods of time.

** difficulty keeping up with a conversation, and other communication difficulties such as word finding problems.

** spatial disorientation.

** organizational problems and impaired judgment.

** unable to do more than one thing at a time.

** a lack of initiating activities, or once started, difficulty in completing tasks without reminder.

Emotional symptoms can include . . .

** increased anxiety.

** depression and mood swings.

** impulsive behavior.

** more easily agitated.

** egocentric behaviors, difficulty seeing how behaviors can affect others.

If you have any of these symptoms after a whiplash injury, especially if they persist for more than a few days, you should be evaluated to see if you have a Traumatic Brain Injury (TBI).

While they experience the same symptoms as a normal adult, children and seniors present unique symptoms and diagnostic problems.

Does there have to be a loss of consciousness to incur a brain injury?

No, loss of consciousness (LOC) is not required. Research has shown that brain injury can occur without loss of consciousness and that the neuropsychological consequences of TBI without loss of consciousness do not differ in severity from those occurring when there is a brief comatose period.

What is required is any alternation of the state of consciousness, such as being dazed or confused or "seeing stars."

Click here to go from this discussion of brain injuries to a general discussion of car accident injuries.