Types of Brain Injury

 There are different types of brain injuries.  Each type of brain injury is unique.  The differences in brain injuries depend on the type of applied force, the amount of force, and on where on the head the force was received.  The brain injury can affect just one functional area of the brain, several areas of the brain or the entirety of the brain. Sometimes I will use the term herein as “mild brain injury”. Please do not be misled.  “Mild” refers to the trauma that caused the injury. Mild does not describe the consequences which can be very severe to the injured party and can have severe effects on the family and relations.
Organic brain syndrome or OBS is an overall term which describes brain damage due to a medical (but not psychiatric) disease.  It is often simply called “dementia”.  Dementia can be caused by trauma but this is rare.  It is mostly caused by diseases.

The causes of organic brain injury are as follows:
  • Bleeding into the brain caused by trauma, also known as an intracerebral hemorrhage
  • Bleeding into the spaces around the brain, also known as a subarachnoid hemorrhage
  • Bleeding inside the skull from trauma, known as a subdural hematoma
  • Concussion from trauma
  • Hypoxia, which is low oxygen in the brain for whatever reason
  • Elevated CO2 levels in the body, a condition known as hypercapnia
  • Dementia caused by having many small strokes, called multi-infarct dementia
  • Stroke, which is a bleed or blood clot to the brain
  • Transient ischemic attack, or TIA, which is a temporary stroke
  • Infections of the heart, also called endocarditis or myocarditis
  • Most of the causes of organic brain injuries are from degenerative diseases.  The various types of degenerative disorders include the following:
  • Alzheimer dementia, which is the most common type of dementia
  • Creutzfeldt-Jacob disease-a contagious brain disease caused by eating raw cow brains
  • Diffuse Lewy body disease
  • Huntington disease, formerly called Huntington’s chorea
  • Multiple sclerosis-an autoimmune disease that destroys the brain’s myelin
  • Normal pressure hydrocephalus or extra pressure on the brain
  • Parkinson disease-a disease resulting from lack of dopamine in crucial parts of the brain
  • Pick disease or frontotemporal lobal degeneration
  • Organic brain disease can be due to total-body metabolic diseases.  Some of these conditions are as follows:
  • Chronic kidney disease
  • Liver disease
  • Hyperthyroidism or hypothyroidism
  • Vitamin deficiency such as vitamin B1, B2 or folate deficiencies
Various drug or alcohol-related conditions can contribute to organic brain disease.  These include the following:
  • Drug or alcohol intoxication
  • Alcohol withdrawal states
  • Withdrawal from sedative-hypnotic medication, corticosteroids and other drugs
  • Wernicke-Korsakoff syndrome, which is caused by malnutrition or long term heavy alcohol use
  • Certain infections can contribute to organic brain disease, including:
  • Blood poisoning, also called septicemia
  • Any infection, whether chronic or acute
  • Infection of the brain or encephalitis
  • Meningitis or infection of the lining of the brain and spinal cord
  • Mad cow disease, a type of prion disease
  • Syphilis in its late stages
Certain complications of cancer can cause organic brain injury.  Diseases that can mimic organic brain syndrome include neurosis, depression, or psychosis.
The major symptoms of organic brain injury include confusion, agitation, dementia-like symptoms and delirium.  Doctors can do various tests to identify the presence of organic brain injury and, in many cases, identify its cause.  These tests include blood tests, a CT scan of the head, an electroencephalogram, or an MRI.  Sometimes a lumbar puncture or spinal tap can help.

The treatment of organic brain injury is usually supportive and involves rehabilitation. In some cases, medication can reduce the aggressive behaviors sometimes seen in organic brain injury. Some organic brain disorders are brief and/or treatable but most worsen over time and are long-lasting

Acquired Brain Injury
An acquired brain injury results from damage to the brain secondary to tumors, anoxia, strokes, toxins, hypoxia, near drowning, degenerative diseases or other diseases not caused by an external force.

Brain Contusion
A brain contusion is caused by a direct blow to the head.    It causes bruising or bleeding within the brain.  If a contusion is large enough, it may need to be removed surgically as it is becomes dead brain tissue that causes swelling in the brain.

Concussion
The most “minor” of traumatic brain injuries is the concussion, although it can cause significant impairments or difficulties that can be lifelong.  Whiplash injuries can cause some of   the same symptoms as a head injury.  Rehabilitation can often   help neck injuries,   but many people are released from a doctor’s care without being properly referred to a brain injury rehabilitation facility or a neuropsychologist who can diagnose their injury and help them.

Concussions can be caused by blows to the head, a fall, gunshot wounds, whiplash injury   from a car or truck accident or by being shaken violently as in shaken baby syndrome.  Open and closed injuries can cause a concussion which is   the most common kind of traumatic brain injury. It is caused by impact to the head or by a sudden change in the momentum of the head.

Since the brain has the same consistency as jello, it is NOT necessary for the head to strike anything else in the car, for someone to have a concussion. The brain in the skull is propelled forward and strikes the skull because of the violent impact of a collision.

There can be stretching of the blood vessels within the brain and damage to the nerves of the brain.  Some people experience a short loss of consciousness.  Others feel an alteration of consciousness. The patient often feels dazed after the trauma.   A CT scan or MRI scan may be negative and someone may still have a severe brain injury.

There may be a skull fracture or bleeding on the brain.  Swelling might or might not be present.  This means that the diagnosis of concussion is mostly based on the patient’s neurobiological behavior and symptomology.

Diffuse axonal injury can occur, resulting in permanent or temporary brain damage.  A blood clot in the brain is possible and can result in death.  It can take several months or a few years for the symptoms of a concussion to resolve itself.

More brain injury types:
 
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