Head Injury in Adults

What Is It?

Trauma to the head can cause several types of head injuries. They include:

• Skull fracture A skull fracture is a crack or break in one of the skull's bones. In some cases, the skull is dented inward so that fragments of shattered bone are pressed against the surface of the brain. This is called a depressed skull fracture. In most cases, a skull fracture causes a bruise (contusion) on the surface of the brain under the fracture.
• Epidural hematoma This is a very serious form of bleeding that happens when one of the blood vessels under the skull is torn during an injury. Usually the skull is fractured as well. As the injured vessel bleeds, blood collects in the space between the skull and the dura, the outermost of the three membranes that cover the brain. This collection of blood is called a hematoma. The hematoma can expand within the skull and press on the brain, causing death.
• Acute subdural hematoma In this injury, a blood vessel tears, and blood collects between the dura and the surface of the brain. This can happen when the head is hit or when a sudden stop causes the head to move violently forward and back (whiplash). A brain injury from whiplash is most common in the elderly and in people taking blood-thinning medications. Acute subdural hematoma develops rapidly, most commonly after serious head trauma caused by an assault, car accident or fall. It is a very severe brain injury that typically causes unconsciousness, and it is fatal in about 50% of cases.
• Chronic subdural hematoma Unlike the acute form, this type of subdural hematoma usually develops gradually because the bleeding inside the skull is less dramatic, and the hematoma can accumulate in several small, separate episodes of bleeding. A chronic subdural hematoma typically follows a fairly minor head injury in a person who is elderly, who is taking blood-thinning medications or whose brain has shrunk as a result of alcoholism or dementia. Symptoms develop gradually over one to six weeks. The most common symptoms are drowsiness, inattentiveness or confusion, headaches, changes in personality, seizures and mild paralysis.
• Intraparenchymal hemorrhages and contusions Intraparenchymal hemorrhages (bleeding) and contusions (bruising) occur within the brain itself rather than between the brain and the skull. Both of these injuries can be caused by either a direct impact to the brain or an indirect injury, in which the force of an impact on one side of the brain causes the brain to bounce or ricochet within the skull. This causes a second area of damage on the side of the brain opposite the original impact.

Head trauma also can cause swelling inside the brain and a potentially deadly increase in pressure inside the skull. Head injury also can seriously damage brain cells (neurons). In some cases, these cells are destroyed immediately by the impact of a head injury. In other cases, the damaged neurons take longer to wither and die.

Each year, head injuries result in more than 2 million emergency department visits in the United States, with more than 72,000 deaths. An additional 80,000 to 210,000 people with moderate or severe head injuries become disabled or require extended hospital care. Overall, traumatic head injuries are the most common cause of death among Americans aged 45 and younger. In addition, head injuries resulting from falls are a very common cause of hospitalization and death among people older than 75. Men are three to four times more likely than women to sustain head injuries, and alcohol use is involved in about 50% of cases.

In the United States, the most common causes of closed head injuries, as opposed to open injuries, such as gunshot wounds, are motor vehicle accidents, falls and violent assaults. Because of the extreme forces involved in these types of trauma, up to 75% of people with severe head injuries also suffer serious damage to the neck bones or to major organs in other parts of the body. These additional injuries often increase the risk of blood loss, breathing difficulties, very low blood pressure (hypotension) and other problems that can worsen the damage caused by the brain injury alone.

Symptoms

Head injuries can cause a wide variety of symptoms, depending on the type of injury, its severity and its location. Some doctors classify head injuries into three categories, based on symptoms:

• Mild head injury There is minimal injury to the outside of the head, with no loss of consciousness. The injured person may vomit once or twice and complain of a headache.
• Moderate head injury There is a more obvious injury to the outside of the head, and the person may have lost consciousness briefly. Other symptoms can include memory loss (amnesia), headache, dizziness, drowsiness, nausea and vomiting, confusion, a bruise-like discoloration around the eyes or behind the ear, or a clear fluid oozing from the nose. This fluid is not mucus, but fluid from around the brain (cerebrospinal fluid) that has leaked through a skull fracture near the nose.
• Severe head injury There is serious damage to the outside of the head, often together with injuries involving the neck, arms or legs or major body organs. In most cases, the person is either unconscious or barely responsive. However, some people become agitated or physically aggressive. About 10% of people with severe head injury have seizures.

Diagnosis

All head injuries should be evaluated promptly by a doctor, so either call for emergency help or have a friend or family member drive you to an emergency department. Once you arrive at the emergency department, the doctor will want to know:

• How you hurt your head, including the height of your fall or your position (front seat, back seat, driver) in a car accident
• Your immediate reaction to the injury, especially any loss of consciousness or memory loss
• Any symptoms that occurred soon after the injury, such as vomiting, headache, confusion, sleepiness or seizures
• Your current medications, including alcohol and nonprescription drugs
• Your past medical history, especially any neurological problems (stroke, epilepsy, etc.) and any prior episodes of head injury
• Whether you are having pain in your neck, chest, abdomen, arms or legs

If you are not able to answer these questions, the information can be provided by a family member, friend or the emergency medical personnel who brought you to the hospital.

The doctor will give you a physical and neurological examination, including assessments of your pupil size, reflexes, sensation and muscle strength. If the results of these exams are normal, you may not need further tests. However, the doctor may decide to monitor your condition in the hospital.

If you have more severe head injuries, emergency personnel will try to stabilize your condition as much as possible before arrival at the hospital. To do this, they may pass a tube down your throat and windpipe (trachea) to help breathing with a mechanical ventilator, control any bleeding from open wounds, give medication intravenously (injected into a vein) to maintain blood pressure, and immobilize the person's neck in case of a cervical fracture. Once you arrive at the hospital and are stabilized, the doctor will do a brief physical and neurological evaluation. This will be followed by a computed tomography (CT) scan of the head and spinal X-rays, if necessary. In most cases, a CT scan is the best way to detect skull fractures, brain injury or bleeding inside the head.

Expected Duration

Even if your head injury is only mild, you may have difficulty concentrating temporarily and may experience occasional headaches, dizziness and fatigue. This collection of symptoms, called postconcussion syndrome, usually improves within three months.

More severe forms of head injury can be fatal. Those that are not fatal sometimes require an extended hospital stay with prolonged rehabilitation. According to one large study, the average length of stay in a rehabilitation facility is 61 days. In some cases, disability is permanent.

Prevention

To help prevent head injuries, try the following suggestions:

• If you drink alcohol, drink in moderation. Never drink and drive.
• Wear a seat belt or helmet.
• If you play sports, wear appropriate protective headgear.
• If your job involves working high above the ground, use approved safety equipment to prevent accidental falls. Never work in a high place if you feel dizzy or light-headed, have been drinking alcohol, or are taking medication that can make you dizzy or affect your balance.
• Have your vision checked at least once a year. Poor vision can increase your risk of falls and other types of accidents. This is especially true if you are elderly or if you work in high places.

Treatment

If you have minor head trauma, your doctor may decide to monitor your condition in the emergency department for a short period of time or to admit you to the hospital for a brief period of observation. While you are in the emergency department or in a hospital room, medical personnel will ask you periodically about your symptoms, check your vital signs and confirm that you are awake and can respond. Once your doctor is satisfied that you can be sent home safely, he or she will allow you to leave on the condition that a responsible adult will stay with you at home for a day or two to help monitor your condition. This person will be given specific instructions about possible danger signs to watch for.

If you are troubled by headaches after your head injury, your doctor may suggest that you try acetaminophen (Tylenol) first. If this does not work, your doctor probably will prescribe a stronger pain reliever. Avoid taking aspirin, ibuprofen (Advil, Motrin), naproxen (Naprosyn) or indomethacin (Indocin) during your recovery period since these drugs can increase the risk of bleeding inside the head.

In people with more extensive head injuries, treatment depends on the type of injury, its severity and its location. In many cases, treatment takes place in an intensive care unit with mechanical ventilation (breathing assistance) and with medications to control pain, decrease swelling inside the brain, maintain blood pressure and prevent seizures. Surgery may be performed to repair a depressed skull fracture, drain an epidural or subdural hematoma or treat a brain hemorrhage or contusion.

When To Call a Professional

Call for emergency help immediately if you find someone unconscious at an accident scene. Also call for emergency help if someone with a serious head injury experiences any of the following symptoms:

• Headache
• Dizziness
• Drowsiness
• Nausea and vomiting
• Confusion
• Difficulty walking
• Slurred speech
• Memory loss
• Poor coordination
• Irrational behavior
• Aggressive behavior
• Seizures
• Numbness or paralysis in any part of the body

Even if your head injury appears to be less severe, and your symptoms are mild, it may be possible that you have had significant damage to the brain or its surrounding structures. This is especially true if you:

• Are elderly
• Take medication to thin the blood
• Have a bleeding disorder
• Have a history of heavy alcohol use

If you have one or more of the risk factors listed above, call a doctor or go to an emergency department immediately.

Prognosis

The outlook depends on the severity of the injury:

• Mild head injuries The prognosis is usually very good. Although some people experience postconcussion syndrome, this typically goes away after about three months. In most cases, there is no long-term damage, although improvement may be gradual.
• Moderate head injuries The most dramatic improvement usually occurs within the first one to six weeks. After that time, there may be some remaining problems with memory or attention, but these may not be permanent.
• Severe head injuries Up to 50% of severe head injuries are fatal. Among people who survive these injuries, about 20% suffer severe disabilities.

Additional Info

National Institute of Neurological Disorders and Stroke

P.O. Box 5801

Bethesda, MD 20824

Phone: 301-496-5751

Toll-Free: 1-800-352-9424

TTY: 301-468-5981

http://www.ninds.nih.gov/

American Academy of Neurology (AAN)

1080 Montreal Ave.

St. Paul, MN 55116

Phone: 651-695-2717

Toll-Free: 1-800-879-1960

Fax: 651-695-2791

http://www.thebrainmatters.org/

Family Caregiver Alliance

180 Montgomery St.

Suite 1100

San Francisco, CA 94104

Phone: 415-434-3388

Toll-Free: 1-800-445-8106

Fax: 415-434-3508

Email: info@caregiver.org

http://www.caregiver.org/

National Rehabilitation Information Center (NARIC)

4200 Forbes Blvd.

Suite 202

Lanham, MD 20706

Phone: 301-459-5900

Toll-Free: 1-800-346-2742

TTY: 301-459-5984

Email: naricinfo@heitechservices.com

http://www.naric.com/

Brain Injury Association of America

8201 Greensboro Drive

Suite 611

McLean, VA 22102

Phone: 703-761-0750

Toll-Free: 1-800-444-6443

Fax: 703-761-0755

Email: familyhelpline@biausa.org

http://www.biausa.org/

Brain Trauma Foundation

523 E. 72nd St.

New York, NY 10021

Phone: 212-772-0608

Fax: 212-772-0357

http://www.braintrauma.org/

National Institute on Disability and Rehabilitation Research

400 Maryland Ave., S.W.

Washington, DC 20202-7100

Phone: 202-245-7640

TTY: 202-245-7316

http://www.ed.gov/about/offices/list/osers/nidrr/index.html?src=mr/

National Highway Traffic Safety Administration

U.S. Department of Transportation

400 7th St., SW

Washington, DC 20590

Toll-Free: 1-888-327-4236

Email: webmaster@nhtsa.dot.gov

http://www.nhtsa.dot.gov/

U.S. Consumer Product Safety Commission (CPSC)

4330 East-West Highway

Bethesda, MD 20814-4408

Phone: 301-424-6421

Toll-Free: 1-800-638-2772

Fax: 301-413-7107

Email: info@cpsc.gov

http://www.cpsc.gov/