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Traumatic Brain Injury: FDA Actions AND Research

Causes of Traumatic Brain Injury - 4 Photos (350x350)

Traumatic brain injury, which includes concussions, can happen in a variety of situations. And everyone is at risk, especially children AND older adults.


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A car accident. A football tackle. An unfortunate fall. These things—and more—can cause head injuries. Head injuries can happen to anyone, at any age, & they can damage the brain.

Here’s how damage can happen: A sudden movement of the head & brain can cause the brain to bounce or twist in the skull, stretching AND injuring brain cells & creating chemical changes. This damage is called a traumatic brain injury, or “TBI.”

Today, the U.S. Food & Drug Administration continues to research TBI—and encourage the development of new medical devices to help diagnose & treat it.

Causes & Symptoms of TBI 

TBI is often caused by a bump, blow, jolt, or explosive blast to the head, or a penetrating head injury that disrupts the brain’s normal function. Not all hits to the head result in TBI. But when it happens, TBI can range from “mild” (such as a brief change in mental status or consciousness) to “severe” (such as an extended period of unconsciousness or major problems with thinking & behavior after injury).

In 2013, about 2.8 million TBI-related emergency Department (ED) visits, hospitalizations, and deaths occurred in the United States, according to the Centers for Disease Control & Prevention (CDC).

A concussion is a form of mild TBI—and about 75 percent of TBIs that occur each year are this type.

Symptoms of mild TBI include:

  • headache

  • confusion

  • blurred vision, AND

  • behavioral changes.

Moderate & severe TBI can include those symptoms plus:

  • repeated vomiting or nausea,

  • slurred speech,

  • weakness in the arms or legs, &

  • problems with thinking abilities.

You can learn more about symptoms from the National Institute of Neurological Disorders & Stroke (NINDS).

Diagnosis of TBI

A medical exam is the first step in diagnosing potential head injury. Assessment usually includes a neurological exam, a typically painless exam that includes an evaluation of thinking, motor function (movement), sensory function, coordination, & reflexes.

But it can be hard to officially diagnose TBI. No universally accepted “gold standard” for diagnosing TBI has been established, though the CDC, the American College of Rehabilitation Medicine, & some other people have published guidelines for diagnosing TBI.

Imaging tests, including computerized tomography scans (“CT” scans) & magnetic resonance imaging (MRI) tests do not diagnose TBI, but they can help doctors rule out a life-threatening injury to the brain (particularly bleeding that resulted from the traumatic injury that can require immediate medical or surgical attention).

How the FDA Supports Getting Medical Devices to Patients in the United States 

In 2016, the FDA, which reviews and evaluates medical devices for safety & effectiveness, allowed the marketing of two devices that assess cognitive function following suspected brain injury in adults & children.

In 2018, the FDA also allowed marketing of the first blood test to evaluate concussion (mild TBI) in adults. This test works by measuring levels of proteins (known as UCH-L1 & GFAP) that are released from the brain into blood & measured within 12 hours of a head injury. Levels of these blood proteins after a concussion can help predict which patients may have an injury to the brain that would be visible by CT scan—and which patients won’t. So the test, along with other patient-specific information AND testing, helps health care providers determine the need for CT scans, in patients at minimal risk, which can help prevent unnecessary follow-up testing. 

The FDA also is working with the research & clinical community to develop better-designed clinical studies so new medical products can be developed. 

But the FDA has not yet cleared or approved standalone medical products that are intended to specifically diagnose or treat TBI.  

“We’re excited about today’s advances in research AND development,” says Christian Shenouda, M.D., a clinician & medical device reviewer in the FDA’s Division of Neurological and Physical Medicine Devices. “We hope these advances will lead to further patient access to additional diagnostics & treatments.”

FDA Research on TBI

More sensitive & objective diagnostic methods to detect mild TBI are needed. Timely diagnosis is important to prevent repetitive injury & to help develop new therapies. So the FDA continues to research diagnostic measures of mild TBI.

“Repetitive injury carries the risk of ‘second impact syndrome.’ If people who have not recovered from a head injury have a second head injury, this can result in more significant injury to the brain & more neurological deficits. &, in some cases, repetitive injury can be fatal,” explains Meijun Ye, Ph.D., a neuroscientist in the FDA’s Office of Science & Engineering Laboratories.

FDA scientists are studying biomarkers (measurable, biological indicators of a particular state or condition), such as brain imaging, biofluid (specific proteins in blood), & physical indicators such as eye tracking and electroencephalography (EEG). “EEG is the measurement of electrical activity in the brain along the scalp. It holds promise because it’s fast, portable, & typically less expensive than MRI & CT,” Ye says.

Highlights? After scientists developed a small animal “blast” TBI model with high-intensity focused ultrasound, and checked accuracy (called “validation”), they found EEG can detect mild TBI in this model. “These results, & other people by FDA regulatory science labs, contribute to the TBI scientific community & efforts to develop diagnostic devices,” Ye notes.

The FDA is now validating results from other animal models (such as when injuries are produced by a bump or jolt). Scientists also are working with human volunteers with Walter Reed National Military Medical Center in Bethesda, Maryland. And they’re recruiting more adult patients—including those with & without TBI—for continued research.

In addition to EEG, they are investigating using other portable imaging devices to detect mild TBI, such as diffuse correlation spectroscopy that can monitor blood flows in the brain from the scalp

What to Do if You Suspect Traumatic Brain Injury

Anyone with signs of moderate or severe TBI should receive medical attention as soon as possible, advises the National Institute of Neurological Disorders and Stroke.

People who survive TBI can face short- or long-term complications that affect thinking, sensation (including sight or balance), language, or emotions.  

People with their first, mild TBI may just need to rest AND reduce vigorous activity for a short period of time, while those with moderate to severe TBI may require physical therapy (to help with body movement), occupational therapy (to help with conducting daily activities), or psychiatric therapy & other support.

Little can be done to reverse the initial brain damage caused by trauma, the institute reports. But medical professionals will work to stabilize the patient & try to prevent further harm.

Long-term effects depend on the seriousness of the injury, location of the injury, & the age & general health of the patient.

For any TBI, it’s important to follow up with medical professionals as needed.

Updated: February 14, 2018

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Source: fda.gov

Updated: March 4, 2018 — 4:31 pm

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