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10-Jul-2014

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What's a concussion? Review identifies four evidence-based indicators

First step in developing evidence-based concussion guidelines, published by Neurosurgery

(July 10, 2014) – A research review identifying the clinical indicators most strongly associated with concussion is an important first step in the process of developing evidence-based guidelines for concussion diagnosis, prognosis, and treatment, according to a new report published by Neurosurgery, official journal of the Congress of Neurological Surgeons. The journal is published by Lippincott Williams & Wilkins, a part of Wolters Kluwer Health.

Based on analysis of the best available research data, a multidisciplinary panel of experts has identified a set of four indicators with the "highest and most consistent prevalence" among patients with possible concussion. "This is the initial step toward developing a scientifically based approach to recognition and management of concussion—a process that is critically important in reducing the impact of concussion and brain injury on the lives of patients and the public," comments Nelson M. Oyesiku, MD, PhD, Editor-in-Chief of Neurosurgery.

Four evidence-based indicators of concussion…

The expert panel followed a systematic process to identify studies providing information on symptoms and observable factors associated with concussion. Out of more than 5,000 publications, only 26 met standards for minimizing risk of bias, and other criteria required for inclusion. The lead author of the new report is Nancy Carney, PhD, of Oregon Health & Science University, Portland, who is also the Director of Research for the Brain Trauma Foundation. The project was funded by the US Army Contracting Command, with additional funding from the Brain Trauma Foundation.

Based on 11 independent patient samples, the panel identified four indicators of concussion in awake individuals

The studies also provided information on the results of cognitive tests over time. The proportion of tests given to individuals diagnosed with concussion that showed abnormal function ranged from 58 percent on the first day to eight percent at one week after injury.

In the one study meeting quality and inclusion standards that was included in the report, the most commonly reported symptoms were headache, dizziness, blurred vision, and nausea. However, because this information comes from just one study, the crucial question about the "signature symptoms" of concussion remains unanswered.

…Set the stage for developing evidence-based guidelines

Concussion is a common and familiar problem, yet one that has been defined in different ways. Since there's no objective test or universally accepted definition, establishing a set of indicators based on the best available research is an important first step to developing evidence-based concussion guidelines.

The new analysis provides "an evidence-based foundation" from which to develop a set of evidence-based guidelines for the diagnosis, prognosis (outcome prediction) and treatment of concussion. The panel acknowledges some important limitations of their work, including the fact the studies were mainly performed in athletic populations. More studies of patients with possible concussion in the emergency department and military settings are needed.

To develop a more specific definition of concussion, research is needed that clearly distinguishes between potentially concussive injury and true concussion. In order to take the next step and develop evidence-based diagnostic criteria, more data are needed about the association between signs, symptoms, and deficits of true concussion.

"It is important to understand that the findings in this report are limited by the nature and quality of the available scientific studies. Clearly, more research is needed in order to derive a comprehensive and evidence-based picture of concussion" Dr. Carney comments. The expert panel also makes recommendations for improving the design of future concussion studies, including the use of comparison groups; taking measurements at fixed and relevant time points; reporting distinct signs, symptoms, and deficit, including their relationships to each other; and following standards to minimize bias and confounding.

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Click here to read "Concussion Guidelines Step 1: Systematic Review of Prevalent Indicators."

About Neurosurgery

Neurosurgery, the Official Journal of the Congress of Neurological Surgeons, is your most complete window to the contemporary field of neurosurgery. Members of the Congress and non-member subscribers receive 3,000 pages per year packed with the very latest science, technology, and medicine, not to mention full-text online access to the world's most complete, up-to-the-minute neurosurgery resource. For professionals aware of the rapid pace of developments in the field, Neurosurgery is nothing short of indispensable.

About Wolters Kluwer Health

Wolters Kluwer Health is a leading global provider of information, business intelligence and point-of-care solutions for the healthcare industry. Serving more than 150 countries worldwide, clinicians rely on Wolters Kluwer Health's market leading information-enabled tools and software solutions throughout their professional careers from training to research to practice. Major brands include Health Language®, Lexicomp®, Lippincott Williams & Wilkins, Medicom®, Medknow, Ovid®, Pharmacy OneSource®, ProVation® Medical and UpToDate®.

Wolters Kluwer Health is part of Wolters Kluwer, a market-leading global information services company. Wolters Kluwer had 2013 annual revenues of €3.6 billion ($4.7 billion), employs approximately 19,000 people worldwide, and maintains operations in over 40 countries across Europe, North America, Asia Pacific, and Latin America. Follow our official Twitter handle: @WKHealth.



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