Pierre Fayad, M.D., a University of Nebraska Medical Center neurologist, was part of the 13-member team that co-authored the statement. Dr. Fayad is professor in the UNMC Department of Neurological Sciences and director of The Nebraska Medical Center Stroke Center.
The group was headed by Jose' Biller, M.D., of the Loyola University Health System in Chicago, and Ralph Sacco, M.D., of the University of Miami Hospital, with other members representing the Mayo Clinic, Washington University in St. Louis, the University of Connecticut, Tufts University, and the University of Kansas, among others.
Cervical artery dissection (CD) is a small tear in the layers of artery walls in the neck. It can result in ischemic stroke if a blood clot forms after a trivial or major trauma in the neck and later causes blockage of a blood vessel in the brain.
"Cervical artery dissection is an important cause of stroke in young and middle-aged adults, and it is often unrecognized," Dr. Fayad said.
"Most dissections involve some trauma, stretch or mechanical stress," Dr. Biller said. "Sudden movements that can hyperextend or rotate the neck - such as whiplash, certain sports movements, or even violent coughing or vomiting - can result in CD, even if they are deemed inconsequential by the patient."
Although techniques for cervical manipulative therapy vary, some maneuvers used as therapy by health practitioners also extend and rotate the neck and sometimes involve a forceful thrust.
There are four arteries that supply blood to the brain: the two carotid arteries on each side of the neck, and the two vertebral arteries on the back of the neck. The influence of neck manipulation seems more important in vertebral artery dissection than in internal carotid artery dissection.
"Although a cause-and-effect relationship between these therapies and CD has not been established and the risk is probably low, CD can result in serious neurological injury," Dr. Biller said. "Patients should be informed of this association before undergoing neck manipulation."
The association between cervical artery dissection and cervical manipulative therapies was identified in case control studies, which aren't designed to prove cause and effect. An association means that there appears to be a relationship between two things, i.e., manipulative therapy of the neck and a greater incidence of cervical dissection/stroke. However, it's not clear whether other factors could account for the apparent relationship.
The relationship between neck manipulation and cervical artery dissection is difficult to evaluate because patients who already are beginning to have a cervical artery dissection may seek treatment to relieve neck pain, a common symptom of cervical artery dissection that can precede symptoms of stroke by several days.
You should seek emergency medical evaluation if you develop neurological symptoms after neck manipulation or trauma, such as:
· Pain in the back of your neck or in your head;
· Double vision;
· Unsteadiness when walking;
· Slurred speech;
· Nausea and vomiting;
· Jerky eye movements.
"Tell the physician if you have recently had a neck trauma or neck manipulation," Dr. Biller said. "Some symptoms, such as dizziness or vertigo, are very common and can be due to minor conditions rather than stroke, but giving the information about recent neck manipulation can raise a red flag that you may have a CD rather than a less serious problem, particularly in the presence of neck pain."
In addition to Dr. Fayad, other co-authors included: Ralph L. Sacco, M.S., M.D., co-chair; Felipe C. Albuquerque, M.D.; Bart M. Demaerschalk, M.D., M.Sc.; Pierre Fayad, M.D.; Preston H. Long, D.C., Ph.D.; Lori D. Noorollah, M.D.; Peter D. Panagos, M.D.; Wouter I. Schievink, M.D.; Neil E. Schwartz, M.D. Ph.D.; Ashfaq Shuaib, M.D.; David E. Thaler, M.D., Ph.D.; and David L. Tirschwell, M.D., M.Sc., on behalf of the American Heart Association Stroke Council.
The scientific statement is endorsed by the American Association of Neurological Surgeons and the Congress of Neurological Surgeons.
· An audio interview with lead author, Dr. Jose Biller, a Skype video interview with Ralph Sacco. M.D. the statement co-author, author photos and illustrations related to cervical dissection are available on the right column of the release link http://newsroom.heart.org/
· Follow AHA/ASA news on Twitter @HeartNews.
· For stroke science, follow the Stroke journal at @StrokeAHA_ASA
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