Botox eases nerve pain ‘in certain patients’
Baltimore, June 12, 2010
Johns Hopkins University researchers have found that some patients with a painful and debilitating nerve compression disorder reported reduction in short-term pain after receiving a single, low-dose injection of Botox.
Botox, a toxin known to weaken or paralyze certain nerves and muscles, was administered in a muscle located in the neck of patients suffering from thoracic outlet syndrome (TOS), a condition which said to occur in up to 8 percent of the population.
Researchers suggested in the April issue of the journal Pain Medicine that Botox is a safe, noninvasive alternative to the syndrome’s treatment of last resort: surgery to remove the first rib and sever one of the muscles in the neck.
“There haven’t been many alternatives to the use of surgery to treat this syndrome,” said Paul J Christo, MD, MBA, an assistant professor of anesthesiology and critical care medicine at the Johns Hopkins University School of Medicine and the study’s lead author.
“Botox seems to be an effective treatment that avoids surgery’s obvious drawbacks, such as its invasive nature and long recovery time.”
Christo said his latest work significantly improves on previous studies in which TOS sufferers received several Botox injections or injections were made more blindly, without the aid of a CT scan.
TOS is caused by a compression of nerves in the lower neck, which occurs when there is not enough room in the cavity between the base of the neck and the armpit (the thoracic outlet) for nerve impulses to freely pass through.
Symptoms often develop in the neck or head and tend to shoot down the arm, causing often excruciating pain, numbness and/or weakness in the limb and extremities.
Christo and his colleagues evaluated 27 patients who were candidates for surgery to treat their TOS and for whom physical therapy and anti-inflammatory medications failed to help.
Each was given a 20-unit injection of Botox, a brand-name drug that contains botulinum toxin, made from the same bacterium that causes botulism, a paralyzing and life-threatening form of food poisoning.
Christo used a CT scanner to guide the placement of the needle in the patient’s anterior scalene muscle in the neck. Each session lasted around one minute, requiring minimal radiation, he says.
Patients experienced a significant decrease in pain in each of the first two months after the injection. At three months, patients still felt a 29 per cent decrease in their TOS-related pain as measured on a scientific pain scale.
“This modest amount of pain reduction can have a significant impact on a patient’s life,” said Christo. “For many, it allows them to do what they couldn’t do before — brush their hair, brush their teeth, hold their child.”
Christo said the Botox works to temporarily relieve the pain of TOS in many patients because its paralyzing function decreases the tension and spasms of the muscle, relieving pressure on the nerves as more room is made for them to pass through the thoracic outlet.
He added the drug may also decrease pain by reducing the number of neurotransmitters that notify the brain that the body is in pain. Though the study just looked at pain, Christo said some patients appeared to also have increased arm and shoulder function as a result of the Botox injections.
The effects of the drug begin to wear off in a few months, as they do when Botox is injected into facial wrinkles.
Christo said patients should be able to receive repeated injections of Botox into the muscle over time, though some could develop antibodies to the compound with excessive use, which would mean the toxin would no longer block pain.
In the study, 48 percent of patients went on to have surgery. Christo says that is because many of those who agreed to participate in the Botox study did so only as a bridge of pain relief before they could get a date in the operating room.
Others tried the Botox technique in the hope that they could avoid having surgery, he said. Not all patients were candidates for Botox, he added. – TradeArabia News Service
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