A neck implant offers relief to people with chronic migraine by stimulating nerves in the neck with mild electrical pulses, say scientists.
Stephen Silberstein of Thomas Jefferson University in Philadelphia, Pennsylvania, and his colleagues fitted 157 people with a device that periodically stimulates the occipital nerves that feed up the neck into the rear of the brain.
The device was kept active for three months in 105 of the participants, while in the others it was switched off.
"Presuming the therapy continues to be effective, I would expect the patients it benefits to retain the implant for life," New Scientists quoted Silberstein as saying.
Although the mechanism by which it works remains unknown, he cited a recent research in animals that suggested that it reduces concentrations of a pain neurotransmitter in the nerves.
The device was approved a year ago in Europe, but is still awaiting approval in the US.