A recent report by neurologists from the Mayo Clinic suggests that onabotulinumtoxinA (Botox) injections can relieve not only headache pain, but associated neurological symptoms, such as visual aura, numbness and weakness, which can precede or accompany a migraine attack. This article describes 11 patients with hemiplegic migraine, which means that these patients developed weakness on one side of their body prior and during an attack. From the description of these cases, it appears that at least a couple of patients had migraine with sensory-motor aura rather than true hemiplegic migraine. But regardless of the precise nature of their symptoms, Botox was effective in reducing these symptoms, along with headaches in 9 out of 11 patients. Ten of the 11 patients had chronic migraine and on average they failed five preventive drugs before starting Botox.
Two of the physicians who wrote the report have already presented some of these cases in 2013. As mentioned in the blog post describing this older report, I have also successfully treated many patients with visual, sensory and motor aura with Botox injections. Just like with patients in the current article, many of my patient responded to Botox after failing several preventive drugs.
We seem to understand how Botox relieves pain, but it is less clear how it helps neurological symptoms such as weakness, numbness and visual impairment. One possible explanation is that Botox reduces painful messages from the surface of the skull to the brain, which reduces excitability of the brain and this in turn prevents the brain from generating a migraine attack, including its associated symptoms.
