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The relevance of the Brissaud reflex A 70-year-old man who was admitted to neurointensive care with spastic tetraparesis and altered level of consciousness due to acute subdural hematoma and who had a history of left forefoot amputation presented right Babinski sign and left Brissaud reflex (video at Neurology.org). The Brissaud reflex is characterized by a contraction of the tensor fasciae latae due to stimulus over the plantar aspect of the foot, which is better visualized on the lateral aspect of the thigh.

Chronic migraine is recognized as a migraine complication and is characterized by frequency of attacks up to 15 days/ month for more than three months, in absence of painkiller abusive usage. Studies indicate that magnesium ion plays a role in migraine pathophysiology but, until now, they have never included only patients with chronic migraine as their population. Objective: To compare serum magnesium levels etween treated and non-treated chronic migraineurs. Methods: Twenty-two patients with chronic migraine were selected and divided in two groups (treated and non-treated), matched by sex and age, and submitted to serum dosage of magnesium ion for latter comparison. Result: The non-treated chronic migraineurs presented serum magnesium ion level within normal limits, but lower than those found in the treated group with a statistically significant difference. Conclusion: Similarly to other studies in the literature, this study stresses the importance of magnesium ion in the migraine pathophysiology, but studying only the chronic migraine patients.