Hypothalamus Connectivity in Chronic and Episodic Migraine in Headache-free Period: A Resting State Functional Magnetic Resonance Imaging Study

Functional magnetic resonance imagery allows identification of correlations during rest between remote brain areas (functional connectivity) through their highly correlated low-frequency spontaneous fluctuations. This technique is interesting because it is atraumatic, takes place in resting condition, without administration of substances. Only one study of connectivity with functional magnetic resonance imagery in resting state, in headache-free period of migraine, has shown differences in the connection of the periaqueductal gray matter to the pain matrix in migraineurs and controls. Our region of interest is the hypothalamus because our group demonstrated activation in this area during migraine attacks and we hypothesised that the hypothalamus could trigger migraine attacks. We want to compare 2 groups of migraineurs. The first group is composed of chronic migraineurs with >15 days with headache per month, compared to the 2nd group composed of age- and gender-matched episodic migraineurs with < 4 days of migraine per month, without prophylactic treatment. Our purpose is to study the connectivity of the hypothalamus to midbrain and pons areas activated in previous studies using positon emission tomography (PET) in spontaneous migraine attacks. The connectivity of the hypothalamus with the trigeminal-cervical complex, conveying the pain from cranial vasculature and dura-mater playing a major role in migraine attack, has never been studied before, mainly for anatomical reasons. Our secondary purpose is to study the connectivity of the hypothalamus with the pain matrix and the possible correlations with depression, allodynia and attack treatment overuse.

The primary outcome is the connectivity index of the hypothalamus to the midbrain and pons area known to be activated in migraine attacks and the trigeminal-cervical complex The secondary outcome is the connectivity index of the hypothalamus with the pain matrix (thalamus, sensitive-motor cortex, cingular cortex) This study is a comparative monocentric pathophysiological study of patients with migraine.