Atrioventricular Block and Cluster Headache (SEVA)

Inclusion Criteria: * patient 18 years old, and older * patient suffering from Cluster Headache (according to the l'ICHD-3 diagnostic criterias) * patients affiliated to the social security * patient that has given his full written consent to participate in the study * female patients participating in the study must be using an efficient contraception for more than 1 month prior to the beginning of the study Exclusion Criteria: * patient presenting contraindications to the use of verapamil * patient observing a treatment with ivabradine (Procoralan®), bétablockers, colchicine, l'esmolol, triazolam, quinidine. * patient under justicial protection * patient breastfeeding, or pregnant * patient suffering from a neuromuscular transmisson disease * patient with a pacemaker