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. 2013 Jul;33(10):816–830. doi: 10.1177/0333102412473667

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© International Headache Society 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav

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Figure 4. — Change in cluster headache (CH) attack frequency (average attacks per week) shown at pre-implant baseline (BL), start of stimulation (SS), and end of experimental period (EE). Twelve frequency responders (Responders) had an average reduction of 88% at EE compared to BL. Three patients (Med Changes) who had a frequency response of >50%, but changed preventive medication dose or type, including prednisone, verapamil, and quetiapine, were excluded as responders. Thirteen were frequency non-responders (Non-responders). Overall, mean CH attack frequency was reduced by 4.9 CH attacks/week, or 31% (p = 0.005).