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Table 1 Characteristics of the 11 patients before implantation

From: Safety and efficacy of deep brain stimulation in refractory cluster headache: a randomized placebo-controlled double-blind trial followed by a 1-year open extension

Center/patient no. Group Sex Age (years) Disease duration (years) Attack side Onset clinical form Attacks/week Pain intensity Sumatriptan injection/week Oxygen use
C1/P1 On/Off M 52 35 Left Episodic 14 9 1 No
C1/P2 Off/On M 40 12 Right Chronic 14 5 14 No
C1/P3 Off/On M 51 8 Left Episodic 19 2 15 No
C1/P4 On/Off M 44 10 Left Chronic 28 10 0 No
C1/P5 On/Off M 47 7 Right Chronic 11 6 11 No
C2/P1 Off/On M 50 20 Right Episodic 20 5 0 No
C2/P2 Off/On F 42 3 Left Chronic 7 8 1 Yes
C3/P1 On/Off F 42 7 Right Episodic 53 6.5 0 Yes
C3/P2 Off/On M 36 7 Left Chronic 9 5 11 No
C4/P1 Off/On M 39 18 Right Episodic 14 5 14 No
C4/P2 On/Off F 43 6 Right Chronic 7 7 1 Yes
Mean    44.1 12.1    17.8 6.1 6.2  
  1. Some patients did not use attack treatment by sumatriptan and/or oxygen due to their lack of efficacy or side effects (such patients used opioids with weak efficacy)