Table 1 Characteristics of voltage tuning in patients with CH
From: Occipital nerve stimulation for cluster headache: lessons to learn from the ‘voltage tuners’
Patient | Responder to the ONS therapy | Age (y) | Gender | Time to response | Duration | Frequency | Moment of day | Increase in amplitude | Follow up period | |
|---|---|---|---|---|---|---|---|---|---|---|
Group 1 (0% improvement) | ||||||||||
1 | 53 | M | N/A | N/A | N/A | Variable | N/A | 38 m | ||
Group 2 (1–49% improvement) | ||||||||||
2 | 48 | V | < 15 m | 60 m | 3 times/d | Evening, night | 43% (1.4 mA to 2.0 mA) | 17 m | ||
3 | 55 | M | < 5 m | 60 m | 2 times/m | Variable | 20% (5 V to 6 V) | 27 m | ||
4 | 31 | V | N/A | N/A | N/A | Variable | 25% (2.4 to 3.0 V) | 35 m | ||
5 | 40 | M | < 60 m | ≥ 24 h | 1 time/m | Entire day | 360% (1.0 V to 4.6 V) | 37 m | ||
6 | 46 | M | N/A | N/A | N/A | Variable | N/A | 6 m | ||
Group 3 (50–99% improvement) | ||||||||||
71 | 45 | V | < 5 m | 30 m | 3 times/m | Evening, afternoon | 21% (1.65 V to 2 V) | 38 m | ||
8 | 29 | M | < 15 m | ≥ 24 h | 2 times/m | Variable | 60% (5 V to 8 V) | 42 m | ||
9 | 35 | V | < 20 m | 150 m | 2 times/m | Variable | 275% (1.6 V to 6 V) | 29 m | ||
10 | 22 | M | < 20 m | ≥ 24 h | 2 times/m | Variable | 25% (6 V to 7.5 V) | 22 m | ||
11 | 55 | V | < 10 m | 20–90 m | 2 times/w | Evening, night | 194% (0.85 V to 2.5) | 32 m | ||
12 | 45 | M | < 15 m | 60 m–12 h | 5 times/w | Variable | 122% (1.8 V to 4 V) | 14 m | ||
13 | 27 | V | < 45 m | 120 m | N/A | Variable | 28% (1.8 V to 2.3 V) | 12 m | ||
14 | 33 | M | < 30 m | 30 m | 4–5 times/w | Entire day | 50% (2.0 V to 3.0 V) | 35 m | ||
15 | 33 | V | < 10 m | 20 m | 2 times/m | Variable | 20% (4.0 mA to 4.8 mA) | 6 m | ||
Group 4 (100% improvement) | ||||||||||
16 | 27 | M | < 120 m | 48 h | 2 periods/y | Entire day | 49% (2.25 V to 3.35 V) | 38 m | ||