Four patients in the migraine group (4, 10.5 % unilateral; 0, 0 % bilateral), seven patients in the TTH group (7, 23.3 % unilateral; 0, 0 % bilateral) and four patients (3, 6.0 % unilateral; 1, 2.0 % bilateral) in the control group showed absent cVEMP responses. There was no statistically significant difference among the groups with respect to cVEMP response rate (Table 2). Illustrated examples of rectified cVEMP tracings in controls and patients with migraine are shown in Fig. 1. Additionally, p13 and n23 latencies and rectified amplitudes of cVEMP in migraine without aura and TTH patients did not differ significantly from those of healthy controls (Table 4). Moreover, no significant difference was observed in the amplitude AR or interaural latency differences of cVEMP.
Table 4 Rectified cVEMP results of headache patients and controls
Parameters TTH Migraine Controls  P value
Left side
latency p13 (ms) 12.78 ± 1.37 13.57 ± 2.37 12.84 ± 1.81 NS
latency n23 (ms) 20.82 ± 2.01 21.98 ± 3.01 21.32 ± 2.06 NS
p13 rectified amp (μV) 42.43 ± 19.10 38.61 ± 24.95 39.41 ± 21.81 NS
n23 rectified amp (μV) 53.22 ± 13.90 58.52 ± 37.73 50.95 ± 34.25 NS
Right side
latency p13 (ms) 12.89 ± 2.45 13.68 ± 2.16 13.01 ± 2.00 NS
latency n23 (ms) 21.06 ± 2.17 22.09 ± 3.10 21.56 ± 2.29 NS
p13 rectified amp (μV) 38.97 ± 21.05 34.49 ± 23.40 41.79 ± 25.55 NS
n23 rectified amp (μV) 49.98 ± 15.70 46.38 ± 28.37 57.79 ± 39.72 NS
Values are expressed as the means ± standard deviation
TTH tension-type headache, cVEMP cervical vestibular evoked myogenic potential, amp amplitude, NS non-significant