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  • Title: The blink reflex in chronic tension-type headache, migraine, and cervicogenic headache.
    Author: Sand T, Zwart JA.
    Journal: Cephalalgia; 1994 Dec; 14(6):447-50; discussion 394-5. PubMed ID: 7697706.
    Abstract:
    R1 and R2 blink reflex latencies were investigated blind in 10 patients with cervicogenic headache, 11 patients with chronic tension-type headache, 11 patients with migraine, and 9 headache-free controls. There were no R1 or R2 latency differences between the four groups. The latency of R1 increased significantly with headache duration in tension-type headache patients. Shorter R1 latencies were found on the symptomatic side than on the non-symptomatic side in cervicogenic headache patients. The results suggest that a state of hyperactivity may be present in the ipsilateral trigeminal nucleus in cervicogenic headache. Hypoactivity, however, may develop over time in tension-type headache.
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