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Inhibition of the Blink Reflex R2 Component after Supraorbital and Index Finger Stimulations Is Reduced in Cluster Headache: An Indication for Both Segmental and Suprasegmental Dysfunction?
Lozza, A.; Schoenen, Jean; Delwaide, P. J.
1997In Pain, 71 (1), p. 81-8
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Keywords :
Blinking/physiology; Cluster Headache/physiopathology; Conditioning (Psychology)/drug effects; Electric Stimulation; Female; Fingers/innervation/physiology; Functional Laterality/physiology; Humans; Male; Naloxone/pharmacology; Narcotic Antagonists/pharmacology; Orbit/innervation/physiology
Abstract :
[en] Peripheral as well as central mechanisms are thought to play a role in cluster headache pathogenesis. We have studied recovery curves of the R2 component of the blink reflex after conditioning by supraorbital or index finger stimuli in 10 episodic cluster headache (CH) patients during a cluster period and in 10 healthy controls. There was no significant change of R2 threshold, latency or area in CH patients. After paired supraorbital stimuli, R2 recovered more rapidly in patients on the symptomatic side. After index stimulations, R2 recovery was more rapid on both symptomatic and non-symptomatic sides in patients compared to controls. Naloxone (0.4 mg) i.v. in two subjects partially reversed the R2 suppression induced by index finger stimuli. The unilateral decrease of R2 inhibition after a segmental supraorbital stimulus most likely reflects sensitisation in the spinal trigeminal nucleus. Whether the latter is due to irritation of the ophthalmic nerve within the cavernous sinus region, which is thought to be pivotal in CH pathogenesis, remains to be proven. In addition, we propose that the bilateral deficit of R2 inhibition after an extrasegmental exteroceptive stimulus might reflect hypoactivity of reticular nuclei, possibly because of reduced central opioid activity.
Disciplines :
Neurosciences & behavior
Neurology
Author, co-author :
Lozza, A.
Schoenen, Jean  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Neuro-anatomie
Delwaide, P. J.
Language :
English
Title :
Inhibition of the Blink Reflex R2 Component after Supraorbital and Index Finger Stimulations Is Reduced in Cluster Headache: An Indication for Both Segmental and Suprasegmental Dysfunction?
Publication date :
May 1997
Journal title :
Pain
ISSN :
0304-3959
eISSN :
1872-6623
Publisher :
Elsevier, Netherlands
Volume :
71
Issue :
1
Pages :
81-8
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 September 2009

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