Abstract:
:The role of prostanoids in nociception is well established. The headache eliciting effects of prostacyclin (prostaglandin I(2), (PGI(2))) and its possible mechanisms had previously not been systematically studied in man. We hypothesized that infusion of PGI(2) might induce headache and vasodilatation of cranial vessels. A stable analog of PGI(2) epoprostenol (10 ng/kg/min) was infused for 25 min into 12 healthy subjects in a cross-over, double-blind study. Headache intensity was scored on a verbal rating scale from 0 to 10. In addition, we recorded mean flow in the middle cerebral artery (V(mean MCA)) by the transcranial doppler and diameter of the superficial temporal artery (STA) by a high-resolution ultrasonography unit. During the immediate phase (0-30 min) and the post-infusion phase (30-90 min), 11 subjects reported headache on the PGI(2) day and no subjects reported headache on the placebo day (p=0.002). During epoprostenol (0-30 min) and in the post-infusion phase (30-90 min), the area under the curve (AUC) for headache score was significantly larger than during and after placebo (p=0.005). PGI(2) caused headache associated with the dilatation of STA (AUC, p<0.001), but no significant dilatation of the MCA (AUC, p=0.508). These data indicate that PGI(2) induced headache might be due to activation and sensitization of sensory afferents around extracranial arteries.
journal_name
Painjournal_title
Painauthors
Wienecke T,Olesen J,Oturai PS,Ashina Mdoi
10.1016/j.pain.2008.03.018subject
Has Abstractpub_date
2008-09-30 00:00:00pages
106-116issue
1eissn
0304-3959issn
1872-6623pii
00006396-200809300-00012journal_volume
139pub_type
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