title: Effect of platelet activating factor on the human nasal mucosa.
abstract: In order to determine the effect of PAF-acether on the vascular bed in the human nose, 11 healthy volunteers were studied. Rhinomanometry was performed to determine the effect on the capacitance vessels, and the 133Xe wash-out method enabled determination of the mucosal blood flow, regulated mainly by the resistance vessels. These measurements were made before and after topical administration of PAF-acether in three different doses; 0.26 micrograms, 2.6 micrograms and 26 micrograms per nostril. The results indicate that PAF-acether induces a dose-dependent vasoconstriction of the capacitance vessels and a reduction in mucosal blood flow. That PAF-acether should be a principal mediator in the allergic reaction in the human nose is not supported by these findings.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009297:Nasal Mucosa / Q000187:drug effects*; D009299:Nasal Provocation Tests; D010972:Platelet Activating Factor / Q000494:pharmacology*; D012882:Skin Tests
chemical_list: D010972:Platelet Activating Factor