{'fraction_non_alphanumeric': 0.02096177558569667, 'fraction_numerical': 0.014796547472256474, 'mean_word_length': 5.105263157894737, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Effect of Platelet Activating Factor on the Human Nasal Mucosa

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 μg 2.6 μg and 26 μg 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.