title: Deposition pattern from a nasal pump spray.
abstract: The initial distribution and subsequent clearance of aerosol from a hand-operated nasal pump spray has been assessed from gamma camera scans in ten normal subjects, following labelling of placebo sprays with 99Tcm labelled Teflon particles (mean diameter 2 micron). Aerosol was concentrated chiefly in the anterior part of the nose, but the area of deposition varied between subjects. No particles reached the lungs. A mean 56% of the dose was retained at the initial site of deposition 30 minutes after administration, while the remaining 44% of the dose had cleared to the nasopharynx. The initial partitioning of nasal pump sprays between ciliated and non-ciliated zones is relevant both for effective topical therapy of the nasal cavity, and for possible systemic drug delivery by the intranasal route.
mesh_terms: D000281:Administration, Intranasal; D000328:Adult; D000336:Aerosols; D019819:Budesonide; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009297:Nasal Mucosa / Q000187:drug effects*; D011282:Pregnenediones / Q000008:administration & dosage*
chemical_list: D000336:Aerosols; D011282:Pregnenediones; D019819:Budesonide