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Related Experiment Videos

Deposition pattern from a nasal pump spray.

S P Newman, F Morén, S W Clarke

    Rhinology
    |June 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Nasal pump sprays primarily deposit in the anterior nose, with no lung penetration observed. Most of the dose clears to the nasopharynx within 30 minutes, impacting topical and systemic drug delivery potential.

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    Area of Science:

    • Pharmacology and Pharmaceutical Sciences
    • Medical Imaging and Radiology

    Background:

    • Nasal drug delivery offers potential for both local and systemic therapeutic effects.
    • Understanding aerosol deposition patterns is crucial for optimizing nasal spray efficacy.

    Purpose of the Study:

    • To investigate the initial distribution and subsequent clearance of aerosolized particles from a hand-operated nasal pump spray.
    • To assess the variability in aerosol deposition across different subjects.

    Main Methods:

    • Ten healthy volunteers received placebo nasal sprays labeled with 99mTc-labeled Teflon particles (2-micron diameter).
    • Gamma camera imaging was used to track aerosol distribution and clearance over time.

    Main Results:

    • Aerosol deposition was concentrated mainly in the anterior nasal region, with significant inter-subject variability.

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  • No detectable particles reached the lungs.
  • Within 30 minutes, 56% of the dose remained at the deposition site, while 44% cleared to the nasopharynx.

    • Conclusions:

    • The initial deposition pattern of nasal pump sprays influences topical nasal cavity therapy.
    • Understanding clearance to the nasopharynx is key for evaluating potential systemic drug delivery via the intranasal route.