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Fractional deposition from a jet nebulizer: How it differs from a metered dose inhaler

https://doi.org/10.1016/0007-0971(85)90069-5Get rights and content

Abstract

The fractional deposition from an Inspiron ‘Mini-Neb’ jet nebulizer was assessed in six normal and two asthmatic subjects using technetium-99m-labelled milli-microspheres of human serum albumin suspended in saline. Sixty-six per cent of activity was retained in the apparatus tubing, 20% exhaled, 2% deposited in the mouth and 12% was retained in the lungs. The nebulizer fractional deposition therefore differs from the findings reported for a metered dose inhaler (Newman et al. 1981; Spiro et al. 1984), where 80–85% of particles leaving the cannister deposits in the mouth, and only 5–10% in the apparatus. The lung fraction from a nebulizer is, however, similar to the 9–11% from an MDI.

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