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SPECT-CT Comparison of Lung Deposition using a System combining a Vibrating-mesh Nebulizer with a Valved Holding Chamber and a Conventional Jet Nebulizer: a Randomized Cross-over Study

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Abstract

Purpose

To compare in vivo the total and regional pulmonary deposition of aerosol particles generated by a new system combining a vibrating-mesh nebulizer with a specific valved holding chamber and constant-output jet nebulizer connected to a corrugated tube.

Methods

Cross-over study comparing aerosol delivery to the lungs using two nebulizers in 6 healthy male subjects: a vibrating-mesh nebulizer combined with a valved holding chamber (Aerogen Ultra®, Aerogen Ltd., Galway, Ireland) and a jet nebulizer connected to a corrugated tube (Opti-Mist Plus Nebulizer®, ConvaTec, Bridgewater, NJ). Nebulizers were filled with diethylenetriaminepentaacetic acid labelled with technetium-99 m (99mTc-DTPA, 2 mCi/4 mL). Pulmonary deposition of 99mTc-DTPA was measured by single-photon emission computed tomography combined with a low dose CT-scan (SPECT-CT).

Results

Pulmonary aerosol deposition from SPECT-CT analysis was six times increased with the vibrating-mesh nebulizer as compared to the jet nebulizer (34.1 ± 6.0% versus 5.2 ± 1.1%, p < 0.001). However, aerosol penetration expressed as the three-dimensional normalized ratio of the outer and the inner regions of the lungs was similar between both nebulizers.

Conclusions

This study demonstrated the high superiority of the new system combining a vibrating-mesh nebulizer with a valved holding chamber to deliver nebulized particles into the lungs as comparted to a constant-output jet nebulizer with a corrugated tube.

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Abbreviations

99mTc-DTPA:

Diethylenetriaminepentaacetic acid labelled with technetium-99 m

AP:

Anteroposterior planar image

JN:

Jet nebulizer with a corrugated tube

PA:

Posteroanterior planar image

ROI:

Region of interest

SPECT-CT:

Single-photon emission computed tomography combined with a CT scan

VN-C:

Vibrating-mesh nebulizer combined with a specific valved holding chamber

VOI:

Volume of interest

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ACKNOWLEDGEMENTS AND DISCLOSURE

This study was funded by an unrestricted grand by Aerogen Ltd. (Galway, Ireland)

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Authors

Corresponding author

Correspondence to Jonathan Dugernier.

Additional information

ClinicalTrial registration

NCT02298101

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Figure S1

Bland Altman plot illustrating the agreement between the two imaging techniques (SPECT-CT vs Planar) used to assess the lung deposition fraction obtained with the vibrating-mesh nebulizer combined with a specific valved holding chamber (orange) and the jet nebulizer (blue). Although the differences of lung deposition between both techniques increased with lung deposition measurements (higher differences with the vibrating-mesh nebulizer combined with a specific inhalation chamber than with the jet nebulizer), most but two values of lung deposition remain in both limits of agreement from −3.79 to 2.89 (dotted lines) with a mean bias of −0.45 (solid line). (GIF 183 kb)

High resolution image (TIF 104 kb)

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Dugernier, J., Hesse, M., Vanbever, R. et al. SPECT-CT Comparison of Lung Deposition using a System combining a Vibrating-mesh Nebulizer with a Valved Holding Chamber and a Conventional Jet Nebulizer: a Randomized Cross-over Study. Pharm Res 34, 290–300 (2017). https://doi.org/10.1007/s11095-016-2061-7

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  • DOI: https://doi.org/10.1007/s11095-016-2061-7

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