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Intensive Care Medicine

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01-07-2003 | Experimental

In vitro evaluation of aerosol bronchodilator delivery during mechanical ventilation: pressure-control vs. volume control ventilation

Authors: Dean R. Hess, Christine Dillman, Robert M. Kacmarek

Published in: Intensive Care Medicine | Issue 7/2003

Abstract

Objective

To determine the effect of inspiratory time and inspiratory flow pattern on albuterol delivery by aerosol during mechanical ventilation.

Design

A ventilator was connected to a lung model and set to deliver a tidal volume of 0.6 l, PEEP 5 cmH₂O, and respiratory rate of 15/min. We evaluated inspiratory times of 1 and 2 s, lung mechanics of 0.05 l/cmH₂O compliance and 50 cmH₂O/l/s resistance, or 0.02 l/cmH₂O compliance and 5 cmH₂O/l/s resistance, and three inspiratory flow patterns (constant flow volume-controlled ventilation, descending ramp flow volume-controlled ventilation, and pressure-controlled ventilation). Albuterol was delivered into the ventilator circuit by a nebulizer containing 5 mg (4 ml) albuterol or a pMDI and spacer (four actuations; 360 µg). A filter between the Y-piece and the lung model collected the aerosol, which was analyzed for albuterol by spectrophotometry.

Results

For the nebulizer there were significant differences in albuterol delivered for inspiratory time, flow pattern, and lung mechanics. For the pMDI there were no significant differences for the amount of albuterol delivered for inspiratory time, flow pattern, or lung mechanics.

Conclusions

Albuterol delivery by nebulizer is affected by inspiratory time and inspiratory flow pattern. When a pMDI is used, the amount of albuterol delivered is not affected by inspiratory flow pattern or inspiratory time.

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Title: In vitro evaluation of aerosol bronchodilator delivery during mechanical ventilation: pressure-control vs. volume control ventilation
Authors: Dean R. Hess
Christine Dillman
Robert M. Kacmarek
Publication date: 01-07-2003
Publisher: Springer-Verlag
Published in: Intensive Care Medicine / Issue 7/2003
Print ISSN: 0342-4642
Electronic ISSN: 1432-1238
DOI: https://doi.org/10.1007/s00134-003-1792-1

Keynote webinar | Spotlight on medication adherence

Springer Medicine

In vitro evaluation of aerosol bronchodilator delivery during mechanical ventilation: pressure-control vs. volume control ventilation

Abstract

Objective

Design

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objective

Design

Results

Conclusions

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