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Therapeutic aerosol delivery during mechanical ventilation
D M Coleman1, H W Kelly, B C McWilliams
1Department of Pediatrics, University of New Mexico Health Sciences Center, Albuquerque 87131, USA.
The Annals of Pharmacotherapy
|June 1, 1996
Summary
Aerosol drug delivery during mechanical ventilation is challenging. Both metered-dose inhalers and jet nebulizers show similar efficiency (5-15%), requiring careful technique for optimal patient dosing.
Area of Science:
- Respiratory Medicine
- Pharmacology
- Biomedical Engineering
Background:
- Aerosol drug delivery to mechanically ventilated patients presents significant challenges.
- Factors influencing delivery efficiency include device type, ventilator settings, and circuit interface.
Purpose of the Study:
- To review and summarize existing literature on aerosol drug delivery during mechanical ventilation.
- To identify key variables affecting aerosol delivery efficiency in pediatric and adult populations.
Main Methods:
- A comprehensive MEDLINE search (1984-July 1994) identified relevant published articles and abstracts.
- All retrieved studies, including in vivo, in vitro, reviews, and case reports, were reviewed without exclusion criteria.
- Data on percent drug delivery and influencing factors were extracted and tabulated.
Main Results:
- Delivery efficiency is influenced by endotracheal tube diameter, ventilator circuitry, ventilator type and modes, and delivery device operation.
- The behavior of aerosolized drugs can vary significantly between different delivery systems.
- Optimal positioning and operation of the delivery device within the ventilator circuit are crucial.
Conclusions:
- Metered-dose inhalers with large-volume adapters and jet nebulizers demonstrate comparable efficiency (5-15%) for aerosol delivery.
- Attention to detail in device selection, placement, and operation is essential for maximizing drug delivery.
- Close monitoring of patient outcomes is recommended for optimizing bronchodilator dosing schedules.