Aerosol deposition in neonatal ventilation

Area of Science:

• Neonatal respiratory care
• Pulmonary drug delivery
• Medical device engineering

Background:

• Lung deposition of inhaled drugs in ventilated neonates is crucial but challenging.
• Conventional nebulizers show limited pulmonary deposition (around 1%) in neonatal models.
• Previous models may lack relevance for assessing neonatal aerosol delivery.

Purpose of the Study:

• To evaluate and compare lung delivery efficiency of aerosols in a neonatal ventilation model.
• To assess a conventional jet nebulizer against novel electronic micropump nebulizers (continuous and synchronized).

Main Methods:

• Aerosol deposition studies using 99mTc-DTPA in four ventilated macaques.
• Comparison of MistyNeb (jet nebulizer) with Aeroneb Professional Nebulizer Continuous (APN-C) and Synchronized (APN-S).
• Radioactivity measurement in lungs, connections, and nebulizer using a gamma counter.

Main Results:

• Both APN-S (14.0%) and APN-C (12.6%) demonstrated significantly higher lung deposition than MistyNeb (0.5%).
• Delivery duration was shorter with APN-C (2 min) compared to APN-S (6 min) and MistyNeb (10 min).
• Despite similar aerosol presence in the circuit, electronic nebulizers offered superior lung delivery.

Conclusions:

• Electronic micropump nebulizers (APN-S and APN-C) are more efficient for aerosol administration in ventilated neonates.
• These devices offer improved lung drug delivery compared to conventional jet nebulizers.
• Aerogen's electronic micropump nebulizers present new opportunities for studying aerosol therapy in neonates.