In Vitro Comparison of Inspiration-Synchronized and Continuous Vibrating Mesh Nebulizer During Adult Invasive...

Area of Science:

• Respiratory Medicine
• Medical Devices
• Pharmacology

Background:

• Optimizing aerosol delivery during invasive mechanical ventilation is crucial for effective drug therapy.
• Inspiration-synchronized nebulization offers a potential improvement over continuous nebulization modes.
• Vibrating mesh nebulizers (VMNs) are widely used for aerosol drug delivery.

Purpose of the Study:

• To compare aerosol delivery of albuterol using a prototype inspiration-synchronized vibrating mesh nebulizer (VMN) versus a continuous VMN.
• To evaluate the impact of nebulizer position on aerosol delivery efficiency.
• To assess the effect of particle size generated by VMNs on inhaled drug dose.

Main Methods:

• A critical care ventilator system was used with an endotracheal tube (ETT), collection filter, and test lung.
• Albuterol delivery was tested using conventional (Solo) and prototype small-particle VMNs in both continuous and inspiration-synchronized modes.
• Nebulizers were placed at different positions: humidifier inlet, Y-piece, and between Y-piece and ETT. Drug dose was measured via UV spectrophotometry.

Main Results:

• Inspiration-synchronized nebulization increased the inhaled albuterol dose by 1.4 to 3.6 times compared to continuous mode, irrespective of nebulizer position (p < 0.001).
• The small-particle VMN delivered 8%-69% more inhaled drug than the conventional VMN (Solo) across all conditions (p < 0.001).
• Highest delivery for inspiration-synchronized VMN was achieved near the ETT (50%-60%), while continuous VMN performed best near the humidifier (21%-37%).

Conclusions:

• Inspiration-synchronized VMNs significantly enhance albuterol delivery during invasive mechanical ventilation compared to continuous VMNs.
• Prototype small-particle VMNs improve inhaled drug dose delivery over conventional VMNs.
• Optimal nebulizer placement is critical: inspiration-synchronized VMNs perform best near the ETT, while continuous VMNs are more effective near the ventilator's humidifier.