The effect of heliox on nebulizer function using a beta-agonist bronchodilator

Area of Science:

• Respiratory Medicine
• Pharmacology
• Biomedical Engineering

Background:

• Heliox, a mixture of helium and oxygen, is used in respiratory care to reduce work of breathing.
• Nebulizers are devices used to deliver aerosolized medications, commonly used for respiratory conditions.
• The performance of nebulizers, particularly the mass and particle size of delivered medication, can be influenced by the driving gas used.

Purpose of the Study:

• To evaluate the impact of using heliox as a driving gas on nebulizer performance.
• To compare nebulizer performance with heliox versus air.
• To determine optimal conditions for heliox-powered nebulization.

Main Methods:

• Two nebulizer designs (conventional and continuous) were tested with albuterol.
• Nebulizers were powered by air and heliox at various flow rates and albuterol concentrations.
• Aerosol deposition was measured using a cotton plug, and particle size was analyzed with a cascade impactor.

Main Results:

• Heliox significantly decreased inhaled albuterol mass and altered particle size compared to air (p < 0.001).
• The reduction in inhaled mass was less with a conventional nebulizer (16%) than a continuous one (67%).
• Increasing heliox flow improved particle size and inhaled mass, approaching levels seen with air, while higher albuterol concentration maintained smaller particle size.

Conclusions:

• Heliox significantly affects inhaled medication mass and aerosol particle size during nebulization.
• Increased gas flow is recommended when using heliox to power nebulizers to optimize drug delivery.
• Nebulizer design influences the extent of performance changes when using heliox.