Teaching Points for administration of the new HFA MDI:
- HFA inhalers require multiple priming sprays, periodic cleaning of the actuator boot, and longer agitation prior to first use and when unused for a number of days. Refer to the package insert with each individual MDI for specific recommendations.
- HFA inhalers have substantially less taste. Patients associated the bitter taste of CFC powered MDIs with effectiveness and the relief of symptoms.
- HFA inhalers create a lower plume velocity, which results in less oral and pharyngeal deposition. Patients associated the more vigorous spray of CFC powered MDIs with relief of symptoms and effectiveness.
- Metered Dose Inhaler (MDI): A small pressurized metal canister in a plastic actuator that releases a mist of medicine to inhale when pressed.
- Chlorofluorocarbon (CFC): A fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant.
- Hydroflouroalkane (HFA): The new alternative propellant created to replace CFCs, and the standard for MDIs starting in 2009.