PRESSURIZED METERED DOSE INHALER Meaning and
Definition
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A pressurized metered dose inhaler (pMDI) refers to a medical device used to deliver medication directly into the lungs of individuals suffering from respiratory conditions such as asthma or chronic obstructive pulmonary disease (COPD). It consists of a small canister holding a specific quantity of medication in a liquid or suspension form, a metering valve, and a propellant propelling the medication out of the canister upon activation.
To use a pMDI, the user must actuate or press the inhaler, releasing a measured dose of medication in the form of a fine aerosol mist. A propellant within the canister helps disperse the drug particles, enabling them to be inhaled deeply into the lungs. This allows for efficient drug absorption into the respiratory system for maximum therapeutic benefit.
The technique of using a pMDI involves coordinating inhalation with the actuation of the device to ensure proper drug delivery. To enhance medication deposition within the lungs, a valve in the inhaler prevents the medication from being released when not in use. Some pMDIs incorporate a dose counter that displays the number of doses remaining, aiding in patient adherence and tracking medication usage.
Pressurized metered dose inhalers have been a significant advancement in respiratory medication delivery due to their convenience, portability, and ease of use. They have become a primary method for the administration of numerous respiratory medications and have greatly improved the management of respiratory diseases by providing fast-acting relief and long-term control of symptoms.
