MDI stands for which medical device?

• A. Nebulizer
• B. Metered Dose Inhaler
• C. Nasal Cannula
• D. Non-Rebreather

Answer: (B)

MDI refers to a device that delivers a fixed, metered amount of medication directly to the lungs with each puff. With a metered-dose inhaler, you press the canister to release a specific dose of aerosol, which you inhale through the mouth. This is used for inhaled bronchodilators and steroids in conditions like asthma and COPD, and it often works best with a spacer to improve delivery.

This is different from a nebulizer, which converts liquid medication into a mist over several minutes and is often used with a mask or mouthpiece without a precise dose per puff. It’s also different from a nasal cannula and a non-rebreather mask, both of which deliver oxygen (and not a measured inhaled medication) through the nose or a mask.