Which inhalation technique is correct for using an MDI?

The correct inhalation technique for using a Metered-Dose Inhaler (MDI) is characterized by a slow inhalation at a flow rate of approximately 30 liters per minute, continuing to a point of total lung capacity (TLC), followed by a breath hold.

Using a slow inhalation allows for better coordination with the actuation of the inhaler, ensuring that the medication is aerosolized effectively and reaches the deeper parts of the lungs. This technique helps to enhance drug deposition in the airways, maximizing the therapeutic effect of the medication.

After inhaling the medication, holding the breath allows particles to settle within the airways rather than being quickly exhaled. This breath-holding practice encourages deeper penetration of the medication and ensures prolonged contact with the airway surfaces, which is particularly beneficial for managing asthma or other respiratory conditions.

The other options do not promote effective drug delivery. Fast and shallow breathing can cause the inhaled medication to be deposited mainly in the upper airways, reducing its effectiveness. Normal tidal volume with occasional breath holding does not allow for adequate drug deposition in the lungs. Inhaling very quickly and exhaling immediately can lead to medication being exhaled before it has a chance to settle in the lungs, further decreasing