Which of the following statements regarding the metered-dose inhaler (MDI) is correct?
Choose one answer.
A. Shaking an MDI prior to use will cause deactivation of the medication.
B. MDIs are most commonly used by patients with cardiovascular disease.
C. MDIs are contraindicated for patients with asthma or emphysema.
D. An MDI delivers the same amount of medication every time it is used.