Exhalation may be passive and non-controlled. The following illustrates a patient making the common mistake of inhaling too rapidly. Also, not inhaling a sufficiently large breath, and not breath holding for an adequate time. The following illustrates a patient inhaling at the proper flow rate, but not inhaling the desired deep breath, or breath holding long enough. The following illustrates proper MDI use.
Inspiratory flow is linear and maintained at the proper flow rate.
The inspired breath is to the programmed full capacity, and the breath hold time is to the desired interval.