Which of the following techniques will increase aerosol deposition by sedimentation in the lungs?
a. High inspiratory flow
b. Short inspiratory time
c. 10-sec breath-hold
d. Short expiratory time
ANS: C
A 10-sec breath-hold can increase aerosol deposition as much as 10% and increase the ratio of aerosol deposited in lung parenchyma to central airway by four-fold.
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