Which of the following changes in the characteristics of wheezing indicate improvement in air-way obstruction following bronchodilator therapy?
a. Lower pitch, shorter duration
b. Higher pitch, shorter duration
c. Lower pitch, longer duration
d. Higher pitch, longer duration
ANS: A
It is useful to monitor the pitch and duration of wheezing. Improved expiratory flow is associat-ed with a decrease in the pitch and length of the wheezing. For example, if high-pitched wheez-ing is present during the entire expiratory time before treatment but becomes lower pitched and occurs only late in exhalation after therapy, the pitch and duration of the wheeze have dimin-ished. This suggests that the degree of airway obstruction has decreased.
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