Which of the following is used to measure the resistance to small airways
Correct Answer: Max. mid respiratory flow rates.
Description: Ans. is 'c' i.e Max. Mid expiratory flow rates. * The following lines from Harrison support the answer.In obstructive lung disease, the hallmark is a decrease in expiratory flow rates. With fully established disease, the ratio of FEV1/FVC in decreased, as is the FEF25-75 %'( Max. mid expiratory flow rate).With early obstructive disease, which originates in the small airways, FEV1/FVC may be normal, the only abnormalities noted on routine testing of pulmonary function may be a depression in FEF25-75% and an abnormal configuration in the terminal portion of the forced expiratory flow-volume curve. "
Category:
Physiology
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