Which of the following values is not measured directly?
a. FEV1 c. Peak expiratory flows
b. Airway resistance (Raw) d. Maximum inspira-tory pressure
ANS: B
FEV1 and peak expiratory flows are routine measurements during spirometry. Maximum inspira-tory pressure is a common airway pressure measurement made on spontaneously breathing pa-tients. Raw is calculated by subtracting plateau pressure (Pplateau) from peak inspiratory pressure and dividing the resultant pressure by the airflow.
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