Measurement of peak Expiratory flow rate(PEFR) is the simplest and most basic test.
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Very severe airflow obstruction- forced Expiratory volume in one second(FEV1) less than 30% predicted.
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The amount of air you can blow out in one second-
called forced Expiratory volume in one second(FEV1).
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Airway inflammation is increased during the
exacerbation resulting in increased hyperinflation, reduced Expiratory air flow and decreased gas exchange.
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The presence of Expiratory phase wheezing signifies that the patient's peak
Expiratory flow rate is less than 50% of normal.
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The test person exhales the air with force in a special device-
a spirometer that measures the maximum Expiratory rate.
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The main measure of effectiveness
was based on changes in patients' forced Expiratory volumes(FEV1, the maximum volume of air a person
can breathe out in one second) after six months.