peak expiratory flow rate


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peak expiratory flow rate

Maximum expiratory flow, peak flow The greatest rate of airflow that can be obtained during forced exhalation, which follows a diurnal pattern of fluctuation and can be used clinically to evaluate airway tone; PEF is ↓–and airway tone ↑ in various forms of asthma; it can be plotted during the day and used to investigate occupational asthma and detect exacerbation before the onset of Sx. See Pulmonary function tests.

peak ex·pi·ra·to·ry flow rate

(PEFR) (pēk ek-spīr'ă-tōr-ē flō rāt)
The maximum flow at the outset of forced expiration, which is reduced in proportion to the severity of airway obstruction, as in asthma.

peak expiratory flow rate

The maximum rate of exhalation during a forced expiration, measured in liters per second or liters per minute. It is used as a test of airway obstruction.
See also: rate

peak expiratory flow rate (pēkˑ ek·spīˑ·r·tōrˈ·ē flōˑ rātˑ),

n a simple, preliminary test that measures the maximum volume of air exhaled by the patient to assess degree of respiratory restriction.
References in periodicals archive ?
Jones AYM, Hutchinson RC, Lin E, Oh TE (1992a) Peak expiratory flow rates produced with the Laerdal and Mapleson C circuits.
Acute effects of low levels of ambient ozone on peak expiratory flow rate in a cohort of Australian children.
Use of peak expiratory flow rate in emergency department evaluation of acute exacerbation of chronic obstructive pulmonary disease.
The association of ambient air pollution with twice daily peak expiratory flow rate measurements in children.
The improvement in pulmonary function produced by Foradil was associated with a reduction in daily symptoms, less use of rescue medication and fewer 'bad days' - defined as days where patients scored two or more on at least two of the marked individual symptoms and/or had a reduction in the peak expiratory flow rate from baseline of more than 20 per cent.
Pulmonary function was measured using the variables of FEV1 and peak expiratory flow rate (PEFR) at multiple time points over the first hour then hourly to 360 minutes after dosing.