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 ?
that there is a significant variation in peak expiratory flow rate between morning and evening in population.
Prediction of asthma episodes in children using peak expiratory flow rates, medication compliance and exercise data.
However, research has indicated a high degree of variability when comparing symptom perceptions of the child with pulmonary function measures and peak expiratory flow rate.
05: Significant, FVC: Forced vital capacity, FEV1: Forced expiratory volume in one second, PEFR: Peak expiratory flow rate, SD: Standard deviation
In the present study, we observed lower values of peak expiratory flow rate and forced expiratory flow rates ([FEF.
The study group had higher mean of percentage value of forced vital capacity (FVC), forced expiratory volume in the first second (FEV1), maximum voluntary ventilation (MVV), and peak expiratory flow rate (PEFR) than controls.
Respiratory parameters--Forced vital capacity (FVC), forced expiratory volume at one second (FEV1), breath holding time (BHT), and peak expiratory flow rate (PEFR).
Before undertaking the exercise regimen blood hemoglobin concentration, Respiratory Minute Volume (RMV), Maximum Voluntary Ventilation (MVV), Forced Vital Capacity (FVC), Forced Expiratory Volume (FEV1), Peak Expiratory Flow Rate (PEFR), Respiratory Rate (RR), Heart Rate (HR) and Blood Pressure (BP) were determined in all the subjects as detailed below.
Assessing symptoms and peak expiratory flow rate as predictors of asthma exacerbations.
Berger's poster noted that both zileuton patient groups experienced improvement in trough FEV(1) and peak expiratory flow rate (PEFR) compared with placebo.
1]), maximum mid-expiratory flow rate, peak expiratory flow rate, and maximum voluntary ventilation were significantly reduced in scoliosis patients than controls, and they were inversely correlated with Cobb's angle.
Most of the studies evaluated short-term exposure effects of formaldehyde whereas studies regarding cognition and neuromuscular response functions were found to be scarce; hence we decided to evaluate peak expiratory flow rate (PEFR) and auditory and visual reaction time (RT) in technicians and attendants working in these labs.