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The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR) and peak flow measurement, [1] is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air.
MMEF or MEF stands for maximal (mid-)expiratory flow and is the peak of expiratory flow as taken from the flow-volume curve and measured in liters per second. It should theoretically be identical to peak expiratory flow (PEF), which is, however, generally measured by a peak flow meter and given in liters per minute. [16]
For example, maximum inspiratory flow is denoted FIF max. Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.) PEF: Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter: MVV
For example, maximum inspiratory flow is denoted FIF max. Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.) PEF: Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter: MVV
For example, maximum inspiratory flow is denoted FIF max. Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.) PEF: Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter: MVV
For example, maximum inspiratory flow is denoted FIF max. Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.) PEF: Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter: MVV
For example, maximum inspiratory flow is denoted FIF max. Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.) PEF: Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter: MVV
1959 Wright B. M. and McKerrow C. B. introduced the peak flow meter; 1969 DuBois A. B. and van de Woestijne K. P. experimented on humans using the whole body plethysmograph; 1974 Campbell et al. refined the previous peak flow meter, developing a cheaper and lighter version [2]
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