. Nurse supervising an asthmatic woman patient in using a peak flow meter, a device used to measure respiratory capacity. The peak flow meter measures the maximum flow of air exhaled from the lung, expressed in litres per minute. A typical range is from 50 to 750 litres per minute. The difficulties in breathing experienced by asthmatics are due to sustained attacks of bronchospasm, a narrowing of the bronchi, the air passages of the lungs. MODEL RELEASED

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