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Boy breathing out through peak flow meter

Boy breathing out through peak flow meter

M825/0373

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Credit

MARK CLARKE / SCIENCE PHOTO LIBRARY MARK CLARKE / SCIENCE PHOTO LIBRARY

Caption

Lung function test. A boy breathes out through a peak flow meter, a device used to monitor breathing in asthmatics. The peak flow meter measures the maximum rate that air can flow out of the lungs. The patient first zeros the black notch on the calibrated scale, takes a deep breath, and then breathes out as hard as possible through the tube. The black notch slides down the scale, giving a reading in litres of air per min- ute. Asthma causes constriction of airways in the lungs (bronchospasm), making breathing difficult. The peak flow meter measures the severity of bron- chospasm and monitors the patient's response to bronchodilator drugs.

Release details

Model release not available. Property release not required.

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