Douglas Lea

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A portable peak flow meter based on a turbine transducer that can display results in code has been developed. Its performance compares well with the Wright peak flow meter. Records of subjective self assessment of asthma on a visual analogue scale and of peak flow (PEF) were compared in 12 subjects with asthma. PEF measurements were made with a coded meter(More)
A portable electronic spirometer giving peak expiratory flow rate has been developed and used successfully in studies of asthma. A turbine flow transducer produces a pulsed output whose frequency is proportional to flow. The output was coded to keep the results 'blind' to the patient. The code is suitable for use on other electronic instruments employing a(More)
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