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[Technical and experimental study of two electronic spirometers (author's transl)].

C Duvivier, A B Bohadana, R Peslin

    Bulletin Europeen De Physiopathologie Respiratoire
    |September 1, 1977
    PubMed
    Summary

    This study evaluated two spirometers, Pneumoscreen and Medistor M 010. Pneumoscreen showed good linearity but overestimated low-volume flow, while Medistor had poor linearity and frequency response, with bias in peak flow measurements.

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    Area of Science:

    • Pulmonary Function Testing
    • Medical Device Evaluation
    • Respiratory Diagnostics

    Background:

    • Spirometry is crucial for diagnosing and monitoring respiratory diseases.
    • Accurate electronic spirometers are needed for reliable pulmonary function testing.
    • Evaluating the performance of new spirometry devices is essential.

    Purpose of the Study:

    • To assess the static and dynamic response of two electronic spirometers: Pneumoscreen and Medistor type M 010.
    • To clinically compare these devices against a reference flow channel in human subjects.
    • To identify potential systematic errors and biases in their measurements.

    Main Methods:

    • Evaluation of static and dynamic response using standard pneumotachographs.
    • Clinical comparison in 20 subjects against a reference flow channel.

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  • Analysis of linearity, frequency response, and systematic errors in digital and analog processing.

    • Main Results:

    • Pneumoscreen demonstrated adequate linearity and frequency response but overestimated maximum flow at low lung volumes due to digital processing errors.
    • Medistor type M 010 exhibited poor linearity and inadequate frequency response, with systematic bias found in peak flow and maximum breathing capacity measurements.
    • Forced vital capacity measurements were generally reliable for both devices, with Pneumoscreen providing direct read-outs of key forced expiration indexes.

    Conclusions:

    • Pneumoscreen is largely adequate for spirometry but requires correction for overestimation of low-volume flow.
    • Medistor type M 010's performance limitations, particularly in linearity and frequency response, raise concerns for its clinical use in peak flow and maximum breathing capacity.
    • Further validation and potential modifications are suggested for these electronic spirometers to ensure accurate pulmonary function testing.