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[Are automatic devices suitable for blood pressure determinations?].

C Adorjani, W Siegenthaler, W Vetter

    Schweizerische Medizinische Wochenschrift
    |September 1, 1979
    PubMed
    Summary
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    Four automatic blood pressure monitors were compared to a manual device. While generally accurate for systolic and diastolic readings, automatic devices often yielded lower diastolic values, with specific guidance for the Physiometrics SR-2 model.

    Area of Science:

    • Cardiovascular research
    • Medical device evaluation
    • Hypertension management

    Context:

    • Accurate blood pressure monitoring is crucial for diagnosing and managing hypertension.
    • Traditional auscultatory methods using sphygmomanometers are the gold standard but can be subject to observer variability.
    • The increasing availability of automated oscillometric devices necessitates their validation against established methods.

    Purpose:

    • To compare the accuracy of four automatic blood pressure recorders (Bosograph II, Bosch EBM 500, Elag BE 237R, and Physiometrics SR-2) against a random zero sphygmomanometer.
    • To assess the correlation between systolic and diastolic blood pressure readings obtained from automatic devices and the gold standard.
    • To evaluate the reliability of diastolic measurements, particularly the two possible readings from the Physiometrics SR-2.

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    Summary:

    • Readings from four automatic blood pressure monitors correlated well with a random zero sphygmomanometer across a broad range of systolic and diastolic pressures (r = 0.878–0.982).
    • Automatic devices generally recorded lower diastolic blood pressure values compared to the random zero device.
    • The Physiometrics SR-2's second diastolic reading was significantly lower and deemed unreliable; only the higher diastolic value should be considered.

    Impact:

    • The study validates the suitability of the tested automatic blood pressure recorders for clinical use.
    • It highlights the need for careful interpretation of diastolic readings from certain automatic devices, specifically the Physiometrics SR-2.
    • Findings support the use of automated devices in hypertension research and clinical practice, with awareness of potential systematic differences in diastolic measurements.