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Related Experiment Videos

Hidden errors of aneroid sphygmomanometers.

Jason J S Waugh1, Manesh Gupta, Julie Rushbrook

  • 1Department of Obstetrics and Gynaecology, Leicester-Warwick Medical School, Leicester Royal Infirmary, Leicester, UK.

Blood Pressure Monitoring
|December 19, 2002
PubMed
Summary

Aneroid sphygmomanometers often show significant inaccuracies compared to mercury devices, even when appearing functional. Regular dynamic calibration is crucial for ensuring accurate blood pressure readings and avoiding medical errors.

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Area of Science:

  • Cardiovascular diagnostics
  • Medical device calibration
  • Clinical measurement science

Background:

  • Blood pressure measurement is a fundamental clinical screening tool.
  • Mercury sphygmomanometers are being phased out, necessitating reliable alternatives.
  • Aneroid sphygmomanometers are widely used but their accuracy requires investigation.

Purpose of the Study:

  • To assess the accuracy of aneroid and mercury sphygmomanometers in a clinical setting.
  • To compare the performance of devices in current use against a gold standard.
  • To identify potential inaccuracies in commonly used blood pressure measurement devices.

Main Methods:

  • Compared 39 aneroid and 36 mercury sphygmomanometers to a calibrated mercury standard.
  • Utilized three blinded, trained observers for data collection.

Related Experiment Videos

  • Followed British Hypertension Society protocol for dynamic calibration across 30 pressure points.

    • Main Results:

    • A significant proportion of both mercury (14%) and aneroid (8%) devices were unsuitable for analysis.
    • Aneroid devices exhibited significantly higher rates of systematic errors (> 5 mmHg) than mercury devices (19% vs. 3%).
    • 50% of aneroid devices had readings deviating by > 10 mmHg, compared to only 10% of mercury devices.

    Conclusions:

    • Aneroid sphygmomanometers, even those appearing functional, demonstrate significant inaccuracies compared to mercury devices.
    • Dynamic calibration testing is essential to detect hidden faults in aneroid devices.
    • Regular accuracy checks using dynamic calibration are recommended to prevent erroneous blood pressure recordings.