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Related Experiment Videos

Inaccuracy of the Hawksley random zero sphygmomanometer.

E O'Brien1, F Mee, N Atkins

  • 1Blood Pressure Unit, Beaumont Hospital, Dublin, Republic of Ireland.

Lancet (London, England)
|December 15, 1990
PubMed
Summary

The Hawksley random zero sphygmomanometer inaccurately measures blood pressure, consistently underestimating both systolic and diastolic readings. Its current design is unsuitable for hypertension research.

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Area of Science:

  • Cardiovascular research
  • Medical device accuracy

Background:

  • Accurate blood pressure measurement is crucial for epidemiological and intervention studies.
  • Sphygmomanometers are standard devices for blood pressure monitoring.

Purpose of the Study:

  • To evaluate the accuracy of the Hawksley random zero sphygmomanometer compared to mercury sphygmomanometers.
  • To determine the suitability of the Hawksley device for hypertension research.

Main Methods:

  • Two studies compared readings from the Hawksley device (UK and US models) with mercury sphygmomanometers.
  • Independent observers and device-swapping protocols were used to ensure robust comparison.

Main Results:

  • The Hawksley device showed significant underestimation of both systolic and diastolic blood pressure.

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  • The UK model underestimated systolic by 3.8 mm Hg and diastolic by 7.5 mm Hg.
  • The US model underestimated systolic by 2.6 mm Hg and diastolic by 6.2 mm Hg.

    • Conclusions:

    • The Hawksley random zero sphygmomanometer exhibits significant inaccuracies in blood pressure measurement.
    • Quantitative blood pressure data from studies using this device require re-evaluation.
    • The current design of the Hawksley sphygmomanometer is not recommended for hypertension research.