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Related Experiment Videos

Inter-arm differences in blood pressure: when are they clinically significant?

Deirdre Lane1, Michele Beevers, Nicola Barnes

  • 1University Department of Medicine, City Hospital, Birmingham, UK.

Journal of Hypertension
|May 23, 2002
PubMed
Summary

Significant differences in blood pressure between arms were found in a study of 400 participants. This highlights the need for bilateral blood pressure measurement to avoid misdiagnosing hypertension.

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Area of Science:

  • Cardiovascular Health
  • Clinical Diagnostics
  • Medical Research Methodology

Background:

  • Blood pressure measurement is a cornerstone of cardiovascular assessment.
  • Inter-arm blood pressure differences can occur but their clinical significance requires investigation.

Purpose of the Study:

  • To investigate the presence and extent of significant blood pressure disparities between the two arms.
  • To determine the frequency of clinically important inter-arm blood pressure differences.

Main Methods:

  • A prospective, observational study involving 400 participants.
  • Simultaneous bilateral blood pressure measurements were taken using automated oscillometric devices.
  • Analysis focused on mean inter-arm differences and the frequency of significant disparities.

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Main Results:

  • Significant mean differences were observed in systolic blood pressure between arms (P < 0.0001).
  • Significant mean absolute differences were found for both systolic (P < 0.0001) and diastolic (P < 0.0001) pressures.
  • Clinically significant inter-arm differences (>10 mmHg) were present in 20% for systolic and 11% for diastolic pressures.

Conclusions:

  • Substantial inter-arm blood pressure differences, particularly in systolic pressure, are common.
  • Measuring blood pressure in both arms is crucial to prevent potential misdiagnosis of hypertension.
  • Age was identified as a predictor of significant inter-arm blood pressure variations.