To define the relationship between arm and leg blood pressure (BP) to inform the interpretation of leg BP readings in routine clinical practice where arm readings are not available.
Systematic review of all existing studies comparing arm and leg BP measurements. A search strategy was designed in MEDLINE and adapted to be run across six further databases. Articles were deemed eligible for inclusion if they measured and reported arm and leg BP taken in the supine position and/or the difference between the two. Mean values for arm–leg BP difference and measures of precision [95% confidence intervals (CIs) or SD] were extracted and entered into a random-effects meta-analysis.
A total of 887 articles were screened and 44 were included in the descriptive analyses, including 9771 patients. In the general population, ankle SBP was 17.0 mmHg (95% CI 15.4–21.3 mmHg) higher than arm BP in the supine position. For DBP, there was no difference between arm and ankle BP (−0.3 mmHg, 95% CI −1.5–1.0 mmHg). In patients with vascular disease, SBP was −33.3 mmHg (95% CI −59.1 to −7.6 mmHg) lower in the ankle compared with the arm.
This is the first review to provide empirical data defining the difference between BP in the arm and leg in the general population. Findings suggest a diagnostic threshold of 155/90 mmHg could be used for diagnosing hypertension when only ankle measurements are available in routine practice.
aNuffield Department of Primary Care Health Sciences, University of Oxford, Oxford
bBritish and Irish Hypertension Society, Young Investigator Working Party
cBritish and Irish Hypertension Society, Blood Pressure Measurement Working Party
dBodleian Library, University of Oxford, Oxford
eUniversity Hospitals Birmingham NHS Foundation Trust
fSchool of Pharmacy, University of Birmingham, Birmingham, UK
Correspondence to James P. Sheppard, Nuffield Department of Primary Care Health Sciences, Radcliffe Observatory Quarter, University of Oxford, Oxford OX2 6GG, UK. Tel: +44 1865 617192; e-mail: firstname.lastname@example.org
Abbreviations: BP, blood pressure; CI, confidence interval; CVD, cardiovascular disease
Received 5 July, 2018
Accepted 9 September, 2018
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