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Questionable accuracy of home blood pressure measurements in the obese population – Validation of the Microlife WatchBP O3® and Omron RS6® devices according to the European Society of Hypertension-International Protocol

Authors Azaki A, Diab R, Harb A, Asmar R, Chahine MN

Received 1 November 2016

Accepted for publication 24 January 2017

Published 27 February 2017 Volume 2017:13 Pages 61—69


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 4

Editor who approved publication: Dr Amudha Kadirvelu

Alaa Azaki,1,* Reem Diab,1,* Aya Harb,1,* Roland Asmar,1,2 Mirna N Chahine1,2

1Faculty of Medical Sciences, Lebanese University, Hadath, 2Foundation‑Medical Research Institutes (F-MRI®), Beirut, Lebanon

*These authors contributed equally to this work

Objective: Two oscillometric devices, the Microlife WatchBP O3® and the Omron RS6®, designed for self-blood pressure measurement were evaluated according to the European Society of Hypertension (ESH)-International Protocol (IP) Revision 2010 in the obese population.
Methods: The Microlife WatchBP O3 measures blood pressure (BP) at the brachial level and the Omron RS6 measures BP at the wrist level. The ESH-IP revision 2010 includes a total of 33 subjects. The difference between observers’ and device BP values was calculated for each measure. A total of 99 pairs of BP differences were classified into three categories (≤5, ≤10, and ≤15 mmHg). The protocol procedures were followed precisely in each of the two studies.
Results: Microlife WatchBP O3 and Omron RS6 failed to fulfill the criteria of the ESH-IP. The mean differences between the device and the mercury readings were: 0.3±7.8 mmHg and −1.9±6.4 mmHg for systolic BP and diastolic BP, respectively, for Microlife WatchBP O3, and 2.7±9.9 mmHg for SBP and 3.5±11.1 mmHg for diastolic BP for Omron RS6.
Conclusion: Microlife WatchBP O3 and Omron RS6 readings differing from the mercury standard by more than 5, 10, and 15 mmHg failed to fulfill the ESH-IP revision 2010 requirements in obese subjects. Therefore, the two devices cannot be recommended for use in obese subjects.

Keywords: Microlife WatchBP O3, Omron RS6, validation, blood pressure measurement, home blood pressure measurement, obese population, European Society of Hypertension, International Protocol

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