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Reproducibility of sequential ambulatory blood pressure and pulse wave velocity measurements in normotensive and hypertensive individuals

Research output: Contribution to journalArticlepeer-review

Original languageEnglish
Pages (from-to)2528-2537
Number of pages10
JournalJournal of hypertension
Volume40
Issue number12
Early online date3 Oct 2022
DOIs
Accepted/In press12 Aug 2022
E-pub ahead of print3 Oct 2022
Published1 Dec 2022

Bibliographical note

Funding Information: This work was supported by the Medical Research Council and British Heart Foundation [MR/M016560/1]. The authors acknowledge financial support from the Department of Health via the National Institute for Health Research (NIHR) comprehensive Biomedical Research Centre and Clinical Research Facilities awards to Guy's and St Thomas’ NHS Foundation Trust in partnership with King's College London and King's College Hospital NHS Foundation Trust. Publisher Copyright: © 2022 Lippincott Williams and Wilkins. All rights reserved.

King's Authors

Abstract

Objective:
Errors in blood pressure (BP) measurement account for a large proportion of misclassified hypertension diagnoses. Ambulatory blood pressure monitoring (ABPM) is often considered to be the gold standard for measurement of BP, but uncertainty remains regarding the degree of measurement error. The aim of this study was to determine reproducibility of sequential ABPM in a population of normotensive and well controlled hypertensive individuals.

Methods:
Individual participant data from three randomized controlled trials, which had recorded ABPM and carotid-femoral pulse wave velocity (PWV) at least twice were combined (n = 501). We calculated within-individual variability of daytime and night-time BP and compared the variability between normotensive (n = 324) and hypertensive (n = 177) individuals. As a secondary analysis, variability of PWV measurements was also calculated, and multivariable linear regression was used to assess characteristics associated with blood pressure variability (BPV).

Results:
Within-individual coefficient of variation (CoV) for systolic BP was 5.4% (day) and 7.0% (night). Equivalent values for diastolic BP were 6.1% and 8.4%, respectively. No statistically significant difference in CoV was demonstrated between measurements for normotensive and hypertensive individuals. Within-individual CoV for PWV exceeded that of BP measurements (10.7%). BPV was associated with mean pressures, and BMI for night-time measurements. PWV was not independently associated with BPV.

Conclusion:
The variability of single ABPM measurements will still yield considerable uncertainty regarding true average pressures, potentially resulting in misclassification of hypertensive status and incorrect treatment regimes. Repeated ABPM may be necessary to refine antihypertensive therapy.

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