Novel hypertension phenotypes based on cross-classification of 24-h brachial and aortic SBP.

Abstract

Background: Novel hypertension phenotypes are described by cross-classification of brachial and aortic SBP (brSBP/aoSBP).

Objectives: The aim of this study is to examine their prevalence and age and sex-distribution, factors that potentially modulate them, and their association with left ventricular hypertrophy (LVH).

Methods: Data on 24-h ambulatory BP monitoring (ABPM) using the Mobilograph device (IEM GmbH, Stolberg, Germany) and LVH from the I nternational 24-h A mbulatory aortic B lood pressure C onsortium (i24ABC) were retrieved from 31 centers (17 countries). The population was categorized into four phenotypes; concordant systolic normotension (CSN: both SBPs normal), isolated brachial systolic hypertension (IbrSH: high brSBP/normal aoSBP), isolated aortic systolic hypertension (IaoSH: normal brSBP/high aoSBP), and concordant systolic hypertension (CSH: both SBPs high).

Results: In 8738 participants (age: 58.4 ± 15.1 years; 51.8% men), the prevalence of IaoSH was 7.7%, being more prevalent in men, and presenting a U-shape age-distribution in them compared to a linear distribution in females. IaoSH was associated with lower heart rate and beta-blockade medications. The prevalence of IbrSH was 6.5%, presenting an inverted U-shape age-distribution; it was higher in the presence of higher heart rate and calcium channel-blockade. In 2307 individuals with LVH data, after adjustment for age, sex, DBP, IaoSH - but not IbrSH - had 2.6 higher odds of LVH compared to CSN (95% confidence interval, 1.7-3.9) and similar to CSH.

Conclusion: IaoSH and IbrSH amounted to almost 15% and showed specific clinic characteristics. Only IaoSH was significantly associated with LVH. Outcome-driven randomized controlled trials are needed to further investigate their clinical relevance.