Aims: Functional and structural abnormalities of the left atrium have been demonstrated to be clinically and prognostically significant in a range of cardiovascular disorders, increasing the risk of atrial fibrillation. Among the potential contributors to these aberrations, central arterial factors remain insufficiently defined. Accordingly, we sought to investigate the determinants of left atrium abnormalities in hypertension, with special focus on central haemodynamics.

Methods: In this retrospective, cross-sectional study, 263 patients (age 63.8 ± 8.0 years) with uncomplicated hypertension underwent echocardiography including left atrium strain (LAS) and volume analysis, and central haemodynamics assessment using radial tonometry.

Results: Patients were grouped depending on LAS and left atrium volume index (LAVI), using externally validated cutpoints (34.1% for LAS and 34 ml/m² for LAVI). The subset with lower LAS (n = 124) demonstrated higher central (cPP) and brachial pulse pressure (bPP), ventricular- arterial coupling, left ventricular mass index (LVMI) and LAVI, and lower global left ventricular longitudinal strain and early diastolic tissue velocity (e'). Patients with higher LAVI (n = 119) presented higher systolic blood pressure, cPP, bPP, central augmentation pressure, LVMI and E/e' ratio and lower LAS. In multivariable analysis, cPP was independently associated with both LAS ( β = -0.22; p = 0.002) and LAVI ( β = 0.21; p = 0.003). No independent associations with left atrium parameters were shown for bPP.

Conclusion: Higher cPP is detrimentally associated with left atrium structural and functional characteristics, thus providing a possible pathophysiological link with the development of substrate for atrial fibrillation. Prophylaxis of atrial fibrillation might be another argument for consideration in the treatment strategy in hypertension targeted measures addressing central blood pressure.

Item Type:	Refereed Article
Keywords:	hypertension, left atrial strain, left atrial volume, central blood pressure, atrial fibrillation
Research Division:	Medical and Health Sciences
Research Group:	Cardiorespiratory Medicine and Haematology
Research Field:	Cardiology (incl. Cardiovascular Diseases)
Objective Division:	Health
Objective Group:	Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:	Cardiovascular System and Diseases
UTAS Author:	Sharman, JE (Professor James Sharman)
UTAS Author:	Kosmala, W (Professor Wojciech Kosmala)
ID Code:	132073
Year Published:	2019
Web of Science® Times Cited:	1
Deposited By:	Menzies Institute for Medical Research
Deposited On:	2019-04-17
Last Modified:	2019-05-01
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