Unmasking left ventricular systolic dysfunction in masked hypertension: looking at myocardial strain. A review and meta-analysis

Background and Aim: A growing body of evidence supports the view that masked hypertension (MH) (i.e. normal office and elevated out-of-office BP) is a blood pressure (BP) phenotype associated with increased risk of subclinical organ damage, cardiovascular disease and death as compared to true normotension. Whether left ventricular (LV) systolic function is impaired in individuals with MH is still a poorly defined topic. Therefore, we aimed to provide a new piece of information on LV systolic dysfunction in the untreated MH setting, focusing on speckle tracking echocardiography (STE) studies investigating LV global longitudinal strain (GLS), a more sensitive index of systolic function than conventional LV ejection fraction (LVEF). Methods: A computerized search was performed using Pub-Med, OVID, EMBASE and Cochrane library databases from inception until June 30, 2022. Full articles reporting data on LV GLS in MH, as assessed by ambulatory BP monitoring (ABPM), and normotensive controls were considered suitable for the purposes of review and meta-analysis. Results: A total of 329 untreated individuals with MH and 376 normotensive controls were included in six studies. While pooled average LVEF was not different between groups [64.5 ± 1.5 and 64.5 ± 1.3%, respectively, standard means difference (SMD): −0.002 ± 0.08, confidence interval (CI): 0.15/−0.15, P = 0.98), LV GLS was worse in MH patients than in normotensive counterparts (−18.5 ± 0.70 vs. −20.0 ± 0.34%, SMD: 0.68 ± 0.28, CI: 0.12/1.24, P < 0.01). Conclusions: Our findings suggest that early changes in LV systolic function not detectable by conventional echocardiography in the MH setting can be unmasked by STE and that its implementation of STE in current practice may improve the detection of subclinical organ damage of adverse prognostic significance.