Abstract

Global longitudinal strain (GLS) is a more sensitive prognostic factor than left ventricular ejection fraction (LVEF) in various cardiac diseases. Little is known about the clinical impact of GLS changes after acute myocardial infarction (AMI). The present study aimed to explore if non-improvement of GLS after 3 months was associated with higher risk of subsequent composite cardiovascular events (CCVE). Patients with AMI were consecutively included at a secondary care center in Norway between April 2016 and July 2018 within 4 days following percutaneous coronary intervention. Echocardiography was performed at baseline and after 3 months. Patients were categorized with non-improvement (0 to − 100%) or improvement (0 to 100%) in GLS relative to the baseline value. Among 214 patients with mean age 65 (± 10) years and mean LVEF 50% (± 8) at baseline, 50 (23%) had non-improvement (GLS: − 16.0% (± 3.7) to − 14.2% (± 3.6)) and 164 (77%) had improvement (GLS: − 14.0% (± 3.0) to − 16.9% (± 3.0%)). During a mean follow-up of 3.3 years (95% CI 3.2 to 3.4) 77 CCVE occurred in 52 patients. In adjusted Cox regression analyses, baseline GLS was associated with all recurrent CCVE (HR 1.1, 95% CI 1.0 to 1.2, p < 0.001) whereas non-improvement versus improvement over 3 months follow-up was not. Baseline GLS was significantly associated with the number of CCVE in revascularized AMI patients whereas non-improvement of GLS after 3 months was not. Further large-scale studies are needed before repeated GLS measurements may be recommended in clinical practice.Trial registration: Current Research information system in Norway (CRISTIN). Id: 506563

Highlights

  • The majority of patients who have been treated with early percutaneous coronary intervention (PCI) for acute myocardial infarction (AMI) are discharged without reduced left ventricular ejection fraction (LVEF) [1,2,3]

  • In a study of patients treated with PCI for ST-segment elevation myocardial infarction (STEMI), Antoni et al [8] reported significant improvement of global longitudinal strain (GLS) at 3 months and between 3 and 12 months

  • Baron et al [9] studied post AMI patients of whom 47% had STEMI and 90% had been treated with PCI

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Summary

Introduction

The majority of patients who have been treated with early percutaneous coronary intervention (PCI) for acute myocardial infarction (AMI) are discharged without reduced left ventricular ejection fraction (LVEF) [1,2,3]. In a study of patients treated with PCI for ST-segment elevation myocardial infarction (STEMI), Antoni et al [8] reported significant improvement of GLS at 3 months and between 3 and 12 months. GLS significantly improved during the following 12 months, with independent predictors being initial impairment of LV function, including assessment with GLS, male gender, non-smoking and treatment with beta-blockers. None of these studies, explored the association between the improvement or non-improvement of GLS and subsequent composite cardiovascular events (CCVE)

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