Left Ventricular Global Longitudinal Strain as a Predictor of Outcomes in Patients with Heart Failure with Secondary Mitral Regurgitation: The COAPT Trial

Abstract

Left ventricular (LV) global longitudinal strain (GLS) is a sensitive marker of LV function and may help identify patients with heart failure (HF) and secondary mitral regurgitation who would have a better prognosis and are more likely to benefit from edge-to-edge transcatheter mitral valve repair with the MitraClip. The aim of this study was to assess the prognostic utility of baseline LV GLS during 2-year follow-up of patients with HF with secondary mitral regurgitation enrolled in the Cardiovascular Outcomes Assessment of the MitraClip Percutaneous Therapy for Heart Failure Patients with Functional Mitral Regurgitation trial. Patients with symptomatic HF with moderate to severe or severe secondary mitral regurgitation who remained symptomatic despite maximally tolerated guideline-directed medical therapy (GDMT) were randomized to transcatheter mitral valve repair plus GDMT or GDMT alone. Speckle-tracking-derived LV GLS from baseline echocardiograms was obtained in 565 patients and categorized in tertiles. Death and HF hospitalization at 2-year follow-up were the principal outcomes of interest. Patients with better baseline LV GLS had higher blood pressure, greater LV ejection fraction and stroke volume, lower levels of B-type natriuretic peptide, and smaller LV size. No significant difference in outcomes at 2-year follow-up were noted according to LV GLS. However, the rate of death or HF hospitalization between 10 and 24months was lower in patients with better LV GLS (P=.03), with no differences before 10months. There was no interaction between GLS tertile and treatment group with respect to 2-year clinical outcomes. Baseline LV GLS did not predict death or HF hospitalization throughout 2-year follow-up, but it did predict outcomes after 10months. The benefit of transcatheter mitral valve repair over GDMT alone was consistent in all subgroups irrespective of baseline LV GLS.