Invasive validation of the left ventricular global longitudinal strain for estimating left ventricular filling pressure.

Abstract

An elevated left ventricular (LV) filling pressure is the main finding in heart failure patients with preserved ejection fraction, which is estimated with an algorithm using echocardiographic parameters recommended by the recent American Society of Echocardiography (ASE)/European Association of Cardiovascular Imaging (EACVI) guidelines. In this study, we sought to determine the efficacy of the LV global longitudinal strain (GLS) in predicting an elevated LV filling pressure. A total of 73 prospectively selected patients undergoing LV catheterization (mean age 63.19±9.64, 69% male) participated in this study. Using the algorithm, the LV filling pressure was estimated using the echocardiographic parameters obtained within 24hours before catheterization. The LV GLS was measured using an automated functional imaging system (GE, Vivid E9 USA). Invasive LV pre-A pressure corresponding to the mean left atrial pressure (LAP) was used as a reference, and a LAP of >12mmHg was defined as elevated. Invasive LV filling pressure was elevated in 43 patients (59%) and normal in 30 patients (41%). Nine of 73 (12%) patients were defined as indeterminate based on the 2016 algorithm. Using the ROC method, -18.1% of LV GLS determined the elevated LAP (AUC =0.79; specificity, 73%; sensitivity, 84%) with better sensitivity compared to that by the algorithm (AUC =0.76; specificity, 77%; sensitivity, 72%). We demonstrated that LV GLS was an independent predictor of elevated LAP as the E/e' ratio and TR jet velocity and may be used as a major criterion for the diagnosis of HFpEF.