Value of Combined Circumferential and Longitudinal Left Ventricular Systolic Dysfunction to Predict Adverse Outcome in Patients with Asymptomatic Aortic Stenosis.

Overview

abstract

BACKGROUND AND AIM OF THE STUDY: Patients with asymptomatic aortic stenosis (AS) may have left ventricular systolic dysfunction (LVSD) defined as an impairment of the circumferential and/or longitudinal (C&L) myocardial fibers, despite a preserved left ventricular ejection fraction (LVEF). An assessment was made as to whether the combined LVSD of C&L fibers has a prognostic impact in asymptomatic AS. METHODS: A total of 200 asymptomatic AS patients was analyzed. Midwall shortening and mitral annular peak systolic velocity were considered as indices of C&L function and classified as low if <16.5% and <8.5 cm/s, respectively. The primary outcome was a composite of major cardiovascular events (MACE), including aortic valve-related and ischemic cardiovascular-related events. RESULTS: During a 25-month follow up period, MACE occurred in 69 patients (35%),while 46 of 72 patients (64%) had C&L LVSD and 23 of 128 patients (18%) had not (p <0.001). Cox analysis identified C&L LVSD as an independent MACE predictor, together with aortic transvalvular peak gradient, E/E′ ratio and excessive left ventricular mass. C&L-LVSD also predicted the occurrence of aortic valve-related events and ischemic cardiovascular-related events analyzed separately. A receiver operating characteristic curve analysis showed that the area under the curve (AUC) for C&L LVSD in predicting MACE was 0.77, significantly higher (p = 0.002, z-statistic) than the AUCs of C&L fibers considered individually (0.64 and 0.63, respectively). CONCLUSION: C&L-LVSD provides additional prognostic information into traditional risk factors for patients with asymptomatic AS.