Left Atrial diameter Index as a prognostic factor for STEMI: a case-control study

Abstract Background： The left atrium has a considerable role in cardiac function because of its unique anatomy and physiological function. We evaluated the role of the size of the left atrium in the prognosis of STEMI by quantifying the left atrium by introducing a left atrial diameter index(LAdI). Methods: This is a retrospective study conducted in a University Affiliated Hospital. Echocardiography is used to evaluate the size of left atrial diameter. It is indexed by body surface(BSA) area to evaluate the significance of LAdI on the prognosis of STEMI.This study was approved by the medical ethics committee of The First Hospital of Jilin University. All subjects in this trial gave written informed consent. Results: A total of 473 patients with a first STEMI within two years met the inclusion criteria to be included in this study. LA（OR=6.945；95%CI 1.398~34.499； P =0.018）and EF （OR=0.931；95%CI 0.904~0.960; P =0.000 ）were independent risk factors for MACEs. Conclusion: Patients with a first STEMI with a greater LAdI have a greater risk of MACEs than patients with a normal left atrium despite well-established PCI therapies.