Reverse Remodeling of Left Atrium Assessed by Cardiac MR Feature Tracking in Hypertrophic Obstructive Cardiomyopathy after Septal Myectomy

Eighty-eight patients with hypertrophic obstructive cardiomyopathy(HOCM) who received CMR before and after myectomy were retrospectively studied. Thier Pre- and postmyectomy left atrial (LA) parameters derived from CMR-feature tracking were compared. Patients with HOCM after septal myectomy showed LA reverse remodeling with a reduction in LA size and restoration in LA reservoir and booster function but unchanged LA conduit function. Among volumetric and functional changes, booster function had the greatest improvement postoperatively. Besides, preoperative LAVmin index and ΔLVOT might be potential factors associated with the degree of improvement in εa.