The Effect Of Preservation Of The Mitral Subvalvular Apparatus On Cardiac Function In Mitral Valve Replacement

Objective:The aim of this study is to evaluate the effect of preservation of the mitral subvalvular apparatus during mitral valve replacement on left ventricular functions.Methods:Retrospective analysis the 92 cases which underwent mitral valve replacement in the First Affiliated Hospital of Chongqing Medical University from March 2016 to September 2019.Those patients are divided into two groups.In 48 cases the posterior and subvalvular apparatus of mitral valve(experimental group)were preserved while the rest of the cases underwent traditional mitral valve replacement(control group).Parameters of left ventricular function of echocardiographic measurements were compared between observation group and control group at preoperative,early postoperative period(7 days after surgery)and late postoperative period(3 months,6 months after surgery),and perioperative conditions etc.Results:The application time of vasoactive drugs in the experimental group(4.25±1.19)days was significantly shorter than that in the control group(5.64±1.63)days(P<0.05),and the incidence of complications in the experimental group(8.34%)was significantly lower than that in the control group(25.00%)(P=0.031).Six months after the operation,the LAD(32.64±3.76)mm,LVEDD(43.60±3.68)mm and LVESD(31.81±4.73)mm were significantly lower in the experimental group than in the control group.LVEF(64.86±4.23)%and LVFS(36.04±2.90)%were significantly higher in the experimental group than in the control group.Conclusion:Miral valve replacement with preservation of subvalvular apparatus is beneficial for renewing cardiac function and for a short-term improvement of left heart function.