2Guiraudon GM , Ofiesh JG , Kaushik R. Extendedvertical transatrial septal approach to the mital valve.Ann Thorac Surg,1991,52:1058～1062.
3Kon ND,Tucker WY,Mills SA,et al.Mitral valve operation via an extended transseptal approach. Ann Thorac Surg,1993,55:1413～1417.
4Smith CR.Septal-superior exposure of the mitral valve.J Thorac Cardiovasc Surg,1992,103(4):623.
5Berreklouw E,Ercan H,Schonberger JP.Combined superior transseptal approach to the left atrium.Ann Thorac Surg,1991,51(2):293.
6Utley JR,Leyland SA,Nguyenduy T,et al.Comparison of outcomes with three atrial incisions for mital valve operations.J Thorac Cadiovasc Surg,1995,109:582～587.
