3kalmar P,Irrgang E.Cardiac surgery in Cermany during 1997.Thorac Cardiovasc Surg,1998,46:307-310.
4Andradr IG,Cartier R,Panisi P,et al.Factors influencing early and late survival in patients with combined mitral valve replacement.Ann Thorac Surg,1987,44:607-613.
5Coper A,Tempe DK,Tomar AS,et al. Mechanical ventilation after open heart surgery.Indian Heart J,1992,44:167-168.