3Stewart S,De Weess JA,The determinants of survivial following reoperation on prosthetic cardiac valve.Ann Thorac Surg,1978,25:555.
4Husebye DG,Pluth JR,Piehler JM,et al.Reoperation on prosthetic heart valves:An analysis of rish factors in 552 patients.J Thorac Cardiorasc Surg,1983,86:543.
5Basch X.Pomar JL.Pelletier LC,et al.Eearly and late prognosis after reoperation for prosthetic valve replacement.J Thorac Cardiovasc Surg,1984,88:567.
6Wideman FE,Blackstone EH,Kirklin JW,et al.Hospital mortality of re-replacement of the aortic valve incromental risk factors.J Thorac Cardiovasc Surg,1981,82:692.