1997;63:1737 41. 11. Hasbun R, Vikram HR, Barakat LA, et al. Complicated left-sided na- tive valve endocarditis in adults: risk classification for mortality. JAMA. 2003;289:1933 40. 12. Kiefer T, Park L, Tribouilloy C, et al. Association between valvular surgery and mortality among patients with infective endocarditis complicated by heart failure. JAMA. 2011;306:2239 47. 13. Tornos P, Sanz E, Permanyer-Miralda G, et al. Late prosthetic valve endo- carditis. Immediate and long-term prognosis. Chest. 1992;101:37 41. 14. Gordon SM, Serkey JM, Longworth DL, et al. Early onset prosthetic valve endocarditis: the Cleveland Clinic experience 1992 1997. Ann Thorac Surg. 2000;69:1388 92. 15. Prendergast BD, Tornos P. Surgery for infective endocarditis: who and when? Circulation. 2010;121:1141 52. 16. Funakoshi S, Kaji S, Yamamuro A, et al. Impact of early surgery in the active phase on long-term outcomes in left-sided native valve infective endocarditis. J Thorac Cardiovasc Surg. 2011;142:836 42.e1. 17. Bauernschmitt R, Jakob HG, Vahl CF, et al. Operation for infective endo- carditis: results after implantation of mechanical valves. Ann Thorac Surg. 1998;65:359 64. 18. Musci M, Siniawski H, Pasic M, et al. Surgical therapy in patients with active infective endocarditis: seven-year single centre experience in a sub- group of 255 patients treated with the Shelhigh stentless bioprosthesis. Eur J Cardiothorac Surg. 2008;34:410 7. 19. Yu VL, Fang GD, Keys TF, et al. Prosthetic valve endocarditis: superiority of surgical valve replacement versus medical therapy only. Ann Thorac Surg. 1994;58:1073 7. 20. Murdoch DR, Corey GR, Hoen B, et al. Clinical presentation, etiology, and outcome of infective endocarditis in the 21st century: the International Collaboration on Endocarditis-Prospective Cohort Study. Arch Intern Med. 2009;169:463 73. 21. Remadi JP, Habib G, Nadji G, et al. Predictors of death and impact of surgery in Staphylococcus aureus infective endocarditis. Ann Thorac Surg. 2007;83:1295 302. 22. 