Prospective study of hemodynamic performances of standard ATS and AP-ATS valves.

Background And Aim Of The Study: Following aortic valve replacement (AVR), a residual transprosthetic gradient can develop which has detrimental long-term effects, especially with regard to left ventricular mass regression and subsequent mortality. The Advanced Performance-ATS valve (AP-ATS) was developed to overcome this potential patient-prosthesis mismatch. In the present study, the early postoperative transprosthetic gradient was determined after AVR with ATS valves 18 to 25, to confirm the promise of superior hemodynamic performance of the AP series and to define respective indications.