The fluid dynamic performance and lifetime of a prosthetic heart valve are one of the most important characteristics to determine the choice of what prosthesis must be applied to a patient. Because of this, two different biological prosthetic heart valves profiles (one high profile and other low profile) were studied, to verify possible alterations of working life, pressure gradient and reverse flux debt to this profiles difference. With a Pulse Duplication, ten valves sixe 29 were analysed , manufactured by Institute Dante Pazzanese de Cardiologia, being five low profile and five high profile. With a working frequency of 1000 ppm (pulses per minute) and a differential pressure of 1000 mmHg, we verified the same working life in both cases. With a Cardiac Simulator, the prosthesis was submitted to similar physiologic human cardiac conditions, with an equivalent 75 ppm heart pulse. The results show that the reverse flux volume necessary to close the low profile valve is lower than with the high profile valve. The loss head of these valves were compared though the maximum pressure gradient of them. It was noticed that the low profile, biological prosthetic valves are lower flux resistant than the high profile valves, being then more indicated to its implant function.
heart valves prostheses; heart valves prostheses