Abstract
Objective: We evaluated effects of type, size, and orientation of mechanical mitral valve prostheses on hemolysis.Methods: Subjects were 84 patients who had undergone mitral valve replacement. Lactate dehydrogenase was mainly used as a marker of hemolysis and was measured before surgery, 1 month after surgery, and in the late postoperative period.Results: Valves used included 16 Medtronic-Hall, 32 St. Jude Medical, and 36 CarboMedics valves. Medtronic-Hall valves caused less hemolysis than St. Jude Medical or CarboMedics valves in the late postoperative period. This resulted because hemolysis due to Medtronic-Hall valves was more severe 1 month after surgery than in the late postoperative period and because hemolysis due to St. Jude Medical or CarboMedics valves was more severe in the late postoperative period than 1 month after surgery. One reason for this finding is that cardiac output was greater in the late postoperative period than 1 month after surgery, making regurgitation through the pivots of bileaflet valves more severe. The orifice area and the orientation of prostheses did not affect hemolysis.Conclusion: St. Jude Medical or CarboMedics valves caused more severe hemolysis than Medtronic-Hall valves in the late postoperative period.
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Ninomiya, M., Yagyu, K., Kaneko, Y. et al. Hemolysis after mitral valve replacement with mechanical valve prostheses. Jpn J Thorac Cardiovasc Surg 49, 230–235 (2001). https://doi.org/10.1007/BF02913521
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DOI: https://doi.org/10.1007/BF02913521