Observations on Cardiac Output in Animal Experiments and Clinical Application of Jiuling Bileaflet Mechanical Valve Prosthesis

摘要

Objective:To observe the cardiac output(CO)in animals and patients undergone valve replacement with Jiuling bileaflet mechanical valve prosthesis.Methods: 1.Animal experiments:6 sheep that subjected to mitral replacement with a 21-mm-valve prosthesis were measured by open cardiac catheterization intraoperatively. Echocardiographic and open cardiac catheterization under dobutamine stress were performed on 2 sheep survival for 30 months post-operation.2.Patient measurements:CO of 14 cases of aortic valve and 10 cases of mitral valve was measured by open cardiac catheterization,and after 12 months,it was measured by echocardiography.Results:1. Animal experiments:The mean CO of 6 sheep was 2.5 L/min intraoperatively by catheterization,and that of 2 sheep survival for 30 months post-implant was 3.0 L/min by echocardiography and 2.9 L/min by catheterization,respectively.2.Patient measurements: The mean cardiac index of 4 patients with 21 mm valve replacement was(2.55±0.27) L/min/m2by catheterization,and was(2.84±0.13)L/min/m2 by echocardiography after 12 months.Conclusion:This study demonstrates that cardiac function on animals and patients return to normal activity after undergone the valve replacement,and the newly valve prosthesis shows excellent hemodynamic performance.