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[Clinical and hemodynamic sequelae of mitral prostheses evaluated by Doppler echocardiography]
1Second Department of Surgery, School of Medicine, Kobe University.
Insights
This study compared mechanical mitral valves, finding no significant hemodynamic differences. Mitral valve orifice area was larger in Duromedics and Medtronic Hall valves than Björk-Shiley, with low complication rates across all types.
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
- Clinical Hemodynamics
Background:
- Mechanical mitral valves are crucial for treating mitral valve disease.
- Comparing the hemodynamic performance and clinical outcomes of different mechanical mitral valve prostheses is essential for patient care.
Purpose of the Study:
- To evaluate the relative superiority of mechanical mitral valves in the mitral position.
- To compare in vivo hemodynamics and clinical outcomes of Björk-Shiley convexo-concave, Duromedics, and Medtronic Hall mitral valves.
Main Methods:
- Doppler echocardiography was used to examine in vivo hemodynamics.
- Key indices evaluated included peak velocity of mitral flow (PV), mitral valve orifice area (MVA), mitral valvular regurgitation, NYHA classification, pulmonary capillary wedge pressure (PC), cardiac index (CI), and valve-related complications.
- Data from 63 Björk-Shiley (BS), 30 Duromedics (DM), and 58 Medtronic Hall (MH) valves were analyzed.
Main Results:
- No significant difference in peak velocity of mitral flow (PV) was observed among the valve types.
- Mitral valve orifice area (MVA) was larger in Duromedics (DM) and Medtronic Hall (MH) valves compared to Björk-Shiley (BS) valves.
- Clinical symptoms (NYHA) and hemodynamic states (PC, CI) improved postoperatively with low incidences of valve-related complications across all groups.
Conclusions:
- Mechanical mitral valves, including BS, DM, and MH types, demonstrate comparable hemodynamic performance and low complication rates.
- Duromedics and Medtronic Hall valves may offer a larger mitral valve orifice area compared to Björk-Shiley valves.
- All evaluated mechanical mitral valves provide satisfactory clinical outcomes and hemodynamic improvement post-implantation.
Abstract:
To determine the relative superiority of a prosthesis in the mitral position, in vivo hemodynamics were examined by Doppler echocardiography, and the results were compared with other types of mechanical mitral valves including 63 Björk-Shiley convexo-concave (BS) values, 30 Duromedics (DM) valves, and 58 Medtronic Hall (MH) valves. For this comparison, the following indices were evaluated: peak velocity of mitral flow (PV), mitral valve orifice area (MVA), mitral valvular regurgitation, New York Heart Association (NYHA) classification, pulmonary capillary wedge pressure (PC), cardiac index (CI) and valve-related complications. On Doppler echocardiograms, PV ranged from 1.2 to 2.0 m/sec with a mean of 1.6 m/sec. There was no evident relationship between the PV and the valve size in each type of prosthesis, and no significant difference in the PVs among the valves. The mean MVA was 2.6 cm2 (25 mm DM, 25 mm MH), which was regarded satisfactory from a clinical standpoint. MVA increased with the increase in the valve size in all types of valves, and of all sizes, MVA was larger in the DM and MH groups than in the BS group. Similarly, the incidence of valvular regurgitation was relatively low in all groups, and the degree of regurgitation proved to be grade II or less in all cases. As for the clinical results, clinical symptoms (NYHA) and hemodynamic states (PC, CI) improved postoperatively, with the differences among the types of prosthetic valves being insignificant. The incidences of thromboembolism, valvular thrombosis, valve failure and prosthetic endocarditis were relatively low in all groups.(ABSTRACT TRUNCATED AT 250 WORDS)