压力恢复对全碳倾斜盘式瓣膜评估的影响
Impact of pressure recovery in the evaluation of the Omnicarbon tilting disc valve.
作者信息
Dohmen G, Schmitz C, Langebartels G, Steinseifer U, Schmitz-Rode T, Autschbach R
机构信息
Clinic for Thoracic and Cardiovascular Surgery, University Hospital Aachen, Medical Faculty RWTH, Aachen, Germany.
出版信息
Thorac Cardiovasc Surg. 2006 Apr;54(3):173-7. doi: 10.1055/s-2005-873061.
BACKGROUND
Pressure recovery is not taken into account when calculating trans-prosthetic gradients after mechanical valve replacement using Doppler echocardiography. This may lead to underestimation of valvular performance.
METHODS
Simultaneous measurement of Doppler and direct trans-prosthetic gradients was performed in a circulatory mock loop simulator with physiologic parameters at different heart rates and cardiac outputs for small-sized aortic Omnicarbon tilting disc valves (19 - 21 mm).
RESULTS
In all adjustments the Doppler gradient significantly overestimated the net transvalvular gradient. The amount of pressure recovery averaged 59.3 %.
CONCLUSIONS
Doppler echocardiography does not allow for pressure recovery, which is a significant phenomenon in the hemodynamic function of the Omnicarbon tilting disc valve. Valve performance is much better than expected from Doppler gradients.
背景
使用多普勒超声心动图计算机械瓣膜置换术后的跨瓣膜压差时，未考虑压力恢复情况。这可能导致对瓣膜性能的低估。
方法
在循环模拟回路模拟器中，针对小尺寸主动脉全碳倾斜碟瓣（19 - 21毫米），在不同心率和心输出量的生理参数下，同时测量多普勒和直接跨瓣膜压差。
结果
在所有调整中，多普勒压差显著高估了净跨瓣膜压差。压力恢复量平均为59.3%。
结论
多普勒超声心动图未考虑压力恢复情况，而压力恢复在全碳倾斜碟瓣的血流动力学功能中是一个显著现象。瓣膜性能比根据多普勒压差预期的要好得多。
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