假体门故障对胆叶叶片主动脉假体多普勒-导管梯度关系的影响
H Baumgartner1, H Schima, P Kühn
1Second Department of Internal Medicine/Cardiology, Krankenhaus der Barmherzigen Schwestern, Linz, Austria.
Circulation
|April 1, 1993
概括
胆叶叶片大动脉的多普勒和导管梯度之间的差异随着功能障碍而减少. 门的故障可能会导致多普勒梯度低估真正的血液动力学变化.
科学领域:
- 心血管研究的心血管研究.
- 医疗器械工程 医疗器械工程
- 血液动力学 血液动力学
背景情况:
- 已知多普勒和导管梯度之间的不一致性是正常胆叶片大动脉假肢.
- 局部梯度和压力回收有助于这些测量差异.
研究的目的:
- 调查假体门的故障如何影响多普勒和导管梯度之间的关系.
- 评估不同程度的故障对梯度测量的影响.
主要方法:
- 通过同时使用连续波多普勒和导管技术研究了一种19毫米的CarboMedics大动脉.
- 门功能在正常状态和各种故障场景下进行了评估,包括受限打开和传单封闭.
- 在不同的流速 (2.0-6.0 L/min) 中测量了峰值和平均梯度.
主要成果:
- 无论门的功能如何,都观察到多普勒和导管梯度之间的良好相关性 (r=0.99).
- 多普勒和导管梯度之间的关系 (斜率) 随着门功能的变化而显著变化,从1.08到2.08不等.
- 对于正常运行的门,多普勒梯度大约是导管梯度的两倍 (斜率~2.0).
- 随着故障的增加 (例如,叶片封闭),斜率下降,表明多普勒和导管梯度之间的差异较小.
- 梯度随着故障增加,但多普勒梯度增加低估了同时导管梯度增加.
结论:
- 对于正常胆叶叶动脉的多普勒和导管梯度之间的差异可能会随着门的故障而减少或消失.
- 由于门故障而增加的多普勒梯度可能会低估实际的血液动力学变化.
- 这强调了在解释梯度测量时考虑门功能的重要性.
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