Wang Yi
Alfred Imaging Group 144 Great North Road Five Dock New South Wales 2046 Australia.
St Vincent's Hospital Sydney 390 Victoria Street Darlinghurst New South Wales 2010 Australia.
Australas J Ultrasound Med. 2017 May 23;20(2):77-82. doi: 10.1002/ajum.12049. eCollection 2017 May.
The purpose of this article was to review the principal mechanisms of three types of heart assist devices, to explore their haemodynamic impacts on spectral Doppler and to discuss the associated challenges in diagnostic ultrasound.
Heart assist devices are used in patients with advanced heart failure as or . The arterial Doppler waveform features can be altered after the implantation of the devices. A continuous-flow device converts the arterial waveform into a venous-like waveform with a mean velocity that can be used in stenosis evaluation. When the pulsatile device produces extra pulses between the natural heartbeats, together they produce serrated arterial waveforms. When the pulsatile device serves as the only pumping source, the arterial waveforms are similar to the natural ones. Colour Doppler features are maintained despite all the spectral Doppler changes. These devices can affect both ultrasound scanning and interpretation. Therefore, it is essential to understand the principal mechanisms of these devices and their haemodynamic impacts so that an accurate ultrasound diagnosis can be made.
本文旨在回顾三种类型心脏辅助装置的主要机制，探讨它们对频谱多普勒的血流动力学影响，并讨论诊断超声相关挑战。
心脏辅助装置用于晚期心力衰竭患者作为……或……。装置植入后动脉多普勒波形特征可能改变。连续流装置将动脉波形转换为类似静脉的波形，其平均速度可用于狭窄评估。当搏动装置在自然心跳之间产生额外搏动时，它们共同产生锯齿状动脉波形。当搏动装置作为唯一的泵血源时，动脉波形与自然波形相似。尽管频谱多普勒发生了所有变化，但彩色多普勒特征得以保留。这些装置会影响超声扫描和解读。因此，了解这些装置的主要机制及其血流动力学影响至关重要，以便进行准确的超声诊断。
