Butler B D, Robinson R, Fife C, Sutton T
Department of Anesthesiology, University of Texas Medical School, Houston 77030.
Aviat Space Environ Med. 1991 Oct;62(10):997-1004.
Precordial Doppler ultrasonic monitoring is routinely used for detection of venous gas bubbles resulting from decompression in hypobaric or hyperbaric applications. Bubble scoring codes have been devised in an attempt to quantify the number of audible bubble signals heard over the background sounds of the cardiac cycle. The audio interpretation of these ultrasonic backscatter signals remains the most common method for decompression evaluation. We report on the use of an inexpensive, commercially available audio digitizer in conjunction with a personal computer to digitize Doppler bubble signals for visual and electronic evaluation. This device can be operated simultaneously with Doppler audio monitoring. Precordial and arterial Doppler recordings of gas bubbles were obtained from anesthetized dogs after intravascular infusion or following decompression. Additional evaluations were conducted on Doppler bubble recordings obtained from human decompression studies. The device can be used in real-time or for later signal analysis. Accompanying menu-driven software provides for numerous signal modification options and visual displays. This device can provide a simultaneous visual display of Doppler signals normally only available for audio evaluation.
心前区多普勒超声监测通常用于检测低压或高压环境下减压产生的静脉气泡。人们设计了气泡评分代码，试图量化在心动周期背景声音中听到的可听气泡信号数量。对这些超声背散射信号的音频解读仍然是减压评估最常用的方法。我们报告了使用一种价格低廉、市售的音频数字化仪与个人计算机相结合，对多普勒气泡信号进行数字化处理，以便进行视觉和电子评估。该设备可与多普勒音频监测同时操作。在血管内输注后或减压后，从麻醉犬身上获取心前区和动脉多普勒气泡记录。对从人体减压研究中获得的多普勒气泡记录进行了额外评估。该设备可实时使用或用于后期信号分析。随附的菜单驱动软件提供了众多信号修改选项和视觉显示。该设备可以同时直观显示通常仅用于音频评估的多普勒信号。
