Hartley J W, Hahn A W, DeLorey M, Caldwell W M
John M. Dalton Research Center, University of Missouri, Columbia 65211.
Biomed Sci Instrum. 1990;26:11-5.
We have developed and used a system for recording and analyzing the electrocardiogram (ECG) of the horse during exercise. The system consists of a commercial ECG transmitter telemetering a Z lead (base-apex) ECG from an exercising horse. The received data are then remodulated at an audio frequency and stored on a audio cassette recorder. Exercise protocols of up to 10 minutes are digitized using a Macintosh II computer. For rhythm analysis, a computer program to identify the various waves of the ECG uses a modification and refinement of the integrated-squared-derivative (ISD) technique. This technique consists of frequency selective digital filtering and differentiation followed by integration of the squared derivative. The waves of the ECG are identified using adaptive thresholding of the ISD and the derivative of the ECG. Thus far, we have been able to successfully identify the Q, R, and the end of T in ECGs severely contaminated by exercise artifact. The system can place the absolute time of occurrence of the Q, R, and end of T in a text file for export to other analysis programs such as spreadsheets and statistics packages.
我们开发并使用了一种用于记录和分析马匹运动时心电图（ECG）的系统。该系统由一个商用ECG发射器组成，它通过遥测从一匹运动中的马获取Z导联（基顶导联）的ECG。接收到的数据随后被重新调制为音频频率，并存储在盒式录音机上。使用Macintosh II计算机对长达10分钟的运动方案进行数字化处理。对于心律分析，一个用于识别ECG各种波形的计算机程序采用了积分平方导数（ISD）技术的改进和优化版本。该技术包括频率选择性数字滤波和微分，然后对平方导数进行积分。通过对ISD和ECG导数进行自适应阈值处理来识别ECG的波形。到目前为止，我们已经能够在被运动伪迹严重污染的ECG中成功识别出Q波、R波和T波的终点。该系统可以将Q波、R波和T波终点的绝对出现时间记录在一个文本文件中，以便导出到其他分析程序，如电子表格和统计软件包中。
