中文

Journal of Applied Sciences ›› 2011, Vol. 29 ›› Issue (3): 289-293.doi: 10.3969/j.issn.0255-8297.2011.03.012

• Signal and Information Processing • Previous Articles     Next Articles

Detecting Onset and Offset of QRS Complex Based on Measurement of a Triangle

HU Xiao, WANG Jia-qing, ZHANG Ni   

  1. 1. School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006, China
    2. Guangdong Cardiovascular Institute, Guangdong General Hospital, Guangzhou 510080, China
  • Received:2010-09-10 Revised:2011-01-25 Online:2011-05-26 Published:2011-05-25
  • About author:胡晓，博士，副教授，研究方向：信号检测和处理，E-mail: huxiao@gzhu.edu.cn

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Abstract:

 An algorithm is proposed to detect onset and offset of QRS complex. Given a sequence of ECG signal samples, a triangle is formed by the current sample together with the sample before the previous one, and that after the following one. The interior angle corresponding to the vertex (the current sample), and the distance from the current sample to the opposite side of the triangle are calculated. If both the interior angle and the distance satisfy the pre-determined values, the current sample is judged as a Q, R or S peak. The onset and offset of QRS complex are thus found among the samples preceding and following QRS complex according to their interior angles. A total of 24 multichannel ECG records obtained from the Internet are used to test the proposed method. The experimental results show that the proposed method can accurately detect onset and offset of QRS complex, and the morphological feature of ST segment is effectively kept after its baseline wander is extracted from the ECG signal with the method.

Key words: electrocardiograph, QRS complex, morphological feature, baseline wander

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