A New Automatic QT-Interval Measurement Method for Wireless ECG Monitoring System Using Smartphone

QT-interval prolongation is an important parameter for heart arrhythmia diagnosis. It is the time interval from QRS-onset to the T-end of electrocardiogram (ECG). Manual measurement of QT-interval, especially for ۱۲-leads ECG, is time-consuming. Hence, an automatic QT-interval measurement is necessary. A new method for automatic QT-interval measurement is presented in this paper, which mainly consists of three parts, including QRS-complex detection, determination of QRS-onset, and T-end determination. The QRS-complex detection is based on the modified Pan-Tompkins algorithm. The T-end is defined based on Region of Interest (ROI) maximum limit. We compare and test our proposed QT-interval measurement method with reference measurement in term of correlation coefficient and range of ۹۵% LoA. The correlation coefficient and the range of ۹۵% LoA are ۰.۵۷۵ and ۰.۲۹۰, respectively. The proposed method is successfully implemented in ECG monitoring system using smartphone with high performance. The accuracy, positive predictive, and sensitivity of the QRS-complex detection in the system are ۹۹.۷۰%, ۹۹.۷۸%, and ۹۹.۹۲%, respectively. The range of ۹۵% LoA for the comparison between manual and the system’s QT-interval measurement is ۰.۲۱۶. The results show that the proposed method is dependable on the measure of the QT-interval and outperforms the other methods in term of correlation coefficient and range of ۹۵% LoA.

کلیدواژه ها:

Electrocardiography ، Smartphone ، Algorithms ، Monitoring ، Physiologic