Dynamic filtration of high-frequency noise in ECG signal

Electromyographic (EMG) noise is constantly present in stress test electrocardiographic recordings, due to physical exercise. The aim of the study is to investigate a filter that suppress sufficiently the EMG noise, with minimal distortion of high frequency content of the QRS complex. We studied 106 patients: age 63±10 years, 45 males. Digital 12-lead electrocardiograms (EC) were acquired during stress ECG test using veloergometer. Median recording duration of 7. 08 minutes and a mean number of 669 RR intervals. The considered EMG filter was tested. and the noise suppression out of QRS is at least 2.5 times higher than in QRS. A comparison with previous results in the same database for the analysis of QRS and T wave alternans. produced significant decrease of standard deviation of PCA index in QRS interval.