Title :
Effect of acute myocardial ischemia on different high-frequency bandwidths and temporal regions of the QRS
Author :
Magrans, Rudys ; Gomis, Pedro ; Voss, Andreas ; Caminal, Pere
Author_Institution :
Dept. ESAII, Univ. Politec. de Catalunya (UPC), Barcelona, Spain
fDate :
Aug. 30 2011-Sept. 3 2011
Abstract :
The purpose of this study was to describe the changes in high-frequency QRS (HF-QRS) components due to myocardial ischemia provoked by prolonged artery occlusion during percutaneous coronary interventions (PCI). Signal-averaged ECGs from 69 patients were obtained during PCI procedures and comparison of high-frequency components of the QRS at different temporal regions and frequency bandwidth were performed. Continuous wavelet transform was applied to estimate the energy contents over the studied time-frequency regions. Seven frequency bands from 50 to 300 Hz, with bandwidth = 100 Hz were considered. The sum of all 12 leads energy decreased significantly (p <; 0.001) from pre-PCI to PCI during both second half and total QRS complex in all frequency bands, but the main effect was found in the 200-300 Hz band. The energy changes were more marked toward higher frequency bands. The second half of QRS complex was more sensitive to changes due to myocardial ischemia.
Keywords :
blood vessels; diseases; electrocardiography; medical signal processing; muscle; wavelet transforms; ECG; acute myocardial ischemia; artery occlusion; bandwidth 100 Hz; continuous wavelet transform; frequency 50 Hz to 300 Hz; high-frequency bandwidths; percutaneous coronary interventions; Arteries; Bandwidth; Electrocardiography; Indexes; Myocardium; Noise level; Time frequency analysis; Algorithms; Angioplasty, Balloon, Coronary; Coronary Vessels; Electrocardiography; Heart; Humans; Ischemia; Models, Statistical; Myocardial Ischemia; Myocardium; Reproducibility of Results; Signal Processing, Computer-Assisted; Time Factors; Wavelet Analysis;
Conference_Titel :
Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-4121-1
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2011.6091790