title: Effect of acute myocardial ischemia on different high-frequency bandwidths and temporal regions of the QRS.
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.
authors.affiliation: Department ESAII, EUETIB, Universitat Politècnica de Catalunya, and CIBER de Bioingeniería, Biomateriales y Nanomedicina, 08028 Barcelona, Spain. rudys.magrans@upc.edu
authors.forename: Rudys
authors.initials: R
authors.lastname: Magrans
authors.forename: Pedro
authors.initials: P
authors.lastname: Gomis
authors.forename: Andreas
authors.initials: A
authors.lastname: Voss
authors.forename: Pere
authors.initials: P
authors.lastname: Caminal
mesh_terms: D000465:Algorithms; D015906:Angioplasty, Balloon, Coronary / Q000379:methods; D003331:Coronary Vessels / Q000503:physiopathology; D004562:Electrocardiography / Q000379:methods; D006321:Heart / Q000503:physiopathology; D006801:Humans; D007511:Ischemia; D015233:Models, Statistical; D017202:Myocardial Ischemia / Q000473:pathology* / Q000503:physiopathology; D009206:Myocardium / Q000473:pathology; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D058067:Wavelet Analysis