Title :
High frequency ECG during acute myocardial ischemia
Author :
Pettersson, J. ; Carro, E. ; Edenbrandt, L. ; Pahlm, O. ; Sörnmo, L. ; Warren, S.G. ; Wagner, G.S.
Author_Institution :
Dept. of Clinical Physiol., Lund Univ., Sweden
Abstract :
The purpose of this study was to determine the changes in high frequency QRS components during acute myocardial ischemia and to compare these changes with ST deviations in the standard ECG. Signal-averaged high resolution ECGs were obtained prior to and during percutaneous transluminal angioplasty (PTCA) in 17 patients. The QRS complexes were analysed within a bandwidth of 150-250 Hz. The amplitudes of the filtered QRS were expressed as root mean square (RMS) values. During inflation there were significant ST deviations in 13 patients; the RMS values decreased in 16 patients. The correlation between the maximal ST elevation and the maximal decrease in RMS in any lead was r=-0.59. Acute coronary artery occlusion produces changes in high frequency QRS components, even in the absence of ST segment deviation in the standard ECG
Keywords :
electrocardiography; medical signal processing; 150 to 250 Hz; ST segment deviation; acute coronary artery occlusion; acute myocardial ischemia; electrodiagnostics; filtered QRS; filtered QRS amplitudes; high frequency ECG; high frequency QRS components; inflation; percutaneous transluminal angioplasty; root mean square values; standard ECG; Arteries; Bandwidth; Electrocardiography; Electrodes; Frequency; Ischemic pain; Myocardium; Physiology; Signal analysis; Signal resolution;
Conference_Titel :
Computers in Cardiology 1997
Conference_Location :
Lund
Print_ISBN :
0-7803-4445-6
DOI :
10.1109/CIC.1997.647920
