Electrocardiographic ST-segment changes during acute myocardial ischemia.
The recognition and management of patients with acute coronary syndromes has relied to a large extent on the standard 12-lead electrocardiogram (ECG) for assessing ST-segment changes associated with ischemia. The purpose of this review is to show both the capabilities and the limitations of the 12-lead ECG in recognizing ischemia, and to seek alternative electrocardiographic leads, optimized for detection of ischemia originating in different regions of the ventricular myocardium. Three such leads are proposed-based on the results obtained by electrocardiographic body-surface mapping performed during ischemia induced by balloon-inflation coronary angioplasty. A survey of recent clinical studies shows that the electrocardiographic manifestations of acute myocardial ischemia observed during coronary angioplasty are in agreement with the ST-segment measurements in admission ECGs of patients with acute myocardial infarction.
Horácek
B Milan
BM
Dalhousie University, Halifax, Nova Scotia, Canada. milan.horacek@dal.ca
Wagner
Galen S
GS
D018780:Body Surface Potential Mapping / Q000379:methods*; D003324:Coronary Artery Disease / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology*; D003331:Coronary Vessels / Q000503:physiopathology*; D004562:Electrocardiography / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D017202:Myocardial Ischemia / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology*