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Mechanism and diagnostic potential of reciprocal ECG changes induced by acute coronary artery occlusion in pigs. | LitMetric
Background : Reciprocal ST-segment depression simulating additional subendocardial ischemia is commonly observed in ST-segment elevation myocardial infarction.Objective : To study the mechanism and characterization of the whole reciprocal electrocardiogram (ECG) patterns induced by acute coronary artery occlusion at different locations in the absence of additional subendocardial ischemia in pigs.Methods : Conventional 12-lead ECG and/or local extracellular epicardial, mid-myocardial, and endocardial electrograms were recorded during the acute occlusion of right coronary (RC) and left anterior descending (LAD) coronary arteries in the in situ (n = 9) or in the isolated perfused (n = 5) pig hearts.Results : Mid-RC occlusion induced reciprocal ST-segment depression (-0.43 ± 0.14 mV; P<.01) and S-wave deepening (-0.74 ± 0.23 mV; P<.01) in anterior ECG leads. Mid-LAD occlusion induced reciprocal S-wave deepening (-0.43 ± 0.37 mV; P = .02) but not ST-segment depression in inferior leads. Proximal LAD induced reciprocal ST-segment depression (-0.21 ± 0.20 mV; P = .03) and S-wave deepening (-0.56 ± 0.58 mV; P = .04) in inferior leads. Reciprocal QRS widening was observed only during proximal LAD occlusion. Local extracellular recordings did not show significant reciprocal QRS and ST-segment changes.Conclusions : In the absence of additional subendocardial ischemia, acute coronary artery occlusion induces reciprocal ST-segment and S-wave changes in the 12-lead ECG that allow better differentiation between proximal and mid-LAD occlusion. Reciprocal ECG changes depend on conventional lead system design and not on the transmission of injury currents from the ischemic border zone to distant normal myocardium.
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