Key result
Experimental coronary occlusion links ST elevation to central ischemia and ST depression to peripheral normal zones.
Why the study?
The relationship between ST segment deviation and regional myocardial blood flow during partial coronary artery occlusion was not fully characterized.
Population
Dogs with partial occlusion of the anterior descending coronary artery
Comparison
Regional myocardial blood flow before and after partial occlusion
Design
Experimental preclinical study using radioactive tracer microspheres
Authors
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ST depression may reflect non-ischemic border zones in partial occlusion; leaves open translation to human ECG interpretation.
The study demonstrates that epicardial ST segment elevation correlates with severe central ischemia, whereas ST depression correlates with peripheral areas of normal or hyperemic flow during partial coronary occlusion.
TIMOGIANNAKIS et al. (1974) studied Myocardial ischaemia. Partial coronary artery occlusion vs. Before partial occlusion (control) was evaluated on ST segment deviation and regional myocardial blood flow. During experimental partial coronary artery occlusion in dogs, ST segment elevation occurred over central low-flow ischaemic zones, while ST depression occurred over peripheral normal or hyperaemic zones.
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