Myocardial Infarction and Ischeamia
Myocardial Infarction and Ischeamia
Lancashire & South Cumbria Cardiac Network
Myocardial blood supply
The left main coronary artery branches into the anterior descending (LAD) and the circumflex(Cx).
The Cx wraps around the left side and back of the heart-(the lateral side) of the left ventricle (V5,V6, I, aVL)
The LAD supplies the front of the heart(anterior portion) of the left ventricle (V1-V4)
ST Segment Depression
ST Segment Elevation
ST segments which are below an imaginary baseline is called ST depression. Indicates ischaemia, typically seen in angina
ST segments above the baseline are evident during the acute stage of an MI and indicates muscle injury. Can also be seen in pericarditis and printzmental angina
E
J + 60
Normal
Borderline
Horizontal
Downsloping
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