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Types of MIs
Type 1 is a spontaneous MI related to ischemia from a primary coronary event (e.g., plaque rupture, thrombotic occlusion). Type 2 is secondary to ischemia from a supply-and-demand mismatch. Type 3 is an MI resulting in sudden cardiac death. Type 4a is an MI associated with percutaneous coronary intervention, and 4b is associated with in-stent thrombosis. Type 5 is an MI associated with coronary artery bypass surgery
Pericarditis causes widespread concave (“saddleback”) ST segment elevation with PR segment depression in multiple leads, typically involving I, II, III, aVF, aVL, and V2-6. There is reciprocal ST depression and PR elevation in leads aVR and V1. Spodick’s sign — a downward sloping TP segment — may also be seen.
Benign Early Repolarization
BER causes mild ST elevation with tall T-waves mainly in the precordial leads. Is a normal variant commonly seen in young, healthy patients. There is often notching of the J-point — the “fish-hook” pattern. The ST changes may be more prominent at slower heart rates and disappear in the presence of tachycardia.
- The Sokolow-Lyon
- S in V1 + R in V5 or V6 (whichever is larger) ≥ 35 mm
- R in aVL ≥ 11 mm
- The Cornell criteria for LVH are:
- S in V3 + R in aVL > 28 mm (men)
- S in V3 + R in aVL > 20 mm (women)