Leads i and avl look at the lateral aspect of the

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Leads I and aVL look at the lateral aspect of the heart The other leads look at the heart from a horizontal plane (front to back) Precordial leads V1&V2 look at the septal portion of the heart. V3&V4 look at the anterior (front) of the heart. V5&V6 look at the lateral (side) of the heart. Summary of ECG Inferior-II, III, and aVF Lateral-I, aVL, V5, and V6 Septal- V1 and V2 Anterior-V3 and V4 Inferior MI- receives blood supply from the Right coronary artery or the Left circumflex artery(LCx) DON'T GIVE NITROGLYCERIN!!!!! Anterior MI-receives blood supply from the Left anterior descending artery Lateral MI- receives blood supply from the Left anterior descending artery(LAD) and the Left
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2 circumflex artery(LCx). Don't give Nitro to inferior&posterior MI's. Why? It decreases venous return/preload. ST depression: Myocardial ischemia ST depression indicates the heart tissue needs oxygen ST segment will be below the isometric line ST elevation-Myocardial infarction resembles a tombstone ST segment will be above the isometric line ST elevation indicates a MI, or a portion of the heart tissue has died Inverted T&Q waves may also be present. Elevation of >1 small box in limb leads from baseline Elevation of >2 small leads in precordial leads Patho of the Heart SA node- pacemaker of the heart causes the atria to contract AV node- gatekeeper Bundle of His Bundle branches Purkinje fibers P wave- atrial depolarization(contraction)
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