don's ekg 12 lead lecture
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Regular P waves followed by QRS, rate 60 - 100 | Sinus Rhythm
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PR interval > .20 ; represents a slowing of conduction in the AV node | SR with 1st degree heart block
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PR interval widening with an occasional dropped QRS, usually not symptomatic | SR with 2nd degree heart block type I (wenkebach)
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PR interval > .20 but constant, usually 3:1 ratio and P wave not always followed by QRS complex | SR with 2nd degree heart block type II (mobitz)
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P-P constant, QRS constant, P is not followed by QRS in fact there is no correlation between P and QRS, "they do not talk"; usually symptomatic | 3rd degreee heart block
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QRS originates in AV node, QRS 40 -60 bpm, P wave may or may not be present | Junctional Rhythm (seen a lot in anesthesia)
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no P waves, comes from AV node rate >60 bpm | Accelerated Junctional rhythm
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Unable to get a PR interval, very irregular complexes, no p waves present | Atrial Fibrillation
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Saw tooth P waves present; QRS is regular; common 2:1 conduction | Atrial Flutter
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HR of 140 - 220; does not come from SA node buy the tissues around the AV node | Supraventricular Tachycardia
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HR 100-220 with wide bizarre QRS; can often lead to ventricular fibrillation | Ventricular tachycardia
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Failure of primary pacemaker, rate <40 bmp: this is the ventricles last ditch effort for cardiac output, QRS is wide and bizarre | Idioventricular Rhythm
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Which leads are the precordial leads? | V leads
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Which leads are the limb leads? | I,II, III
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Which leads are the augmented leads? | avf, avl, avr
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Which are the positive leads? | AvF, V3-6
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Which are the negative leads? | Limb leads, and AvR
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When lead I is up and avf is down what type of axis deviation is it? | Left shift
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When lead I is down and avf is up what type of axis deviation is it? | Right shift
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When lead I is down and avf is down what type of axis deviation is it? | Extreme right shift
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Bundle Branch Blocks are seen in which leads? | I, V1, V6, and a QRS > .12
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Right Bundle Branch Blocks are diagnosed how on EKG's | there is a R. S. R1 configuration in V1
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Left Bundle Branch Blocks are diagnosed how on an EKG | I positive and wide, "bunny ears" seen in V6, but sometimes look like a notch in the QRS in V5
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Anterior wall is supplied by what artery | LAD, seen best in V1-V4
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What is the treatment for and anterior wall MI? | Start nitro, stop sx, increase 02, gas off, fentanyl, and watch fluid overload
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Lateral wall is supplied by which artery | LAD, or obtuse, seen in lead I, avl, V5-V6
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Inferior wall is supplied by which artery | RCA, seen in leads II, IIIm abd avf
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how is a inferior wall MI treated | increase fluids, and get ready for dysrhythmias
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which wall is supplied by PDA and is seen as negative in leads V1 and V2 | posterior wall
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