NPTE
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| Generally benign, but may progress to atrial flutter, tachycardia or fibrillation | Premature atrial contractions (PAC)
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| Saw-tooth P waves, indicating valvular disease, acute MI, COPD, and PE | Atrial flutter
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| irregular undulations of ECG without discrete P waves. Occurs in healthy hearts and in patients with CAD, hypertension, and valvular disease | A fib
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| consistent,long PR interval due to medications that suppress AV conduction | 1st degree atrioventricular block
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| progressive prolongation of P-R interval generally benign | 2nd degree atrioventricular block (Mobitz1)
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| consecutive P-R intervals are the same follwed by nondonduction impulses. | 2nd degree atrioventricular block (Mobitz2)More serious condition
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| all impulses are blocked at the AV node. Medical emergency requiring a pacemaker | 3rd degree atrioventricular block
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| common causes include anxiety, caffeine, stress, smoking, and heart disease | Premature ventricular complex PVC
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| P waves are absent and QRS complexes are wide and aberrant in apperance | v-tach
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| ventricles do not beat, quiver asynchronously | v-fib
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| ventricular standstill with no rhythm. straight line | ventricular asystole
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| sign of subendocardial ischemia, can also be due to digitalis toxicity or hypokalemia | ST segment depression
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| earliest sign of acute transmural infarction | ST segment elevation
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| A characteristic marker of infarction | Q wave
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| occurs hours or days after an MI or CVA | T wave inversion
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