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