Introduction to ECG interpretation part 1 Questions and Answers

Upright (atria dp top-bottom) or inverted (atria dp bottom-top) in lead II? PR interval analysis Constant or vary? = 0.20 seconds (1 large box) P to QRS relationship P wave before, during or after QRS? One P wave for each one QRS? Regular relationship? Monitoring ECG 4 lead, looking only at rate and rhythm Diagnostic ECG Use all 10 leads comma looking for MI, hypertrophy, axis deviation, PVC etiology, chamber enlargement, ect... Monitoring lead can tell you: How often the myocardium is the depolarizing, how regular the depolarization is, how long conduction takes in various areas of the heart, the origin of the impulses that are depolarizing The myocardium Monitoring lead cannot tell you: Presence or absence of MI, axis deviation, chamber enlargement, right vs left bundle branch blocks, quality of pumping action, whether the heart is beating!