Telemetry Exam Study Guide
Cardiac conduction ECG components Heart auscultation All people enjoy time magazine Aortic, pulmonic, Erb's point, tricuspid, mitral P wave P wave= time for passage of the electrical impulse through the atrium causing atrial depolarization (contraction) Normal: 0.06-0.12 sec (remember, p for preteen: 6-12) What is a source of possible variation in P wave? disturbance in conduction w/in atria PR interval (PRI) -Measured from beginning of P wave to beginning of QRS complex -Represents time for impulse to spread thru atria, AV node, bundle of His, bundle branches, and Purkinje fibers (to point immediately preceding ventricular contraction) Normal: 0.12-0.20 sec What is a source of possible variation in PRI? Disturbance in conduction- usually in AV node, bundle of His, or bundle branches but could also be in atria Normal duration of Q wave 0.03 sec What is a source of possible variation in QRS complex? MI may result in pathologic wide (=0.03 sec) and deep Q wave QRS interval -Measured from beginning to end of QRS complex -Represents time for depolarization (contraction) of both ventricles (systole) Normal: 0.12 sec
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