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Transcript
A: Undersensing. The fifth beat is a premature ventricular contraction (PVC). The next beat is a ventricular paced beat. Note that the paced beat occurs soon after the PVC, indicating a failure to sense the preceding complex. B: The first and second beats are paced and the third and fourth beats show normal AV conduction. There is a longer than expected pause between the fourth and fifth beats. This occurs secondary to ventricular oversensing. (Reproduced, with permission, from Garson A: Stepwise approach to the unknown pacemaker ECG. Am Heart J 1990;119:924.) Source: Chapter 35. Cardiac Arrhythmias, CURRENT Diagnosis & Treatment Emergency Medicine, 7e Citation: Stone C, Humphries RL. CURRENT Diagnosis & Treatment Emergency Medicine, 7e; 2011 Available at: http://mhmedical.com/ Accessed: May 13, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved
