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A. Artifact masquerading as monomorphic ventricular tachycardia. Close inspection reveals QRS complexes at the same rate as the preceding and succeeding sinus rhythm “marching through” the abnormal period. This figure represents sinus rhythm with mechanical artifact. B. Artifact that may be mistaken as ventricular tachycardia. Regular QRS complexes at 75 bpm are evident throughout the tracing, confirming the diagnosis of electronic artifact to explain the rapid spikes. A, reproduced with permission from Knight BP, Pelosi F, Michaud GF, et al: Clinical Consequences of Electrocardiographic Artifact Mimicking Ventricular Tachycardia. N Engl J Med. 1999 Oct 21;341(17):1270-4. Source: APPROACH TO THE PATIENT WITH CARDIAC ARRHYTHMIAS, Hurst's The Heart, 14e Citation: Fuster V, Harrington RA, Narula J, Eapen ZJ. Hurst's The Heart, 14e; 2017 Available at: http://mhmedical.com/ Accessed: June 10, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved