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contentuptodate· Content· item f29_42_30374
©2013 UpToDate ® Print Email Atrial tachycardia ECG 3 Electrocardiographic tracing showing a narrow complex tachycardia with uniform P waves consistent with atrial tachycardia originating from the left superior pulmonary vein. The initial QRS complex shows a normal sinus beat, followed by the development of atrial tachycardia. Courtesy of Dr. Peter Kistler.