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** If the heart axis turns significantly when compared to the heart axis during sinus rhythm a ventricular origin of the rhythm is more likely.
* What is the '''clinical setting'''?
** A wide complex tachycardia in a hemodynamically unstable 70-year-old man with previous myocardial infarction should be considered a [[ventricular tachycardia]] until proven otherwise
** A wide complex tachycardia in a 24-year-old woman with recurrent spells of tachycardia that respond to vagal maneuvers is most likely an [[AVNRT]] with aberrant conduction.