A stepwise approach can be used in the evaluation of tachycardias with a wide QRS complex, thereby reducing the chance for errors in diagnosis.
(1) Is there absence of an RS complex in all precordial leads?
(2) Is there an R-S interval > 100 msec in one precordial lead?
(3) Is atrio-ventricular dissociation present?
(4) Are morphologic criteria for ventricular tachycardia present in both (a) precordial leads V1 or V2, and (b) V6?
supraventricular tachycardia with aberrant conduction
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