ABSTRACT
The acute management of the patient presenting with a broad complex tachycardia is a daunting clinical challenge. A broad complex tachycardia may be ventricular or supraventricular in origin and the ability to interpret correctly the 12-lead electrocardiogram is of critical importance in this differentiation. Broad complex tachycardia should be assumed to be ventricular in origin unless there is compelling clinical and electrocardiographic evidence to the contrary. This article focuses on the immediate diagnosis and management of broad complex tachycardia. In view of the broadening indications for implantation of cardioverterdefibrillator devices (ICD) in the management of ventricular arrhythmias, an approach to the ICD patient presenting to the accident and emergency department with recurrent device discharges is discussed.
ABSTRACT
Narrow complex tachycardia usually refers to an abnormality of cardiac rhythm involving the tissues of the sinus node, atrial tissue, the atrioventricular node or an accessory atrioventricular communication. Although atrial fibrillation is the most common supraventricular arrhythmia, the term "supraventricular tachycardia" conventionally refers to the group of rhythm disturbances encompassing sinus tachycardia (appropriate and inappropriate), atrial tachycardia, atrial flutter, atrioventricular nodal reciprocating tachycardia (AVNRT) and atrioventricular reciprocating tachycardia (AVRT) including the Wolff Parkinson White syndrome (WPW). Atrial fibrillation is beyond the scope of this article which focuses on the diagnosis and acute management of the patient presenting with one of these common causes of a regular, narrow complex tachycardia.