The Lown-Ganong-Levine (LGL) syndrome is one of the pre-excitation syndromes of which Wolff-Parkinson-White (WPW) syndrome is the best known. In WPW syndrome there is an accessory pathway for conduction, called the Bundle of Kent, that bypasses the atrioventricular (AV) node. No such pathway has been identified for LGL. Theories to explain the condition have suggested possible accessory fibres that bypass all, or part of, the AV node.1 In some cases there may be a congenitally malfunctioning AV node.2 Whatever the pathophysiology, conduction is passed from the atria to the bundle of His without the delay usually incurred at the AV node.
This is a companion discussion topic for the original article at https://patient.info/doctor/lown-ganong-levine-syndrome