(see also Wolff-Parkinson-White Syndrome)

The Lown-Ganong-Levine (LGL) syndrome is a variation of the WPW preexcitation syndrome in which accessory fibers are used and the septum is stimulated too early. The pathway associated with this syndrome is thought to join with the atria and bundle of His (rather than with the ventricular myocardium). Thus, the normal impulse from the sinus node can bypass the slow AV conduction. As with WPW, reciprocating tachyarrhythmias can easily occur, and management is directed at them.