<unk>  (LGL) is actually a pre-excitation syndrome with EKG findings including short PR interval, narrow or normal QRS complex, and a normal P wave. It is caused by the presence of accessory bundles of fibers known as James fibers which lead to the development of abnormal conduction pathways. The<unk>  was named after Bernard<unk> , William Francis<unk> , and Samual<unk>  who described it in 1952. Patients of LGL usually present with a history of palpitations, lightheadedness, shortness of breath, and sometimes chest pain. There is an increased risk of tachyarrhythmias and syncope. EKG is the principal modality of investigation for establishing a diagnosis. Usually, antiarrhythmics are given to prevent the development of tachyarrhythmias but recently radiofrequency ablation of the accessory pathways has been the mainstay of treatment with a good prognosis.
Lown-Ganong-Levine syndrome
Kashani-Strom-Utley syndrome
Townes-Brocks syndrome
Sohval-Soffer syndrome
Lucey-Driscoll syndrome
Johansson-Sinding-Larsen syndrome
Grisel's syndrome
Kearns–Sayre syndrome