Individuals with<unk>  syndrome do not carry an increased risk of sudden death. The only morbidity associated with the syndrome is the occurrence of paroxysmal episodes of tachycardia which may be of several types, including sinus tachycardia, atrioventricular nodal re-entrant tachycardia, atrial fibrillation, or atrial flutter.
Lown–Ganong–Levine syndrome
Wolff–Parkinson–White syndrome
Lucey–Driscoll syndrome
Morgagni Stewart Morel syndrome
Bhaskar–Jagannathan syndrome
Claude's syndrome
Witteveen–Kolk syndrome
Townes–Brocks syndrome