Living with long QT syndrome.  Slow recovery between heartbeats can cause problems, including sudden death.
D016757:Death, Sudden, Cardiac / Q000209:etiology* / Q000473:pathology; D006801:Humans; D008133:Long QT Syndrome / Q000150:complications* / Q000503:physiopathology* / Q000517:prevention & control; D012307:Risk Factors