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You are a general paediatric trainee in a cardiology outpatient clinic and you see Thomas, a 14-year-old boy who was recently diagnosed with congenital long QT syndrome (LQTS) following the sudden death of his uncle, aged 45, while at work in his office. The diagnosis of LQTS was made postmortem on a molecular autopsy and the family subsequently underwent cascade screening. Thomas has been diagnosed as carrying a pathogenic mutation for LQT1 and commenced on a beta blocker. His resting ECG is sinus rhythm, you calculate the corrected QT interval (QTc) as 440 ms using Bazett’s formula and he otherwise has a normal physical examination and has had no symptoms of palpitations, syncope or presyncope. Prior to this diagnosis, Thomas played football for his school and would like to go back to training.