**6. Structural heart defects**

Congenital cardiac defects following repair (tetralogy of Fallot—total correction; transposition of the great arteries—Mustard or Senning operation, and single ventricle lesions—Fontan operation) in 2% and un-operated CHDs, including aortic stenosis in 3% have been reported as causative factors for SCD following exercise activity [4–7]. The clinical features of these disease entities [32–37] and their long-term squealae [38, 39] were reviewed elsewhere [32–39] for the interested reader and will not be reviewed here.
