Screening for Jervell and Lange-Nielsen Syndrome (JLNS) is a research study to find out if it is possible to identify infants with JLNS at an early age, and to see if early identification of infants with JLNS makes a difference in the infant's lives.
JLNS is a hereditary disorder of the heart's electrical activity known as Long QT Syndrome. JLNS is the most severe form of Long QT Syndrome. JLNS is uncommon, it occurs in aporoximately 1 out of 100,000 people. However, among infants and children with hearing loss, JLNS has been reported to occur as high as 1 - 4% (1 out of 100 to 1 out of 25) of them.