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Long QT Syndrome: Difference between revisions
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The '''Long QT Syndrome (LQTS)''' is characterized on the ECG by prolongation of the [[Conduction#The_QT_interval|heart rate corrected QT interval]]. This was first recognized by Dr. Jervell and Dr. Lange-Nielsen in 1957. They described 4 children with a long QT interval which was accompanied by hearing deficits, sudden cardiac death and an autosomal recessive inheritance.<cite>Lang1957</cite> | |||
The Long QT syndrome may be divided into two distinct forms: congenital Long QT syndrome and acquired Long QT syndrome. These forms may however overlap when QT prolongation due to medication occurs in a patient with congenital Long QT syndrome. | |||
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File:acquired_longQT.jpg|A 12-lead ECG of a patient with acquired long QT syndrome. Notice the QT prolongation. The QTc is about 640ms. | File:acquired_longQT.jpg|A 12-lead ECG of a patient with acquired long QT syndrome. Notice the QT prolongation. The QTc is about 640ms. | ||
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File:Lqts3.png|A 12 lead ECG of a patient with genetically proven LQTS3 | File:Lqts3.png|A 12 lead ECG of a patient with genetically proven LQTS3 | ||
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===Diagnosis=== | ===Diagnosis=== | ||
*The diagnosis is by measurement of the [[Conduction#The_QT_interval|heart rate-corrected QT interval]] on the ECG, which can be calculated with the [[QTc calculator]]. | *The diagnosis is by measurement of the [[Conduction#The_QT_interval|heart rate-corrected QT interval]] on the ECG, which can be calculated with the [[QTc calculator]]. | ||