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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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.
===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]].

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