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Torsade de Pointes: Difference between revisions
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Torsade de | '''Torsade de Pointes (TdP)''' is a form of polymorphic ventricular tachycardia associated with a [[Conduction#The_QT_time|long QT interval]] on the resting ECG. Torsade de Pointes is typically initiated by a short-long-short interval. A ventricle extrasystole (first beat: short) is followed by a compensatory pause. The following beat (second beat: long) has a longer QT interval. If the next beat follows shortly thereafter, ther is a good chance that this third beat falls within the QT interval, resulting in the R on T phenomenon and subsequent Torsades de Pointes. During Torsades de Pointes the ventricles depolarize in a circular fashion resulting in QRS complexes with a continuously turning heart axis around the baseline (hence the name ''Torsade de Pointes''). Read the chapter on the [[Long_QT_syndrome|Long QT Syndrome]] for an list of causes. Also, a more rare form of [[short coupled Torsades de Pointes]] has been observed.<cite>Leenhardt</cite> | ||
'''Treatment'''<cite>ACC</cite> | '''Treatment'''<cite>ACC</cite> | ||
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==Examples== | ==Examples== | ||
<gallery> | <gallery> | ||
Image:12leadTorsade.jpg|A twelve lead registration of Torsade de pointes. Reprinted with permission ''Copyright 2001 Texas Heart Institute'' <cite>Khan</cite> | Image:12leadTorsade.jpg|A twelve lead registration of Torsade de pointes. Reprinted with permission ''Copyright 2001 Texas Heart Institute'' <cite>Khan</cite> | ||
File:Torsades_de_Pointes_TdP.png|12-lead ECG of Torsades de Pointes (TdP) in a 56-year-old white female with a potassium of 2.4 mmol/L and a magnesium of 1.6 mg/dL. | |||
</gallery> | </gallery> | ||
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#Eldar pmid=3624666 | #Eldar pmid=3624666 | ||
#ACC pmid=16923744 | #ACC pmid=16923744 | ||
#Leenhardt pmid=8281648 | |||
</biblio> | </biblio> | ||
==External Links== | ==External Links== | ||
*[http://www.torsades.org A long list of drugs that can induce Torsade de Pointes] | *[http://www.torsades.org A long list of drugs that can induce Torsade de Pointes] | ||