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Torsade de Pointes: Difference between revisions
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Torsade de pointes is a ventricular tachycardia associated with a [[Conduction#The_QT_time|long QT time]] 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 | Torsade de pointes is a ventricular tachycardia associated with a [[Conduction#The_QT_time|long QT time]] 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. | ||
There has been much debate in the ''Circulation'' journal among French and American scientist whether one should write ''Torsades de Pointes'' or ''Torsade de Pointes''. As for now ''Torsade'' is prefered (unless one sees rotations around more than one axis in one episode).<cite>Moise</cite> | There has been much debate in the ''Circulation'' journal among French and American scientist whether one should write ''Torsades de Pointes'' or ''Torsade de Pointes''. As for now ''Torsade'' is prefered (unless one sees rotations around more than one axis in one episode).<cite>Moise</cite> | ||