April 23, 2017
ECG characteristics of Torsades de Pointes (TdP)
Torsades de Pointes (TdP) was coined by Dessertnne in 1966 as a polymorphic ventricular tachycardia characterized by twisting of points.
1. Change in amplitude (QRS) and twisting of the QRS complexes around the isoelectric line
2. Short-long-short pattern of R-R cycles (short-coupled PVC followed by a compensatory pause and then another PVC that falls close to the peak of the T wave).
3.Usually shows a warm-up phenomenon
4. Frequently terminates spontaneously (in contrast to VF that does not terminate without defibrillation).
TdP - (suggested) to be confined to polymorphic VT with marked QT prolongation (> 500 ms) and QT-U deformity because of distinct mechanistic and therapeutic entity.
Labels: Torsades de pointes