Why Torsades de Pointes is Called This
The term "torsades de pointes" (French for "twisting of the points") was coined by Dessertenne in 1966 to describe the characteristic ECG appearance of this polymorphic ventricular tachycardia, where the QRS complexes appear to twist around the isoelectric baseline. 1
The Origin of the Name
The name directly reflects what you see on the ECG tracing. The arrhythmia demonstrates a distinctive pattern where:
- The QRS complexes continuously change in amplitude and morphology, creating a visual appearance of "twisting" around the baseline 1
- This twisting pattern represents the "points" (pointes) of the QRS complexes appearing to rotate or spiral on the ECG
- The characteristic feature is this change in polarity in a modulating pattern, making the complexes appear to twist 2
Why This Visual Description Matters Clinically
The visual recognition is critical because torsades de pointes is a distinct mechanistic and therapeutic entity that requires different management than other ventricular arrhythmias 1. The twisting morphology helps distinguish it from:
- Monomorphic ventricular tachycardia (uniform QRS morphology)
- Ventricular fibrillation (chaotic, disorganized activity)
- Other polymorphic VTs without QT prolongation
Important Clinical Caveat
The term should be reserved exclusively for polymorphic tachycardias with marked QT prolongation (>500 ms) and QT-U deformity 1. The twisting morphology may not be evident in all ECG leads simultaneously 1, so you need to examine multiple leads to identify the pattern.
The descriptive name serves as a mnemonic: if you see the "twisting points" pattern on ECG in the context of a prolonged QT interval, you're looking at torsades de pointes—and this immediately tells you to avoid Class I antiarrhythmics and consider magnesium, pacing, or other QT-shortening interventions rather than conventional VT treatments.