torsades de pointes
Pronunciation: tor-SAHD duh PWANT
A specific type of polymorphic ventricular tachycardia characterized by QRS complexes that appear to twist around the baseline.
Full Definition
Torsades de pointes is a distinctive form of polymorphic ventricular tachycardia characterized by QRS complexes that seem to rotate or 'twist around the points' of the ECG baseline, giving the arrhythmia its French name meaning 'twisting of the points.' This potentially life-threatening arrhythmia typically occurs in the setting of prolonged QT interval and can degenerate into ventricular fibrillation if untreated. Common precipitating factors include electrolyte abnormalities (particularly hypomagnesemia and hypokalemia), certain medications that prolong the QT interval, and congenital long QT syndrome. Treatment involves correcting underlying causes, magnesium administration, and temporary overdrive pacing if necessary.
Usage
Usage note: Keep French spelling and italicize in formal writing; avoid anglicized versions.
In Context
- "The patient developed torsades de pointes secondary to quinidine-induced QT prolongation." — Case report
- "Intravenous magnesium successfully terminated the episode of torsades de pointes." — Emergency department note