torsades de pointes

noun

tor·​sades de pointes tȯr-ˌsäd(z)-də-ˈpwant 

variants or torsade de pointes

-ˌsäd- 

: ventricular tachycardia that is characterized by fluctuation of the QRS complexes around the electrocardiographic baseline, is typically caused by a long QT interval, and may lead to life-threatening ventricular fibrillation