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Torsades de pointes, torsade de pointes or torsades des pointes (TdP; also called torsades) (/ t ɔːr ˌ s ɑː d d ə ˈ p w æ̃ t /, [2] French: [tɔʁsad də pwɛ̃t̪], translated as "twisting of peaks") is a specific type of abnormal heart rhythm that can lead to sudden cardiac death.
Early afterdepolarizations can result in torsades de pointes, tachycardia, and other arrhythmias. [3] EADs can be triggered by hypokalemia and drugs that prolong the QT interval, including class Ia and III antiarrhythmic agents, as well as catecholamines. [1] Afterhyperpolarizations can also occur in cortical pyramidal neurons.
The term "torsades de pointes" is translated from French as "twisting of the peaks" because the complexes appear to undulate, or twist around, the EKG baseline. TdP can be acquired by inheritance of a congenital long QT syndrome , or more commonly from the ingestion of a pharmacologic drug.
Torsades de pointes: 2 points T-wave alternans: 1 point Notched T-waves in at least 3 leads 1 point Low heart rate for age (children) 0.5 points Syncope with stress 2 points Cannot receive points both for syncope and Torsades without stress 1 point Congenital deafness 0.5 points Family history Other family member with confirmed LQTS 1 point
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It is usually a regular, wide complex tachycardia with a rate between 120 and 250 beats per minute. A medically significant subvariant of ventricular tachycardia is called torsades de pointes (literally meaning "twisting of the points", due to its appearance on an EKG), which tends to result from a long QT interval. [18]