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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. During TdP episodes, patients have a heart rate of 200 ...
The Arizona Center for Education and Research on Therapeutics (AZCERT) maintains the CredibleMeds database. Founded in 2000 at the University of Arizona as part of a network of 14 federally-funded CERTs, [9] AZCERT became a separate non-profit corporation in 2012 funded by the US Food and Drug Administration (FDA), research grants, and charitable contributions.
Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]
Potassium channel blockers exhibit reverse use-dependent prolongation of the action potential duration. Reverse use dependence is the effect where the efficacy of the drug is reduced after repeated use of the tissue. [11] This contrasts with (ordinary) use dependence, where the efficacy of the drug is increased after repeated use of the tissue.
Adults with mild type 2 diabetes might improve their insulin sensitivity by following a low-carb diet, thus potentially eliminating the need for medication, a new study suggests.
Long QT syndrome, the most common form of cardiac channelopathy, is characterized by prolonged ventricular repolarization, predisposing to a high risk of ventricular tachyarrhythmias (e.g., torsade de pointes), syncope, and sudden cardiac death.
Examples of these inherited arrhythmia syndromes include long QT syndrome (LQTS), Brugada syndrome (BrS), catecholaminergic polymorphic ventricular tachycardia (CPVT), and short QT syndrome (SQTS). Many are also associated with environmental or neurogenic triggers such as response to loud sounds that can initiate lethal arrhythmias. [29]
Mexiletine has several uses including the treatment of abnormal heart rhythms or arrhythmias, chronic pain, and myotonia. In general when treating arrhythmias, mexiletine is reserved for use in dangerous heart rhythm disturbances such as ventricular tachycardia. [3] It is of particular use when treating arrhythmias caused by long QT syndrome. [4]