The treatment of<unk>  aims to restore a normal rhythm and to prevent the arrhythmia recurring. While<unk>  may spontaneously revert to a normal sinus rhythm, sustained<unk>  requires emergency treatment to prevent cardiac arrest. The most effective treatment to terminate<unk>  is an electrical cardioversion - a procedure in which an electrical current is applied across the heart to temporarily stop and then resynchronise the heart's cells. Treatment to prevent recurrent<unk>  includes infusion of magnesium sulphate, correction of electrolyte imbalances such as low blood potassium levels (hypokalaemia), and withdrawal of any medications that prolong the QT interval. Treatments used to prevent<unk>  in specific circumstances include beta blockers or mexiletine in long QT syndrome. Occasionally a pacemaker may be used to accelerate the heart's own sinus rhythm, and those at risk of further<unk>  may be offered an implantable<unk> fibrillator to automatically<unk> tect and<unk> fibrillate further episodes of the arrhythmia.
Torsades de pointes
Ventricular fibrillation
Pre-excitation syndrome
Brugada syndrome
Pacemaker syndrome
Takotsubo cardiomyopathy
Sudden arrhythmic death syndrome
Unstable angina