As a genetic condition,<unk>  cannot be cured. However, many of symptoms of<unk><unk><unk>  such as blackouts due to abnormal heart rhythms or periodic paralysis can be successfully treated with medication or implantable devices. The rarity of the condition means that many of these treatments are based on consensus opinion as there are too few patients to conduct adequately powered clinical trials. General measures Medications should be avoided that further prolong the QT interval such as sotalol and amiodarone as these drugs can promote abnormal heart rhythms. Lists of medications associated with prolongation of the QT interval can be found online. Drugs which reduce blood levels of potassium such as diuretics like furosemide and bendroflumethiazide should also be avoided as these can worsen the tendency to periodic paralysis and arrhythmias. Conversely, potassium-containing supplements to increase blood potassium levels may be helpful. Very strenuous or competitive sport should be discouraged as these may increase the risk of arrhythmias, although gentle exercise should be encouraged. Arrhythmias Labelled chest X-ray showing an implantable cardioverter defibrillator. As in other forms of long QT syndrome which predispose those affected to dangerous heart rhythm disturbances, the risk of arrhythmias can be reduced by taking beta blockers such as propranolol that block the effects of adrenaline on the heart. Other antiarrhythmic drugs such as flecainide and verapamil may also be helpful. Those at highest risk of recurrent arrhythmias such as those who have already suffered a cardiac arrest may benefit from an implantable cardioverter defibrillator<unk>  a small device implanted under the skin which can detect dangerous arrhythmias and automatically treat them with a small electric shock. Periodic paralysis Periodic paralysis may be improved by taking carbonic anhydrase inhibitors such as acetazolamide.
Andersen–Tawil syndrome
Jervell and Lange-Nielsen syndrome
Dennie–Marfan syndrome
Romano–Ward syndrome
Timothy syndrome
Marfan syndrome
Catecholaminergic polymorphic ventricular tachycardia
CAMFAK syndrome