LongQT and Brugada syndromes - Two ventricular arrhythmias induced by genetic events present usually in early life (mean onset of symptoms in longQTsyndrome is 12 years … intervals and coving of the ST-segment are seen in longQTsyndrome and Brugada syndrome, respectively. … If symptoms appear in childhood, genetic testing to confirm mutations characteristic for Brugada or longQTsyndromes is necessary.
Genetic testing for Brugada and longQTsyndromes and catecholaminergic polymorphic VT is also useful. … Patients with personal or familial history of sudden death should be evaluated for long and short QTsyndromes, Brugada syndrome, arrhythmogenic right ventricular dysplasia … When VT occurs in a patient with longQTsyndrome, this entity is called "torsade de pointes" and has a particular morphology.
A significant risk factor for this condition, however, is seen in patients with longQTsyndrome, renal disease, myasthenia gravis, optic neuritis and G6PD, suggesting that … To reduce the risk of cinchonism, quinine should never be administered to patients suffering from renal disease, cardiac abnormalities such as longQTsyndrome, myasthenia … To reduce the risk of cinchonism, quinine should be avoided in patients suffering from cardiac (most importantly longQTsyndrome) or renal disease, myasthenia gravis, optic … 
LongQTsyndrome … Sleep
Intrinsic disease of the SA node (E.g. sick sinus syndrome). … In patients with post infectious bradycardia, recovery often takes a long time and in some cases may not occur.
Females, who have longQTsyndrome, are more prone to develop ventricular tachycardia. … Congenital problems include longQTsyndrome and catecholaminergic polymorphic ventricular tachycardia. … Studies have shown that individuals with good left ventricular functioning, but having longQTsyndrome, and hypertrophic cardiomyopathy are at an increased risk of sudden … 
QTsyndrome which can result in sudden cardiac death. … They also frequently cause delayed gastric emptying (gastroparesis) and can sometimes lead to changes in metabolism with long-term use. … Care must be taken under such circumstances to avoid potentially fatal complications of refeeding syndrome.
All patients should be closely monitored for signs of longQTsyndrome and severe arrhythmias. … QTsyndrome and severe arrhythmias)
Patients with pre-existing epilepsy. … Neuroleptic malignant syndrome — a rare, life-threatening complication that results from the use of antidopaminergic agents.
In certain forms of longQTsyndrome, the potassium inward rectifier channel is affected. … Ventricular fibrillation can occur due to coronary heart disease, valvular heart disease, cardiomyopathy, Brugada syndrome, longQTsyndrome, or intracranial hemorrhage. … Recently described syndromes such as the Brugada Syndrome may give clues to the underlying mechanism of ventricular arrhythmias.