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A prolonged qt interval indicates an abnormality detected on an ecg This abnormality reflects a disturbance in the conduction of electricity in the lower chamber (ventricles) of the heart. Overview people with long qt syndrome have a qt interval that’s longer than normal on an ekg. Long qt syndrome (lqts) is a disorder of myocardial repolarization characterized by a prolonged qt interval on the electrocardiogram (ecg) (waveform 1). Long qt syndrome can cause sudden fainting and seizures Young people with lqts syndrome have a higher risk of sudden cardiac death Treatment for long qt syndrome includes lifestyle changes and medicines to prevent dangerous heartbeats Sometimes a medical device or surgery is needed. Qt prolongation occurs when the heart muscle takes longer to contract and relax than usual It can affect heart rhythms and lead to sudden cardiac arrest The heart is a muscle that contracts. Qt prolongation may be congenital (due to genetic mutations) or acquired (secondary to medications, electrolyte disorders). Long or prolonged qt interval is the name of the abnormal pattern displayed on an electrocardiogram Long qt syndrome is often inherited, meaning it runs in the family and you're born with it It can also develop later in life Many medications can make the condition worse, including The primary test for diagnosing long qt syndrome is an ekg Normal qtc values are < 0.43 second for males and < 0.45 second for females and are considered prolonged when > 0.45 second for males or > 0.47 second for females (1).