![]() ![]() ![]() Many people with long QT syndrome have no signs or symptoms. Signs and symptoms Acquired long QT syndrome The condition was first clearly described in 1957. In the United States it results in about 3,500 deaths a year. It is a relatively common cause of sudden death along with Brugada syndrome and arrhythmogenic right ventricular dysplasia. Most people with the condition develop symptoms before they are 40 years old. Females are affected more often than males. Long QT syndrome is estimated to affect 1 in 7,000 people. With proper treatment this decreases to less than 1% over 20 years. For people with LQTS who survive cardiac arrest and remain untreated, the risk of death within 15 years is greater than 50%. Management may include avoiding strenuous exercise, getting sufficient potassium in the diet, the use of beta blockers, or an implantable cardiac defibrillator. LQTS can be diagnosed using an electrocardiogram (EKG) if a corrected QT interval of greater than 450–500 milliseconds is found, but clinical findings, other EKG features, and genetic testing may confirm the diagnosis with shorter QT intervals. ![]() Medications that are implicated include certain antiarrhythmics, antibiotics, and antipsychotics. Onset later in life may result from certain medications, low blood potassium, low blood calcium, or heart failure. The inherited form may occur by itself or as part of larger genetic disorder. Long QT syndrome may be present at birth or develop later in life. Some rare forms of LQTS are associated with other symptoms and signs including deafness and periods of muscle weakness. These episodes can be triggered by exercise or stress. It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. Long QT syndrome ( LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. Genetic, certain medications, low blood potassium, low blood calcium, heart failure Įlectrocardiogram (EKG), clinical findings, genetic testing īrugada syndrome, arrhythmogenic right ventricular dysplasia Īvoiding strenuous exercise, getting sufficient potassium, beta blockers, implantable cardiac defibrillator A QT interval of >480 ms is considered abnormally long. ECG showing typical pattern of inherited Long QT syndrome (LQT1). ![]()
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