Many people who have long QT syndrome don't have any signs or symptoms. You might be aware of your condition only because of: Results of an electrocardiogram (ECG) done for an unrelated reason A family history of long QT syndrome Genetic testing results Fainting is the most common sign of long QT syndrome. Fainting (syncope) occurs when the heart temporarily beats in an unorganized way  Read More

The potassium ion channels in the heart do not function properly in long QT syndrome type 1, which causes interference with the electrical activity of the heart. In people with LQT1, emotional stress or physical activity, especially swimming, can cause arrhythmias (abnormal heartbeats).LQT1 patients are more likely to experience torsades de pointes, the most dangerous type of ventricular tachycardia. Altho  Read More

Superior vena cava syndrome (SVC) is a condition that occurs when the vein that carries blood from the head, neck, and upper chest back up to the heart is blocked.The symptoms of SVC depend on which veins are affected, but they can include chest pain, headaches, swelling around the eyes and face, and difficulty swallowing or speaking.The risk factors for SVC include:Being over 40 yea  Read More