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This delay, which often can be seen on an electrocardiogram (ECG), is called a prolonged QT interval. In long QT syndrome, your heart's electrical system takes longer than normal to recharge between beats. After each heartbeat, the system recharges itself to prepare for the next heartbeat. Electrical signals (impulses) travel from the top to the bottom of your heart and trigger it to contract and beat. This coordinated action is controlled by your heart's electrical system.
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The heart's chambers contract and relax to pump the blood. Normally, the heart sends blood out to the body during each heartbeat. Long QT syndrome is a heart rhythm disorder caused by abnormalities in the heart's electrical recharging system. The heart valves, which keep blood flowing in the right direction, are gates at the chamber openings. The lower chambers, the more muscular right and left ventricles, pump blood out of the heart. The upper chambers, the right and left atria, receive incoming blood. Long QT syndrome can run in families.Ī typical heart has two upper and two lower chambers. If you have a first-degree relative (parent, sibling or child) with long QT syndrome, it's important to let your doctor know. When to see a doctorĬall your doctor if you suddenly faint during physical activity or emotional excitement or after taking any new medication. Signs and symptoms of long QT syndrome might occur during sleep. Some people with congenital long QT syndrome never have signs or symptoms. However, congenital long QT syndrome signs and symptoms can occur in babies during the first weeks to months after birth, or in childhood or later.
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Most people with symptoms of long QT syndrome have their first episode by age 40. If this doesn't happen by itself, or if an external defibrillator isn't used in time to set your heartbeat back to normal, sudden death will occur. Generally, the heart returns to its normal rhythm. Seizures also may occur in some people with LQTS. Some people have a warning sign first, such as lightheadedness, heart palpitations, weakness or blurred vision. A fainting spell from long QT syndrome can occur with little to no warning. Things that startle you - for example, a telephone or an alarm clock - can cause you to lose consciousness. You might faint when you're excited, angry or scared or during exercise.
- Results of an electrocardiogram (ECG) done for an unrelated reasonįainting is the most common sign of long QT syndrome.įainting (syncope) occurs when the heart temporarily beats in an unorganized way.
- You might be aware of your condition only because of: Many people who have long QT syndrome don't have any signs or symptoms. Click here for an infographic to learn more