Long QT syndrome is usually caused by a faulty gene inherited from a parent. It can also be an underlying cause of sudden infant death syndrome (SIDS). Long QT syndrome is a leading cause of sudden cardiac death in young, otherwise healthy, people. If you're able to, perform cardiopulmonary resuscitation (CPR) until medical help arrives. This is called cardiac arrest, and the heart rarely returns to normal if it is not electrically corrected with shock.Ĭall 999 for an ambulance if someone with long QT syndrome suddenly collapses and does not regain consciousness. The heart usually returns to its normal rhythm after it's been beating abnormally.īut if it continues to beat abnormally and is not treated in time with a defibrillator, the heart will stop pumping and the person will die. strenuous exercise – particularly swimming.These symptoms can start unexpectedly and may be triggered by: heart palpitations, when the heart is beating in a fast or unpredictable way.seizures, which sometimes happen instead of a blackout when the brain is starved of oxygen.blackouts or fainting, because the heart has stopped pumping blood properly and the brain is temporarily starved of oxygen – the heart's rhythm returns to normal within a few minutes and the person regains consciousness.They may only become aware of their condition after having an electrocardiogram (ECG) for another reason. Some people with long QT syndrome do not have any symptoms. In some people, this can cause fainting or fits (seizures). Long QT syndrome is an inherited heart problem that affects how your heart beats.
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