When the electrical signals reach the ventricles, the chambers contract and pump blood to the lungs or to the rest of the body. This slight delay allows the ventricles to fill with blood. Next, the heart signals arrive at a cluster of cells called the AV node, where the signals slow down. These electrical signals move across the atria, causing the heart muscles to squeeze (contract) and pump blood into the ventricles. The sinus node sends electrical signals that typically start each heartbeat. The heart's rhythm is controlled by a natural pacemaker (the sinus node) in the right upper chamber (atrium). The heart is made of four chambers - two upper chambers (atria) and two lower chambers (ventricles). It occurs when faulty electrical connections in the heart set off a series of early beats in the upper chambers of the heart (atria). Supraventricular tachycardia is an irregularly fast heartbeat. Call 911 or your local emergency number if you have an episode of SVT that lasts for more than a few minutes or if you have an episode with any of the following symptoms: Some signs and symptoms of SVT may be related to a serious health condition. However, in extreme cases, an episode of SVT may cause unconsciousness or cardiac arrest.Ĭall your health care provider if you have an episode of a very fast heartbeat for the first time or if an irregular heartbeat lasts longer than a few seconds. Supraventricular tachycardia (SVT) is generally not life-threatening unless you have heart damage or other heart conditions. If your infant or young child has any of these symptoms, ask your child's care provider about SVT screening. They include sweating, poor feeding, pale skin and a rapid pulse. In infants and very young children, signs and symptoms of SVT may be difficult to identify. Weakness or feeling very tired (fatigue).A fluttering or pounding in the chest (palpitations).Signs and symptoms of supraventricular tachycardia may include: Some people with SVT have no signs or symptoms. The fast heartbeat may come and go suddenly, with stretches of typical heart rates in between. The main symptom of supraventricular tachycardia (SVT) is a very fast heartbeat (100 beats a minute or more) that may last for a few minutes to a few days.
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