![]() SVT can be fleeting, and it is possible for symptoms to go unnoticed. You should consult a physician if you notice any of the following symptoms: In some patients, rapid heart rate may last for minutes or even longer. Any irregular heartbeat should be evaluated by a physician. SVT is generally not a life-threatening disease, but it can be very uncomfortable. One such disorder is Wolff-Parkinson-White syndrome, a disorder that causes SVT due to an extra electrical pathway between the top and bottom chambers of the heart. The most common forms of Supraventricular Tachycardia (SVT) in children are caused by extra electrical connections. From there, the electrical current travels down to the ventricles, causing them to contract and pump blood to the lungs and body. The AV node has the important job of delaying the impulse just long enough to ensure the atria have fully contracted and squeezed blood down to the ventricles. This impulse is received by another node called the atrioventricular (AV) node. It sends an electrical impulse throughout the atria, which results in atrial contraction. The human heart comes with a built-in pacemaker located in the right atrium known as the sinus node. The upper chambers are known as atria, and the lower chambers are called the ventricles. The heart has four chambers, two on top, and two below. For adults and children over 10 years of age, a normal rate is 60 to 100 beats per minute. According to medical resources, normal heart rate for an infant between 1 and 11 months old is 80 to 160 beats per minute. In infants, the heart rate can be as fast as 300 beats per minute and older children it is often as fast as 220 to 250 beats per minute.
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