Paroxysmal supraventricular tachycardia (SVT) is the most common dysrhythmia in children. Some infants with SVT look quite well or may be somewhat pale with tachypnea, but have a heart rate of 240 beats per min or greater. Others are quite ill and in cardiovascular collapse.
SVT in infants is usually sustained, requiring medical therapy for conversion to a normal rate and rhythm. In older children, it is more likely to be truly paroxysmal, with episodes of varying duration and frequency.
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