It can also manually capture an “event” if you use the external activator at the time he is symptomatic. It is then “interrogated” like a
pacemaker, so that all events can be viewed. Certainly, for a 6-year old, a heart rate >230, especially at rest, is likely to be abnormal, such as supraventricular tachycardia (SVT), so this should be further evaluated as needed and treated. With a history of structural cardiac disease, he is certainly at greater risk to have SVT.