It is able to detect these
arrhythmias and, if they are persistent, deliver a shock to the
heart to electrically reset the
heart and stop the arrhythmia. This can help in the short term, but if the function of the heart continues to decrease, he may require a heart transplant. As you suggested, this can progress during puberty, where this is rapid growth and hormonal changes that can affect the body and the heart’s need to keep up.