cerebral palsy and sinus bradycardia

We have a seventeen year old girl with Cerbral Palsy, secondary to shaken baby syndrome. Her heart rate sometimes drops to 31, her normal rate usually is in the 50s or 60s, her cardiologist told me this was normal for a child with C.P. and said he finds no reason to treat it. Is this correct? Is my child at risk for heart failure?

[Cleveland Clinic]

It depends on the cause of the heart slowing. If this is sinus bradycardia and there is no suspicion of underlying  heart conduction disease it can be seen in patients without cardiac disease. But it also can be seen in people with serious conduction deficits, and so a holter monitor would be advisable to see if she has any episodes of high degree or complete heart block. If so she may be a candidate for a permanent pacemaker, but the usual indications for these devices include mainly symptoms of dizziness or lightheadedness, which I am sure she does not display.