Riley recently had her annual cardiology appointment, which revealed something new about her little heart. She has an accelerated junctional rhythm. This definition here, pulled from Wikipedia no less, is the simplest and plainest breakdown I've found so far:
So what this means for us, right now, is watching how this plays out. From our end, we'll monitor Riley and contact her doctor if she begins to tire easily, experience dizzy spells or anything else that indicates her heart is working too hard. Everything else about Riley's heart looks great, which is good news for us. And this could be something we don't ever have to fix. We just don't know right now. We do know that we trust her cardiologist. So when he said "Let's just watch it and see what happens" David and I are happy to agree.