Whats the difference between non-invasive cardiology, internal cardiology, and cardiology-pediatrician?
The linguistics of your question are a little odd, but I think the answer you’re looking for is this: a non-invasive cardiologist (adult or pediatric) doesn’t to do invasive procedures (i.e. diagnostic a/o interventional catheterization or invasive electrophysiology). There are adult cardiologists who did internal medicine residencies prior to subspecializing and there are pediatric cardiologists who did a pediatrics residency prior to training. Pediatric cardiology (where I am coming from) has further subspecialization in interventional, electrophysiology, cardiac critical care (generally someone who double boards in Peds Cards and Peds Critical Care), cardiac imaging (CT/MR), transplant, and adult congenital. There are also those who do a fourth year of fellowship in echocardiography in which fetal echo is emphasized (as well as honing transthoracic and transesophageal skills).