In my opinion, the ideal training regimen:
4 years college
4 years medical school
1 year intern (IM/transitional)
3 year Cardiology residency
2 or 3 year Interventional Fellowship (train in all CHIP, SHD, PVD)
In the US education system, to become an interventional cardiologist…
4y of college.
4y of medical school.
3y of IM residency.
3y of CV fellowship.
2y of IC fellowship.
Assuming no gap years, that is a total of 16 years of training, after high school!!