There are two subspecialties
Invasive cardiology includes cardiac catherization, angioplasty, valvuloplasty, atherectomies, and restenosis. The first two are probably the most common procedures performed.
Non-Invasive cardiology does not involve penetration into the body. While a technician can perform a procedure, only the cardiologist is qualified to interpret the results and determine an appropriate diagnosis.
An invasive cardiologist typically has an annual salary
that is higher than an invasive cardiologist due mainly to the risk of a patient dying during the operation, as every invasive procedure has a risk