Interventional cardiologists are doctors who have been trained to perform procedures to treat cardiovascular disease. Interventional cardiologists specialize in angioplasty and stenting to treat cardiovascular disease.By using catheters, interventional cardiologists are able to treat many conditions without open surgery.nterventional cardiologists specialize in angioplasty and stenting to treat cardiovascular disease. By using catheters, interventional cardiologists are able to treat many conditions without open surgery.