The job of a cardiac surgeon is to diagnose and treating conditions and diseases associated with the cardiovascular system of an human being. This can include problems due to reduced circulation because of narrowing of the arteries, issues in the heart valves injury to muscle tissue and conditions that affect the pericardium. The role of cardiologists is to handle emergencies like heart attacks in addition to treating congenital heart issues. If a patient requires heart surgery, the doctor will recommend an expert in Cardiothoracic Surgery. It is a specialized field that is difficult and if you've got the drive and determination to achieve your goals, you will be extremely satisfied as a Cardiologist.