Cardiothoracic Surgery is a specialised field of surgery that focuses on procedures involving the heart, lungs, and other chest organs.
To diagnose disorders in this part of the body, the specialist makes use of a variety of tests. These can take the form of electrocardiography. ECG measures the heart's electrical impulses, and gives him clues about the heart's condition.
If heart surgery is required – such as to implant artificial heart valves – he is the person who will do this. His speciality also involves implanting heart pacemakers, closing holes between the left and right ventricles (chambers) of the heart, or dealing with constrictions in the coronary vessels.