Cardiology is a branch of medicine that deals with the disorders of the heart as well as some parts of the circulatory system.
Cardiac surgery, or cardiovascular surgery, is surgery on the heart or great vessels performed by cardiac surgeons.
A heart transplant is surgery to remove the diseased heart from a person and replace it with a healthy one from an organ donor.
Electrophysiology is the branch of physiology that studies the electrical properties of biological cells and tissues.
An echocardiography, echocardiogram, cardiac echo or simply an echo, is an ultrasound of the heart.
Cardiothoracic surgery is the field of medicine involved in surgical treatment of organs inside the thorax —generally treatment of conditions of the heart and lungs.
Cardiac electrophysiology is the science of elucidating, diagnosing, and treating the electrical activities of the heart.
Interventional cardiology is a branch of cardiology that deals specifically with the catheter based treatment of structural heart diseases.