Cardiology is a medical specialty dealing with disorders of the heart. The field includes diagnosis and treatment of congenital heart defects, coronary artery disease, heart failure, valvular heart disease and electrophysiology. Physicians specializing in this field of medicine are called cardiologists. Cardiologists should not be confused with cardiac surgeons, cardiothoracic and cardiovascular, who are surgeons who perform cardiac surgery via sternotomy - open operative procedures on the heart and great vessels.

The term cardiology is derived from the Greek word καρδιά (transliterated as kardia and meaning heart or inner self).

* Electrical conduction system of the heart
   o Action potential
   + Ventricular action potential
* Sinoatrial node
* Atrioventricular node
* Bundle of His
* Purkinje fibers
* Heart Attack (Myocardial Infarction)

* Systole
* Diastole
* Heart sounds
* Preload
* Afterload
* Kussmaul's signature

* Atherosclerosis
* Restenosis
* Coronary heart disease (Ischaemic heart disease, Coronary artery disease)
* Acute coronary syndrome
   o Angina
   o Myocardial infarction (Heart attack)

* Aortic valve disorders
    o Aortic insufficiency
    o Aortic stenosis
    o Aortic valve replacement
    o Aortic valve repair
    o Aortic valvuloplasty
* Mitral valve disorders
    o Mitral valve prolapse
    o Mitral regurgitation
    o Mitral stenosis
    o Mitral valve replacement
    o Mitral valve repair
    o Mitral valvuloplasty
* Pulmonary valve disorders
    o Congenital pulmonic stenosis
* Tricuspid valve disorders

*
    o Wolff-Parkinson-White syndrome (WPW syndrome)