An abnormal heart rhythm (or heartbeat) is called an arrhythmia or dysrhythmia. It's an issue with the heart's electrical system, which can be life-threatening.
Adults with congenital heart disease (CHD) were born with a birth defect of their heart. Many cases aren't diagnosed until symptoms appear in adulthood.
Angina (chest pain) is a medical term for the symptoms caused by the heart not getting enough oxygen from the arteries that supply the heart with blood.
Anomalous coronary arteries result when the coronary arteries don’t come from the usual location on the large artery that arises from the heart (aorta).
Total anomalous pulmonary venous return occurs when oxygen-rich blood from the lungs mixes with poorly oxygenated blood before being pumped into the body.
Aortic dissection is a life-threatening heart condition where the inside lining of the main artery (aorta) carries blood away from the heart and tears.
Aortic valve regurgitation is when the valve doesn’t close tightly enough, causing blood to leak back into the left ventricle and, thus, enlarging the heart.
Atherosclerosis is a condition where plaque (a fatty, waxy substance) forms deposits in the artery walls that can narrow the arteries and reduce blood flow.
Atrial fibrillation (Afib) is an irregular heartbeat caused by an abnormal heart rhythm that makes the upper heart chambers (the atria) quiver, or fibrillate.