| ABDM | Ambulatory blood pressure monitoring; blood pressure measurement over a longer period of time (e.g. 24 hours) |
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| Ablation | lat.: ablation; in paediatric cardiology, describes the targeted destruction of structures in the cardiac catheter using high-frequency current, which are responsible for cardiac arrhythmias in the narrower sense |
| AI | Aortic valve insufficiency: leak in the aortic valve, with backflow of blood into the left ventricle |
| Aortic coarctation | AIST, CoA: Congenital narrowing of the aorta in the area of the aortic arch |
| AK | Aortic valve |
| Anticoagulation | Inhibition of the body's own coagulation with medication |
| Aorta | Main artery: blood vessel that transports blood into the body, where it supplies tissues and organs with oxygen and other substances. In a healthy heart, the aorta originates from the left ventricle |
| Arrythmia | Arrhythmia of the heart |
| AS | Aortic valve stenosis: Narrowing in the area of the aortic valve |
| ASD | Atrial septal defect: hole between the two atria |
| Assist Device | Implantable device to support the ejection capacity of the heart in advanced heart failure |
| AV channel | Combined congenital heart defect with an open connection between the atria and ventricles |
| AVSD | = AV channel: Atrioventricular septal defect |
| Aorto Pulmonaler Shunt | Kurzschlussverbindung zwischen der Hauptschlagader und der Lungenschlagader |