| Anastomosis | Surgical connection between two hollow organs, e.g. between two blood vessels or parts of the intestine |
| Aneurysm | Inborn or aquired bulge of the heart wall or an artery |
| Aneurysm-Clipping | Treatment of a cerebral aneurysm by putting a clip around it in order to stop the blood supply |
| Aortocoronary bypass | Surgical procedure performed in the case of blocked coronary arteries; e. g. vein transplant used to bypass a blocked coronary artery |
