Aortic valve, bicuspid
Aortic valve, bicuspid: Whereas the normal aortic valve in the heart has three flaps (cusps) that open and close, a bicuspid valve has only two. There may be no symptoms in childhood, but in time the valve may become stenotic (narrowed), making it harder for blood to pass through it, or the valve may start to let blood leak backwards through the valve (regurgitate). Treatment depends on how the valve is working and overall condition of the affected individual.
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- Aortitis
Aortitis: Inflammation of the aorta. The causes of aortitis include syphilis and rheumatic fever.
- AP
AP: AP is a versatile abbreviation. It serves in cardiology to abbreviate angina pectoris (AP) and arterial pressure (AP). In endocrinology, it stands for the anterior pituitary (AP). And in anatomy, AP means anteroposterior, i.e., from front-to-back.
- AP (anteroposterior)
AP (anteroposterior): In anatomy, AP stands for anteroposterior: from front-to-back. For example, an AP X-ray of the chest is taken from front-to-back. AP in this respect is the opposite of PA, which stands for posteroanterior: from back-to-front.
- AP, X-ray
AP, X-ray: An X-ray picture in which the beams pass from front-to-back (anteroposterior). As opposed to a PA (posteroanterior) film in which the rays pass through the body from back-to-front.
- APA
APA: 1. American Psychiatric Association. 2. American Psychological Association. 3. American Podiatry Association. 4. Antiphospholipid antibody. 5. Alkaline phosphatase activity.