Analgesic

A medicine used to reduce pain. Pain medications are also called analgesics. Analgesics include aspirin, acetaminophen, and ibuprofen. Every pain medicine has benefits and risks. Specific types of pain may respond better to one medication over another. Results also...

Anaphylaxis

An acute systemic allergic reaction. In severe cases, this can include potentially deadly anaphylactic shock. Also known as Anaphylactic reaction. Anaphylaxis is a life-threatening, whole-body allergic reaction. After being exposed to a substance like bee sting venom,...

Anaplasia

Characteristics of a cell that make it identifiable as a cancer cell. Malignant A change in the structure of cells and in their orientation to each other; characteristic of malignancy. Malignant cells that have returned to a more undifferentiated or primitive...

Aneurysm

A ballooning out of the wall of an artery, which in time can leak blood or rupture, causing massive bleeding. An aneurysm is an abnormal bulge or “ballooning” in the wall of an artery. Arteries are blood vessels that carry oxygen-rich blood from the heart...

Angiocardiography

X-ray imaging of the heart and great vessels made visible by injection of a radio-opaque solution. Diagnostic imaging method that shows the blood flow through the heart and primary vessels. It is used to evaluate patients for cardiovascular surgery. A contrast medium...

Angiogenesis

The growth of new blood vessels from surrounding tissue into growing tissue. Angiogenesis is the formation of new blood vessels. Angiogenesis is a process controlled by certain chemicals produced in the body. Some of these chemicals stimulate cells to repair damaged...