Open-label trial
A clinical trial in which researchers and participants know which drug or vaccine is being administered.
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- Opening, vaginal
The opening to the muscular canal that extends from the cervix to the outside of the body. In medicine, the vaginal opening is called the vestibule of the vagina.
- Operating room
A facility that is equipped for performing surgery. Abbreviated OR.
- Operation
In medicine, a surgical procedure. Many operations are named after persons. They range from A to Z, from the Abbe operation (on the lip) to the Ziegler operation (on the eye).
- Operation, Blalock-Taussig
A pioneering heart operation named after the American surgeon Alfred Blalock (1899-1964) and the pediatric cardiologist Helen B. Taussig (1898-1986). Dr. Taussig designed and Dr. Blalock carried out the first “blue-baby” operation to treat a child born with a previously inoperable heart malformation (tetralogy of Fallot). The procedure joined an artery leaving the heart to […]
- Operation, Macewen
A surgical operation to repair inguinal hernia that was designed by Scottish surgeon Sir William Macewen.