Placebo-controlled
A term used to describe a method of research in which an inactive substance (a placebo) is given to one group of participants, while the treatment (usually a drug or vaccine) being tested is given to another group. The results obtained in the two groups are then compared to see if the investigational treatment is more effective than the placebo.
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- Placenta
A temporary organ that joins the mother and fetus, transferring oxygen and nutrients from the mother to the fetus and permitting the release of carbon dioxide and waste products from the fetus. The placenta is roughly disk-shaped, and at full term it measures about 7 inches in diameter and slightly less than 2 inches thick. […]
- Placenta accreta
The abnormal adherence of the chorion of the placenta to the myometrium of the uterus. Normally there is tissue intervening between the chorionic villi and the myometrium, but in ‘placenta accreta, the vascular processes of the chorion grow directly in the myometrium. Placenta accreta can progress into placenta percreta.
- Placenta percreta
A condition in which the placenta invades the uterine wall. In placenta percreta, the vascular processes of the chorion (chorionic villi), a fetal membrane that enters into the formation of the placenta, can invade the full thickness of the myometrium. This can cause an incomplete rupture of the uterus. The chorionic villi can go right […]
- Placenta praevia
A placenta implanted near the outlet of the uterus, so that at the time of delivery the placenta precedes the baby. Placenta praevia can cause painless bleeding in the last third of pregnancy, and may be a reason for a C-section. Also known as low placenta.
- Placenta previa
A condition in which the placenta is implanted near the outlet of the uterus, so that at the time of delivery the placenta precedes the baby. Placenta previa can cause painless bleeding in the last trimester of pregnancy, and it may be a reason to perform a C-section. Also known as low ‘placenta.