Page 28, Developmental Pathophysiology, Develop. Physiol., Dr. D. Penney

Placental-Fetal Pathologies:

There are also a number of common causes of blood loss, fetal anemia, and shock which may culminate in death: One of these is placental/fetal hemorrhage.

Abnormal separation of a placenta which develops in in the lower uterine segment (zone of dilitation), and may abnormally cover the os (of the uterus), will cause maternal and/or fetal bleeding. This is called "placenta previa".

Sudden, premature detachment of a placenta prior to birth, often attended by maternal ystemic reactions in the form of hock, oliguria, etc., known as "abruptio placentae", is another cause, and is involved in 15% of perinatal deaths.

Velamentous insertion of the cord, resulting from maldevelopment of the vessels, increases the risk of a tear or rupture.

Finally, fetofetal transfusion syndrome is caused by anatomosis between arteries, less frequently between veins. In this condition, blood is drained from one fetus into another.

Go to Next Page

Return to Previous Page

Return to Index