A stereologic study of postmature placentas fixed by dual perfusion
A new technique for preparing placentas for microscopic analysis did not find any deterioration of placental structure between term placentas and postterm placentas. The increase in complications seen with gestational length beyond term is believed to be due to placental insufficiency. Fourteen placentas from births occurring between 38 and 41 weeks gestation and 11 placentas from births occurring after 42 weeks gestation underwent dual perfusion and stereologic analysis. With dual perfusion, fixative is introduced both through the maternal blood vessels and the fetal vessels at pressures similar to normal blood flow. This expands vessels collapsed after birth. Stereologic analysis consists of making microscope slides from randomly chosen blocks of tissue, analyzing their structure microscopically, and calculating the quantity of certain structures in the whole placenta. The volume and the surface area of the villi, the volume of trophoblast tissue, and the diameter and length of villous capillaries were similar between term and postterm placentas.
Publication Name: American Journal of Obstetrics and Gynecology
How to get fixed
There are two types of vasectomies, both offering perhaps the safest form of permanent birth control available. The traditional vasectomy involves the use of a scalpel, while the no-scalpel vasectomy involves making a small hole in the scrotum.
Publication Name: Men's Health
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