Possible origin of amniotic fluid constituents affecting thromboplastic activity

Area of Science:

• Biochemistry
• Obstetrics
• Hematology

Background:

• The clotting-accelerating activity of amniotic fluid (AF) is a known phenomenon.
• Clinical significance of AF's pro-coagulant properties has only recently been recognized.
• The origin of AF components influencing coagulation remains to be fully elucidated.

Purpose of the Study:

• To investigate the origin of amniotic fluid components responsible for its clotting activity.
• To determine the effects of various gestational tissue extracts on blood coagulation.

Main Methods:

• Preparation of normal saline extracts from placenta, amniotic membranes, chorionic membranes, fetal respiratory mucus, meconium, and fetal urine.
• Assessment of the effects of these extracts on the blood coagulation process.

Main Results:

• Extracts from placenta, amniotic membranes, chorionic membranes, and fetal respiratory mucus accelerated blood coagulation.
• Meconium extract and untreated fetal urine inhibited blood coagulation.
• Amniotic fluid contains components of both fetal and extrafetal gestational tissue origin that affect coagulation.

Conclusions:

• Amniotic fluid's pro-coagulant or anti-coagulant effect is dependent on the relative concentrations of its constituents.
• Both fetal and extrafetal gestational tissues contribute to the hemostatic properties of amniotic fluid.
• Understanding these AF components is crucial for appreciating its role in hemostasis.