FHR Reflects:
Fetal Oxygenation
Obtaining a "category 1" or "Normal" FHR Rules Out:
Metabolic Acidemia
Extrinsic Fetal Oxygenation Pathway Factors Include:
1. Maternal oxygenation
2. Uterine Blood Flow
3. Placental Exchange
4. Umbilical Blood Flow
Intrinsic Fetal Oxygenation Pathway Factors Include:
1. Fetal Circulation
2. Oxygenation of Tissues
3. FHR Regulation
Well-Oxygenated Maternal Blood is Dependent Upon 2 Main Things: Also What
Conditions Could Hinder Each?
1. Adequate Hgb Concentration & Saturation (O2 Carrying Capacity) Problem could
arise with severe maternal anemia
2. Adequate Arterial Oxygen Tension (PaO2) (Maternal Ventilation and Pulmonary Fxn)
Problem could arise with maternal asthma
Maternal Blood Flow Prior to Pregnancy and During:
50ml/min --> approx. 700ml/min
% of Maternal Blood Flow that Passes Through Intervillous Space
70-90%
% of Maternal CO Towards Uterine Blood Flow
10-15%
Maternal Blood Flow and Fetal Blood Flow are Connected Via:
Endometrial Arteries
Umbilical Vein Carries:
Oxygenated Blood to Baby
Umbilical Arteries Carry: