BIOL 2P93 Lecture Notes - Hyperglycemia, Edema, Ureter
4 Feb 2013
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Maternal physiologic adaptations to pregnancy: respiratory system, mechanical changes. Tidal volume increases at expense of erv, but constant respiratory rate. Maternal compensation is increased hco3 renal excretion: oxygen uptake. Placenta acts as a concurrent exchange system, \ umbilical vein po2 . In reality, umbilical po2 is always less than uterine po2 uterine vein po2. Many factors most affect uterine po2 (ph, blood flow, o2 saturation and capacity and uterine consumption rate) Fetal oxygenation can be enhanced (e. g. in maternal hypoxia) by. Administering iv fluids ( blood volume, co, blood flow) Roll mom to left side (decompress ivc, heart preload, co) Plasma volume and red blood cell mass both increase, but plasma volume more so, \ hematocrit drops: cardiac output increases. Result of increased hr and increased sv. Co is less in supine position due to fetus compression of ivc. Increased output is directed mostly to uterus, skin, and breast: other.
