Fluid and Electrolyte Balance in Critically Ill Obstetric Patient
A variety of physiologic cardiovascular changes occur during pregnancy, and these must be considered when managing volume status in complicated obstetric patients. Beginning in early pregnancy, total body water slowly increases by 6–8 l due to retention of an additional 500–900 mEq of sodium [1–3]. This leads to a steady rise in plasma volume throughout the first two trimesters and into the early third, with a plateau at approximately 32 weeks . In a singleton pregnancy at term, the plasma volume is nearly 50 % greater than that seen in the nonpregnant individual . A smaller but parallel increase occurs in red cell mass, with a resultant physiologic fall in haemoglobin concentration .
KeywordsFresh Freeze Plasma Pulmonary Artery Catheter Fluid Challenge Obstetric Patient Colloid Osmotic Pressure
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