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Abstract
Objective: Our aim was to evaluate the consequences of polyhydramnios on maternal plasma volume and maternal serum aldosterone and atrial natriuretic peptide (ANP) concentrations in monochorionic twin pregnancies complicated by twin-to-twin transfusion syndrome (TTTS). Methods: The maternal plasma volume, ionograms as well as plasma ANP and aldosterone concentrations were compared in normal monochorionic diamniotic twin pregnancies and in TTTS. Results: The maternal plasma volume was normal in TTTS despite severe polyhydramnios. The plasma aldosterone concentration was higher in pregnancies complicated by TTTS. Conclusion: The high plasma aldosterone concentration is likely to maintain normal plasma volume despite progressive extravascular volume enhancement. This suggests that TTTS is present early in pregnancy as a chronic phenomenon starting before its clinical expression and may trigger compensatory maternal hyperaldosteronism.
Published Version
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