CHANGES IN THE CONCENTRATIONS OF ALDOSTERONE IN THE PLASMA AND ADRENAL GLANDS OF THE FOETUS, THE NEWBORN AND THE PREGNANT GUINEA-PIG DURING THE PERINATAL PERIOD

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Abstract
Plasma and adrenal aldosterone concentrations were estimated by radioimmunoassay and by gas phase chromatography in the fetus, the newborn and the mother between day 62 of pregnancy and day 8 of postnatal life. The prenatal period is characterized by a gradual increase in plasma and adrenal aldosterone levels from day 62 up to 67. Birth greatly stimulates the synthesis and the release of aldosterone. In the neonatal period there are 2 peaks of maximum intensity in the plasma aldosterone concentration, one at 12 h together with a high adrenal aldosterone level, the other on day 5. In the mother the plasma aldosterone concentration is always higher than that of the fetus during the prenatal period and increases from day 64 of gestation until parturition and remains high during the first 24 h after parturition.

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