Changes in concentration of human atrial natriuretic peptide (hANP) in normal and toxaemic pregnancy were examined. The maternal plasma concentration of hANP increased gradually during normal pregnancy to a maximum of 20·0±2·4 pmol/l (mean ± s.e.m.) after week 36 of pregnancy. From week 20, the plasma concentrations of hANP were significantly higher than those in non-pregnant women (9·3±2·0 pmol/l). In toxaemia with hypertension, maternal plasma hANP levels were increased after week 26 of pregnancy (37·7±6·0 pmol/l) compared with those in normal gravida at the same time (17·1±1·6 pmol/l). Maternal plasma hANP levels in toxaemia only with oedema were not different from those in normal gravida.
J. Endocr. (1987) 114, 325–328
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