Abstract:The relationship between maternal plasma levels of beta-endorphin (beta-Ep) during labor and various obstetrical factors was investigated in 115 healthy pregnant women. beta-Ep was determined by radioimmunoassay using double-antibody RIA kit (INCSTAR Corporation, Stillwater, M'S.). The results were as follows: (1) The primiparous women showed a significant increase of maternal plasma levels of beta-Ep at delivery compared with the multiparous women. In addition, the group of women whose Bishop's score at the o… Show more
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