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To elucidate the role of endogenous prostaglandin F2 alpha in spontaneous and induced labor, plasma concentrations of 13, 14-dihydro-15-keto-prostaglandin F2 alpha (PGFM) were determined before the onset of labor, at onset of labor, during active labor, at the crowning of the fetal head, and 1 and 2 hours after delivery. Patients in spontaneous labor and labor induced by amniotomy, oxytocin, and prostaglandin E2 were studied. The levels of plasma PGFM in patients who entered spontaneous labor fell 2 to 3 weeks before delivery, whereas those in the induced labor group did not change until the time of induction. Although the levels of PGFM rose gradually with the progress of labor in all cases, the levels in the spontaneous labor were significantly lower in each stage than in the corresponding stage of induced labor. These results suggest that endogenous prostaglandin F2 alpha (PGF2 alpha) production decreases 2-3 weeks prior to the spontaneous onset of labor and is increased again as labor progresses, that the patterns of PGF2 alpha production are similar to each other during spontaneous labor and labor induced by various methods. Therefore, it is felt that endogenous PGF2 alpha may participate in the progress of all kinds of labor.

endocrinologia japonica

Changes in the Plasma Prostaglandin F&lt;SUB&gt;2α &lt;/SUB&gt;Metabolite before and during Spontaneous Labor and Labor Induced by Amniotomy, Oxytocin and Prostaglandin E&lt;SUB&gt;2&lt;/SUB&gt;