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Oxytocin sensitivity test and cervical conditions were studied together as devised by Smyth and Cocks respectively, 250 times on 150 pregnant women near and at term being selected at random from those using the prenatal clinic, and 46 patients near and at term and other 4 patients between 28 and 34 weeds to whom inductions by oxytocin drip were performed from Oct. 1964 to Oct. 1965 at Hanil Hospital. The indications of induction were postmaturity 17 cases, elective inductions for normal pregnant women near and at term 14, toxemia of pregnancy 7, early rupture of the membrane 3, previous dystocia due to an over large fetus 3 and antepartum hemorrhage 2, and 2 cases of early rupture of the membrane and 2 cases of fetal death between 28 and 34 weeks. 1. Of 46 patients who reponded to 0.02 i.u. or less of oxytocin 34(73.9%) went into labor spontaneously within 48 hours but about 89.4% of 104 patients responsive to 0.03 i.u. or more after 48 hours. But in cases responsive to 0.03 i.u. or more of oxytocin the use of serial determinations was valuable to find out individual variations. 2. An intimate correlation between the oxytocin sensitivity and the maturity of the cervix could be obtained considering that 86.6% of 172 cases responsive to 0.05 i.u. or less of oxytocin had cervical conditions of Cocks type Ⅰ and Ⅱ, but 65.4% of 78 cases responsive to 0.06-0.10 i.u. had type Ⅲ and Ⅳ. 3. All 14 cases (100%) having Cocks type Ⅰwent into labor by oxytocin drip within 24 hours irrespective of the level of response to oxytocin and the average induction-labor interval was 9.5 hours. With half ripe cervix (Cocks type Ⅱ) and a positive response to 0.01-0.04 i.u. 87.5% of primigravidae(7 of 8 cases) and 85.7% of multigravidae (6of 7 cases) went into labor by oxytocin drip within 40 hours, but with the same cervical ripeness and a positive response to 0.05-0.10 i.u. only 28.6% of primigravidae (2 of 7 cases) and 57% of multigravidae (4 of 7 cases) went into labor within 40 hours. 4. Sacral ora of cervicies were noted in 15.3% of 150 pregnant women who went into labor spontaneously and 21.7% of 46 ptients to whom inductions were performed. Average duration of the first stage of labor of spontaneously delivered cases was 19 hours in primigravidae aud 13 hours in multigravidae having sacral os owing to a longer latent phase whereas 13 hours and 7.5 hours respectively in the group having normal positions of the cervix. Of the induction group having sacral os, average induction-labor interval in cases having Cocks typeⅠwas 14 hours and in cases having Cocks type Ⅱ 48.4 hours despite of 10.1 hours and 27.5 hours respectively in the group having normal positions of the cervix. It was convinced that the oxytocin sensitivity test gives a forecast to the oneset of labor and its reliability is more increased if the cervicial conditions are added, and the cervical conditions provide a more applicability to achieve the success of induction but if the oxytocin sensitivity is taken account the success rate will be increased within as reasonable time.
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