OBJECTIVE: To observe the changes of cervix in @entity1 between 16 and 35 weeks of gestation using transvaginal ultrasound and to determine the value of the cervix length in predicting @entity3152 among the @entity1 with threatened @entity3152 . METHODS: Transvaginal sonography were performed in 154 normal single nulliparous pregnant @entity1 between 16 and 35 weeks of gestation and 58 @entity1 with threatened @entity3152 but without premature @entity397 . RESULTS: (1) There is no definitely change in either cervical length or internal diameter of cervix among the pregnant @entity1 over the studied period. There was also no funneling to be observed. The mean cervical length is (36 +/- 5) mm, and the mean cervical internal diameter is (4 +/- 1) mm. (2) Eleven preterm deliveries occurred among the 58 pregnancy @entity1 with threatened @entity3152 . The cervical length by sonography of 11 preterm deliveries was (18 +/- 6) mm, and was significant shorter than the @entity1 without preterm deliveries whose mean cervical length was (32 +/- 6) mm (P < 0.001). The cervical length of @entity1 who delivered pretermly was totally <or= 26 mm. (3) A cervical length of 26 mm (x-2 s) as the cutoff to predict the @entity3152 among @entity1 with the threatened @entity3152 has a 100% of sensitivity, 81% of specificity, 55% positive predictive value and a 100% of negative predictive value. CONCLUSIONS: Cervical length by transvaginal sonography can be used to predict @entity3152 among the @entity1 with threatened @entity3152 . Among @entity1 treated for @entity3152 , a cervical length of less than 26 mm indicated a high risk of @entity3152 , and intensive management is required.

[Study of the cervix of normal pregnancy and threatened XXXX using transvaginal sonography].

@entity1 :: ('9606', 'Species') :: ['women'] @entity397 :: ('MESH:D012421', 'Disease') :: ['rupture of membrane'] @entity3152 :: ('MESH:D007752', 'Disease') :: ['preterm delivery', 'preterm labor']
@entity3152 :: (MESH:D007752,Disease) :: ['preterm delivery']
