Cervical length as a predictor of pre-term birth in twin gestations.
The aim of this study was to determine the predictive value of cervical length as a risk factor for spontaneous pre-term birth in twin gestations. A retrospective chart review was carried out on patients with twin pregnancies referred to our multiples' clinic. Cervical length was measured by transvaginal ultrasonography. Patients with an indicated pre-term delivery or intervention were excluded from the analysis. Outcomes included preterm delivery < 28 and < 35 weeks gestation. After extracting the data, 2 x 4 tables were constructed. Likelihood ratios were then generated for cervical lengths < or = 2.0 cm, < or = 2.5 cm, < or = 3.0 cm, and > 3.0 cm. Because of the limited number of measurements taken < 25 weeks gestation, we elected to collapse the tables, thereby achieving more meaningful results. For measurements taken before 30 weeks gestation, a shorter cervix did predict delivery < 28 weeks gestation (likelihood ratios for cervical lengths < or = 2.0 cm, < or = 2.5 cm, < or = 3.0 cm, and > 3.0 cm were 4.43, 1.94, 0.97, and 1.02, respectively). The probability of preterm delivery < 35 weeks gestation increased with decreasing cervical length (likelihood ratios for cervical length < or = 2.0 cm, < or = 2.5 cm, < or = 3.0 cm, and > 3.0 cm were 2.58, 1.66, 1.38, and 0.81, respectively). A shorter cervix measured before 30 weeks gestation was a stronger predictor of preterm delivery < 28 weeks compared to < 35 weeks gestation. Cervical length was not predictive of preterm delivery if measured after 30 weeks. Cervical length is predictive of preterm delivery < 28 weeks and < 35 weeks gestation when measured before 30 weeks gestation. No trend was seen when measured after 30 weeks gestation. A prospective study is currently underway to confirm these results.
Shapiro
J L
JL
Deportment of Obstetrics and Gynecology, Sunnybrook and Women's College Health Sciences Center, University of Toronto, Ontario, Canada. jodi.shapiro@utoronto.ca
Kung
R
R
Barrett
J F
JF
D000886:Anthropometry / Q000379:methods*; D002584:Cervix Uteri / Q000000981:diagnostic imaging*; D005260:Female; D005865:Gestational Age; D006801:Humans; D016013:Likelihood Functions; D007752:Obstetric Labor, Premature / Q000000981:diagnostic imaging* / Q000209:etiology; D011237:Predictive Value of Tests; D011247:Pregnancy; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors; D014427:Twins; D016216:Ultrasonography, Prenatal / Q000379:methods* / Q000592:standards*