Cervical Length and Uterocervical Angle as Predictors of Spontaneous Preterm Birth

#Patients and Methods: This prospective cohort study was performed on 263 pregnant females aged from 19 to 35 years old carrying singleton, and uncomplicated pregnancy.

The study was done after approval from ethical committee. An informed written consent was obtained from the patient.

With aseptic measures and a high-frequency endo-vaginal 7.5 Hz. probe (GE Logiq P6), TVS examinations were done to all pregnant women. Dorsal lithotomy posture was applied to pregnant women who were instructed to evacuate their bladders. Without applying excessive pressure, the vaginal probe was inserted into the anterior fornix. At maximum magnification, a sagittal image of the cervix and anterior uterine wall was obtained. We identified the echogenic endocervical canal with the surrounded less echogenic cervical mucosa zone. The external os was noted at the junction of the cervix both anterior and posterior lips within the vaginal canal, but the internal os was situated at the end of the cervical mucosa in the lower uterine segment. CL and UCA were measured using the ultrasound's built-in angle caliper. The anterior UCA measurement involved calculating the angle formed by a line running through the cervix and another line along the lower front segment of the uterus, starting from the internal os. This was achieved by manually drawing two lines with the angle caliper: one connecting the internal and external os, and another extending from the internal os along the lower anterior uterine wall, up to a point 3 cm from the internal os.

The research involved close monitoring of pregnant participants up to the time of delivery. Demographics and pregnancy outcomes were collected and recorded. PTB was defined as delivery occurring before 37 complete weeks of gestation [9]. To support pregnancy, maternal progesterone was administered to all women with a short CL (less than 20mm but more than 10mm). In this study, cervical cerclage was not used in any case.

Sample Size Calculation: