TITLE:
Accuracy of Trans-Cerebellar Diameter and Placental Thickness in Third Trimesteric Pregnant Women for Calculation of Gestational Age: A Cross Sectional Study
AUTHORS:
Alaa Sayed Hassanin, Hassan Tawfik Khairy, Aya Tullah Abd Elfatah Elshaer, Sarah Safwat
KEYWORDS:
Accuracy of Trans-Cerebellar Diameter, Placental Thickness, Third Tri-mesteric Pregnant Women, Gestational Age
JOURNAL NAME:
Open Journal of Obstetrics and Gynecology,
Vol.13 No.2,
February
28,
2023
ABSTRACT: Background: Accurate determination of gestational age has become important for
deciding the appropriate time for termination of the pregnancy as well as to
monitor the fetal growth during the entire period of pregnancy. Objective: The
aim of the study was to assess whether the trans-cerebellar diameter, placental
thickness or combining both of them is more accurate for assessment of
gestational age in the 3rd trimester of pregnancy. Patients and Methods: This is a cross sectional study conducted at outpatient Clinic and
Obstetric ward, Ain Shams University Maternity Hospital, over a period of six
months from March 2019 to September 2019. One hundred pregnant women were
recruited according to inclusion criteria either from outpatient clinic or were
admitted in obstetric ward Ain Shams Maternity Hospital to find out the most
accurate fetal biometric measurement in the third trimester either
trans-cerebellar diameter placental thickness or both compared to reliable LMP
(last menstrual period) dates confirmed by crown rump length (CRL) in the first
trimester. Results: Trans-cerebellar diameter mean ± SD was 46.0 ± 3.5
with range 38.2 - 51.7. The mean of placental thickness was 39.6 ± 7.1 with range 22.8 - 54.3. Placental thickness
had highest determination (0.813) for last menstrual period followed by
trans-cerebellar diameter (0.802). Combining trans-cerebellar diameter and
placental thickness increased determination (0.902) for last menstrual period. Conclusion: Combined use of trans-cerebellar diameter and placental thickness in the
third trimester of pregnancy is a reliable indicator for gestational age in
women whose last menstrual period is unreliable or unknown, but placental
thickness had higher accuracy than trans-cerebellar diameter.