Placental thickness and Transcerebellar diameter for accurate estimation of gestational age in the second trimester (A cross sectional study)

Document Type : Original Article

Author

Department of Obstetrics and Gynaecology, Faculty of Medicine-Ain Shams University

Abstract

Objective: To assess the accuracy of combined measurement
of placental thickness and transcerebellar diameter in estimation of fetal gestational age in second trimester.
Patients and Methods: A cross sectional study was conducted at ultrasound unit, department of obstetrics and gynecology,
Ain shams University Maternity Hospital in the period between
January 2020 and March 2020.The population studied included
161 pregnant ladies at 14 to 26 weeks.Trans-abdominal ultrasound (Samsung H60, Convex Pro = CV1 = 8MHz - probe 4.9
MHz) was used to asses placental thickness and transcerebellar
diameter.
Results: Our results showed that there is positive correlation
between Placental thickness and gestational age r= 0.44 which
is highly significant (P value < 0.001). Also highly statistically
significant positive correlation between TCD and G.A (P value < 0.001) r= 0.92. Statistical analysis of our results showed
that trans-cerebellar diameter was more accurate than placental
thickness for accurate estimation of gestational age with almost
perfect agreement (0.91) between gestational age by last menstrual period and gestational age by trans-cerebellar diameter.
Conclusion: Client’s aged 32.8 ±3.4. More than half had primary infertility with mean duration of 4.6 ± 2.4. Female factor
infertility was the commonest cause of infertility. The pregnancy rate per embryo transfer was 36.4%, miscarriage rate was
9.1%, while the live rate was 27.3%. The mean VAS scores at
1hour, 6 hours, 24 hours and at embryo transfer were 7.1 ± 2.8,
4.6 ±1.4, 2.8 ±1.2 and 1.0 ± 0.9 respectively. The mean Likert
score was 2.4 ± 0.9.
Conclusion: Both placental thickness and TCD are useful fetal
biometric parameters that can be used for assessment of gestational age. Although placental thickness is positively correlated
to G.A, it is not as accurate as TCD. Unfortunately, combined
use of placental thickness and TCD is not superior to TCD
alone in accurate estimation of gestational age.

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