Significance of Foetal Transcerebellar Diameter in Foetal Biometry: A Pilot Study
Introduction: The most important parameter needed for appropriate management of pregnant women is accurate Gestational Age (GA). Routine sonographic estimation of GA by using Biparietal Diameter (BPD), Femur Length (FL), Abdominal Circumference (AC) and Head Circumference (HC) assumed important...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
JCDR Research and Publications Private Limited
2017-06-01
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| Series: | Journal of Clinical and Diagnostic Research |
| Subjects: | |
| Online Access: | https://jcdr.net/articles/PDF/9968/23583_CE[Ra1]_F(RK)_PF1(SwG_SS)_PFA(SwG_SS)_PF2(P_NESY).pdf |
| Summary: | Introduction: The most important parameter needed for
appropriate management of pregnant women is accurate
Gestational Age (GA). Routine sonographic estimation of GA by
using Biparietal Diameter (BPD), Femur Length (FL), Abdominal
Circumference (AC) and Head Circumference (HC) assumed
important role in management of pregnancy. However, these
parameters have limitations. BPD and HC are not reliable in
case of moulding of foetal head in third trimester. Similarly, femur
length is shortened in cases of achondroplasia. Transcerebellar
Diameter (TCD) was developed as an alternative parameter of
foetal brain growth and for estimation of GA.
Aim: To evaluate accuracy of predicting GA using Foetal
Transcerebellar Diameter (TCD) and to compare between TCD
and other existing parameters in evaluating GA in 15 to 40
weeks of gestation.
Materials and Methods: A prospective study was carried out
in 100 pregnant women between 15 to 40 weeks of gestation,
who came for routine antenatal sonography. Transcerebellar
diameter was measured along with routine parameters. Subjects
were divided into two groups based on GA (15-28 and 29-40
weeks). Gestational age using TCD and other parameters was
calculated and compared with gestational age based on Last
Menstrual Period (LMP). Correlation between the GA by LMP
with GA by other ultrasound parameters was done by using Karl
Pearson’s Correlation(r).
Results: In 15-28 weeks, all parameters had nearly equal
r-values. Among all parameters, TCD revealed highest correlation
with value of 0.997. In 29-40 weeks, there was considerable
difference in r-values. An r-value of 0.982 was noted, when the
GA by TCD and LMP was compared, r-value of which is more
than the other parameters. The least correlation was seen with
BPD, r=0.951. The second most accurate correlation was seen
with the FL with r-value of 0.981.
Conclusion: TCD is an accurate parameter in estimation of
gestational age in second and third trimesters as its values are
in close relation with that of GA by LMP. It is also better predictor
of the gestational age when compared to other parameters
especially in third trimester. |
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| ISSN: | 2249-782X 0973-709X |