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Published on: February 23, 2020
Z-score model of foetal ascending aorta diameter distensibility
Fuli Chen1,2, Shi Zeng1, Aijiao Yi2
1Department of Ultrasound Diagnosis, The Second Xiangya Hospital, Central South University, Changsha, China.
Objective:
The purpose of this study is to establish Z-scores models of normal fetal ascending aorta diameter and diameter distensibility.
Methods:
The maximum systolic diameter (Dmax), minimum diastolic diameter (Dmin), and diameter distensibility of the sinotubular junction were measured and taken as dependent variables in 490 normal fetuses at 18-40 gestational weeks, and gestational age (GA), biparietal diameter (BPD), and femoral length (FL) were taken as independent variables. The data were subjected to regression analysis, and the best-fitting equations for the dependent variables based on the independent variables were determined. The fitting equations were then applied to construct the Z-scores models.
Results:
The Dmax, Dmin and Diameter Distensibility in normal fetuses between 18 and 40 weeks of GA could be evaluated by utilizing the Z-scores models. Dmax and Dmin increased significantly with increasing GA, BPD, and FL. Diameter distensibility, assessed as (Dmax-Dmin)/Dmin, decreased significantly with increasing GA, BPD, and FL.
Conclusion:
The Z-scores are valuable, and can be utilized as a potent supplement to the conventional approach as they can indirectly reflect the development of fetal ascending aortic elastic property.
