Doppler Parameters of the Fetal Aortic Isthmus Among Women Attending Women's Health Hospital of Assiut University | ||
| Journal of Current Medical Research and Practice | ||
| Volume 10, Issue 4, October 2025, Pages 129-136 PDF (703.51 K) | ||
| Document Type: Original Article | ||
| Authors | ||
| Asia Ali Ahmed Abdelrahman* ; Abdel Ghaffar Mohamed Ahmed; Dina Mohamed Elsayed Habib; Ahmed Mohamed Alaa Eldin Youssef; Sief Eleslam Ahmed Ali | ||
| Obstetrics and Gynecology, Faculty of Medicine, Assiut University, Assiut, Egypt. | ||
| Abstract | ||
| Background: Fetal circulation forms two parallel circuits with two ventricular pumps perfusing one systemic circulation. In this context, the left ventricle supplies the coronary and brachiocephalic circulations, and the right ventricle supplies the subdiaphragmatic circulation and placenta. The aortic isthmus (AoI) is the fetal watershed whose waveform reflects its complex hemodynamic physiology. Many indices exist to quantify the different components of that waveform, including the pulsatility index, resistance index, isthmic flow index, and, recently, the isthmic systolic index. Aim of Work: To establish Doppler parameters of the fetal aortic isthmus. Patients and Methods: A cross-sectional study was conducted on 357 females with singleton pregnancy at the Women's Health Hospital, Assiut University, from 2021 to 2023. Patients signed informed consent. A fetal color Doppler was performed, measuring the pulsatility and resistance indexes. Assiut Faculty of Medicine approved the study. Results: Our study aims to establish reference ranges for the waveforms of blood flow velocity (FVW) in the fetal aortic isthmus. Our study showed that AoI-PI ranged from 0.87 to 11.14 with a mean of 2.34± 1.13, while the AoI-RI ranged from 0.40 to 8.60 with a mean of 0.93± 0.49. At the gestational age of 28 weeks, the mean gestational age in our study was a reference AoI-PI of 2.76 and a reference AoI-RI of 1.35. A regression analysis for PI and RI correlated to advancing gestation showed a significant increase in PI (r=0.12, p=0.022) and a significant weak increase in RI (r=0.11, p=0.037). Conclusion: Our study showed figures that were mainly consistent with other studies worldwide. | ||
| Keywords | ||
| Aortic isthmus; Pulsatility index; Resistive index | ||
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