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Fetal ophthalmic artery blood flow velocity waveforms
1Department of Obstetrics and Gynecology, Osaka Gyohmeikan Hospital, Japan.
Gynecologic and Obstetric Investigation
|January 1, 1996
Summary
This study shows how fetal ophthalmic artery (OA) vascular impedance changes during pregnancy. These findings help assess fetal eye circulation in normal and abnormal pregnancies.
Area of Science:
- Fetal Medicine
- Vascular Physiology
- Diagnostic Ultrasound
Background:
- Vascular impedance in fetal circulation is crucial for assessing well-being.
- The ophthalmic artery (OA) is a key vessel in fetal ocular circulation.
- Limited data exists on the normal progression of OA vascular impedance during gestation.
Purpose of the Study:
- To characterize the changes in vascular impedance of the fetal ophthalmic artery (OA) throughout pregnancy.
- To establish normative data for OA vascular impedance.
- To provide a basis for evaluating fetal ocular circulation.
Main Methods:
- Utilized Color Doppler and pulsed Doppler ultrasonography in 28 normal fetuses.
- Assessed fetuses between 21 and 40 weeks of gestation.
- Calculated pulsatility index (PI) for the OA and middle cerebral artery (MCA), determining regression models.
Main Results:
- Vascular impedance in the OA followed a parabolic pattern with advancing gestation, similar to the MCA.
- Predicted PI values for the OA were consistently lower than those for the MCA.
- Established normal ranges for PI values in both the OA and MCA.
Conclusions:
- This research is the first to document gestational alterations in fetal OA vascular impedance.
- The findings offer a foundational dataset for assessing fetal ocular vascular health.
- These data are essential for identifying potential abnormalities in fetal circulation.