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Pulsatility index of the middle cerebral artery in normal fetuses
Ratana Komwilaisak1, Piyamas Saksiriwuttho, Thawalwong Ratanasiri
1Department of Obstetrics and Gynecology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand.
Objective:
To establish the reference ranges of the middle cerebral artery pulsatility index (MCA PI) in normal fetuses between 20 and 37 weeks gestation.
Study Design:
A descriptive study.
Setting:
Antenatal Care Clinic, Outpatient department, Faculty of Medicine, Srinagarind Hospital, Khon Kaen University.
Subjects:
At least sixteen women of each gestational age with an uncomplicated singleton pregnancy between 20 and 37 weeks gestation.
Method:
All recruited pregnant women were enrolled for abdominal Doppler ultrasonography to determine fetal MCA PI for each week of gestational age.
Main Outcome Measures:
The MCA PI reference range for normal fetuses between 20 and 37 completed weeks of gestation.
Results:
The MCA PI decreased as gestational age advanced from 1.97 (SD 0.48) at 20 weeks to 1.15 (SD 0.18) at 37 weeks.
Conclusion:
We established the reference ranges of the fetal MCA PI for reference use in our Antenatal Care Clinic.
