[Doppler measurements of blood flow in the middle cerebral artery for the diagnosis of fetal anemia].
OBJECTIVE
This paper presents a possibility of non-invasive diagnosis of fetal anemia based on the Doppler assessing of peak systolic velocity (PSV) in the fetal middle cerebral artery. The results of Doppler measurements were compared with fetal peripheral blood count estimated after cordocentesis.


METHODS
Doppler measurements of blood flow velocity in the fetal middle cerebral artery were performed in years 2000 and 2001 in 22 pregnancies complicated by maternal blood group alloimmunisation. Gestation age varied from 27 to 36 weeks, the mean gestation age was 32 weeks. Depending on hemoglobin concentration in the fetal blood sample the severity of anemia was divided into three groups: severe anemia (Hb = < 7 g%), middle (Hb = = 8-10 g%) and light (Hb = = 10-12 g%). The fourth group consisted of fetuses without anemia (Hb > 12 g%). The results were statistically analyzed to estimate correlation between the Doppler blood flow indexes (PI, RI, SD and PSV) in the middle cerebral artery and the peripheral blood count (Hb, Ht, erythrocyte count) of fetal blood received by cordocentesis. Using T-Student-test the differences of average maximal blood flow velocities and mean Doppler indexes in the group of fetuses with severe anemia (Hb < 7 g%) and fetuses without anemia (Hb > 12 g%) were compared.


RESULTS
Highest (negative) correlation was found between the peak systolic velocity and the fetal hemoglobin concentration. The correlation index was -0, 85, which means the higher the peak systolic velocity the lower the hemoglobin concentration. The difference between the mean peak systolic velocity in the group of fetuses with severe anemia and the group without anemia was statistically significant (p < 0.001). However, there was no statistical significant difference in the mean peak systolic velocity between the group with middle anemia (Hb = 10-12 g%) and the group without anemia (Hb > 12 g%).


CONCLUSIONS
Doppler ultrasonography with the measurement of peak systolic velocity in the middle cerebral artery is a good method in evaluating of fetal peripheral blood count. Non-invasive peak systolic velocity measurements in the middle cerebral artery allow to assess the fetal hemoglobin concentration and also to reduce the count of diagnostic cordocentesis.
Kowalczyk
Dariusz
D
Oddziału Patologii Ciazy Wojewódzkiego Szpitala Ginekologiczno-Połozniczego im dr. S. Mossora w Opolu.
Guzikowski
Wojciech
W
Kubicki
Janusz
J
Maczka
Marek
M
D000743:Anemia, Hemolytic / Q000000981:diagnostic imaging; D001783:Blood Flow Velocity; D001789:Blood Group Antigens / Q000276:immunology; D016022:Case-Control Studies; D017218:Cordocentesis; D004899:Erythroblastosis, Fetal / Q000000981:diagnostic imaging* / Q000276:immunology* / Q000503:physiopathology; D005069:Evaluation Studies as Topic; D005260:Female; D005312:Fetal Blood / Q000276:immunology*; D005865:Gestational Age; D006801:Humans; D020768:Middle Cerebral Artery / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011250:Pregnancy Complications, Hematologic / Q000000981:diagnostic imaging* / Q000276:immunology; D012016:Reference Values; D012203:Rh Isoimmunization / Q000150:complications; D012307:Risk Factors; D012680:Sensitivity and Specificity; D018617:Ultrasonography, Doppler, Pulsed / Q000379:methods; D016216:Ultrasonography, Prenatal
D001789:Blood Group Antigens