[Estimating the peripheral vascular resistance of the aorta of fetal sheep by external Doppler ultrasound diagnosis].
OBJECTIVE
Do external Doppler indices correlated sufficiently to the peripheral resistance?


METHODS
The resistance of 7 fetal sheep was measured inductively and was correlated to external Doppler measurements. The correlation of different indices and methods was compared.


RESULTS
Only bloodflow velocities and the harmonic component index (HCI) yield good correlations (r > or = 7) to the peripheral resistance. PI, RI, S/D-Ratio and Vpeak/Vmean showed r-values from .47 to .59. None of the Doppler parameters reached the values of indices derived from the inductive flow probe.


CONCLUSIONS
The blood flow velocities and the HCI seem to be superior to the classical indices in estimation of blood flow in the fetal aorta.
Rybakowski
C
C
Abteilung für experimentelle Medizin, Universitätsfrauenklinik Hamburg.
Schröder
H J
HJ
Büge
G
G
Hüneke
B
B
Cetin
E
E
D000818:Animals; D001011:Aorta / Q000000981:diagnostic imaging* / Q000196:embryology; D001783:Blood Flow Velocity / Q000502:physiology; D005260:Female; D011247:Pregnancy; D012016:Reference Values; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D012984:Software; D018608:Ultrasonography, Doppler / Q000295:instrumentation; D016216:Ultrasonography, Prenatal / Q000295:instrumentation; D014655:Vascular Resistance / Q000502:physiology*
Abschätzung des peripheren Gefässwiderstandes in der Aorta des fetalen Schafes durch externe Dopplersonographie.