OB 510

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Author:
lstaal1
ID:
22583
Filename:
OB 510
Updated:
2010-06-08 15:52:24
Tags:
Module15
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Description:
Obstetrical Doppler
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  1. When should doppler use be avoided?
    1st trimester
  2. Used for obstetrical doppler are: (5)
    • 1. Maternal vessels
    • 2. Fetal Vessels
    • 3. Fetal ductus venosus
    • 4. Fetal heart
    • 5. Placenta
  3. What are the 2 basic types of doppler us?
    • CW
    • PW
  4. With increasing GA there is a __________________ in the S/D ratio.
    decline
  5. How do you calculate Resistive Index?
    S-D / S
  6. How do you calculate PI?
    S-D / mean
  7. As the vascular resistance increases what happens to the:
    S/D?
    PI?
    They both increase
  8. What happens to the PI as the GA increases?
    declines
  9. In normal pregnancies, the umbilical vein venous flow is _________________.
    ____________ velocity.
    _____________ during fetal breathing.
    • constant
    • low
    • variation
  10. Some factors related to reduced blood flow to placenta: (4)
    • smoking
    • maternal hypertension
    • various drugs
    • poor nutrition
  11. What would happen to diastolic velocity if placental resistance increased?
    reduce
  12. How is the resistance arrangement when IUGR head sparing occurs?
    • increased resistance AO & umbilical artery
    • decreased resistance in fetal middle cerebral artery
  13. Which fetal vessel is studied the most extensively?
    Umbilical artery
  14. The umbilical artery has ______________ resistance flow.
    low
  15. Increase in fetal HR causes ______________ in pulsatility.
    decrease
  16. Umbilical Artery: S/D ratio <3.0 is normal? T/F
    T
  17. Umbilical Artery:
    Normal RI=?
    <0.7
  18. Risks associated with abnormal S/D ratio include:
    • preterm delivery
    • decreased birthweight
    • decreased amniotic fluid
    • SGA
    • Risks associated with admission to NICU
  19. When assessing umbilical artery you should locate a spot close to fetal abdomen/placenta?
    fetal abdomen
  20. ___________ or ___________ of diastolic flow is a significant finding and indicates placental ____________.
    • absence or reversal
    • impedence
  21. Elevated S/D ratios are associated with: (3)
    • abnormal karyotype
    • maternal HTN
    • severe growth restriction
  22. Fetal doppler of MCA is used to detect "________ _______ ______"
    brain sparing effect
  23. MCA has _______ cerebral blood flow and little diastolic flow
    80%
  24. MCA PI = ?
    >1.45
  25. MCA acronym HABS stands for
    • Heart
    • Adrenal
    • Brain
    • Sleen
  26. Which are the highest velocities found in fetal cardiovascular system?
    • ductus arteriosus
    • 50-140

    • Diastolic 6-30cm/sec
    • Flow Rt to Lt
  27. Maternal uterine artery gives off branches near ?
    Runs?
    • internal os
    • sup lat along corpus

    ant ---> external iliac
  28. When do you sample MUA?
    16-22 weeks
  29. After 12 weeks the MUA has a ____________resistance flow pattern
    low
  30. What is an abnormal S/D ratio of MUA?
    >2.6

    above indicates increased vascular resistance and decreased blood supply to uterus

    notching on diastolic is bad
  31. MUA normal PI? RI ?
    • PI = .82
    • RI = 4.7
  32. What may be one of the earliest signs of IUGR especially if there is maternal HTN?
    arcuate artery with reduced flow
  33. Umbilical artery & vein reflect changes in the _______________ vascular bed.
    placental
  34. How many weeks before fetus appears to be in trouble may doppler parameters become abnormal?
    4 or more
  35. Studies have shown that ___________________ as part of the OB management has resulted in a reduction of emergency c-sections?
    doppler
  36. In severe PIH doppler studies correlate well with _______ ______.
    fetal distress
  37. You can see doppler changes 24hrs before/after nonstress test?
    before
  38. In discordant twins, doppler has/has not proven to be more useful than EFW.
    has not
  39. With cardiac anomalies, doppler can gage systolic function by measuring: (3)
    • aortic volume
    • systolic velocities
    • AT
  40. Smoking can increase maternal HR and BP therefore increasing fetal ____________ and _____________blood flow
    • aortic
    • umbilical
  41. Doppler of umbilical artery that is suggestive of distress or compromise would be?
    absent or reversal of flow

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