fetal circ and doppler

Question 1

Umbilical Artery (UA) Doppler

Spectral waveform affected by were sample is taken (higher at fetal or placenta end?)

Answer 1

fetal end

Question 2

Umbilical Artery (UA) Doppler

Where will changes to doppler be affected first

Answer 2

Changes will be seen at fetal end first.

Question 3

Umbilical Artery (UA) Doppler

Normal impedance of flow should be high/low resistance.

Answer 3

low resistance

Question 4

Low/high resistance seen in first trimester.

Answer 4

high resistance

Question 5

Umbilical artery impedance indices will decrease/increase when there is a decrease in placental perfusion.

Answer 5

increase

Question 6

Question 7

normal Umbilical Artery waveform has a _____________ appearance

Answer 7

saw tooth

Question 8

Additional Doppler Assessment Needed If UA Doppler Is Abnormal

Answer 8

Fetal Middle Cerebral Artery
Ductus Venosus
Umbilical Vein
Uterine Artery

Question 9

MCA in normal situation has a low-resistance or high-resistance, (minimal fetal diastolic antegrade flow).

Answer 9

high resistance

Question 10

During pathologic states, MCA will become more low-resistance or high-resistance, following fetal head sparing theory.

Severe cerebral edema can cause high-resistance waveform, resulting in poor prognosis.

Answer 10

low resistance

Question 11

what kind of waveform does Ductus Venosus (DV) have

Answer 11

triphasic

Question 12

what kind of waveform is umbilical vein

Answer 12

monophasic

Question 13

what does pulsatile in umbilical vein in first trimester mean,

Answer 13

chromosomal abnormality may be suspected

Question 14

Adverse outcome associated with:

Umbilical artery- S/D ratio > 3.0 after 30 wks, (check for decreased, absent, or reversed end-diastolic flow)

Uterine artery- PI > 1.5 with detection of an early notch

Ductus venosus- increased RI; absent or reversed flow during atrial contraction

Middle cerebral artery- decreased PI (brain sparing effect)