The most highly oxygenated blood in fetal circulation is carried by - ANSWER ductus
venosus
If fetal arterial pressure begins to fall below normal levels - ANSWER baroreceptors cause
vasoconstriction and increase FHR
Fetal heart rate variability is defined as fluctuations in the baseline that are irregular in
_________ and __________. - ANSWER amplitude and frequency
An increase in FHR immediately preceding a variable deceleration is caused by: - AN-
SWER occlusion of the umbilical vein
When assessing a FHR tracing, the first step is to - ANSWER establish a baseline rate
Which deceleration in the FHR is considered benign and does not require an intervention to
correct? - ANSWER early deceleration
If the umbilical vein is the only vessel occluded during cord compression - ANSWER oxy-
genated blood may be restricted from being delivered to the fetus
During fetal sleep cycle, FHR variability is usually - ANSWER minimal
Uterine tachysystole is defined as - ANSWER < 5 contractions in 10 minutes averaged
over 30 minutes
1
, Maternal-fetal oxygen and nutrient transfer takes place in the - ANSWER intervillous
space
During a contraction, the toco detects - ANSWER pressure created by the tensing of uter-
ine muscles
Normal FHR baseline is - ANSWER 110-160
Following birth, a fetal cord blood sample is taken. The results are:
pH: 6.95
pCO2: 86 mmHg
pO2: 4 mmHg
BE: -18.6 mEq/L
These results are best interpreted as: - ANSWER mixed acidemia
A characteristic of variable decelerations is: - ANSWER the onset of the deceleration is
abrupt
stimulation of the vagus nerve in a healthy fetus will cause - ANSWER a decrease in the
FHR
Assess the tracing. What is the baseline rate? - ANSWER 145
Assess the tracing. What is the correct interpretation? - ANSWER Baseline of 160bpm
with recurrent late decelerations
Assess the tracing: what is the primary physiologic goal? - ANSWER maximize oxygena-
tion
2
venosus
If fetal arterial pressure begins to fall below normal levels - ANSWER baroreceptors cause
vasoconstriction and increase FHR
Fetal heart rate variability is defined as fluctuations in the baseline that are irregular in
_________ and __________. - ANSWER amplitude and frequency
An increase in FHR immediately preceding a variable deceleration is caused by: - AN-
SWER occlusion of the umbilical vein
When assessing a FHR tracing, the first step is to - ANSWER establish a baseline rate
Which deceleration in the FHR is considered benign and does not require an intervention to
correct? - ANSWER early deceleration
If the umbilical vein is the only vessel occluded during cord compression - ANSWER oxy-
genated blood may be restricted from being delivered to the fetus
During fetal sleep cycle, FHR variability is usually - ANSWER minimal
Uterine tachysystole is defined as - ANSWER < 5 contractions in 10 minutes averaged
over 30 minutes
1
, Maternal-fetal oxygen and nutrient transfer takes place in the - ANSWER intervillous
space
During a contraction, the toco detects - ANSWER pressure created by the tensing of uter-
ine muscles
Normal FHR baseline is - ANSWER 110-160
Following birth, a fetal cord blood sample is taken. The results are:
pH: 6.95
pCO2: 86 mmHg
pO2: 4 mmHg
BE: -18.6 mEq/L
These results are best interpreted as: - ANSWER mixed acidemia
A characteristic of variable decelerations is: - ANSWER the onset of the deceleration is
abrupt
stimulation of the vagus nerve in a healthy fetus will cause - ANSWER a decrease in the
FHR
Assess the tracing. What is the baseline rate? - ANSWER 145
Assess the tracing. What is the correct interpretation? - ANSWER Baseline of 160bpm
with recurrent late decelerations
Assess the tracing: what is the primary physiologic goal? - ANSWER maximize oxygena-
tion
2
