The maternity nurse understands that as the uterus contracts during labor, maternal-fetal exchange of oxygen and waste products:
Is not significantly affected.
Increases as blood pressure decreases.
Continues except when placental functions are occluded.
Diminishes as the spiral arteries are compressed.
The Correct Answer is D
Choice A rationale
The maternal-fetal exchange of oxygen and waste products is affected by uterine contractions, as these compress the placental blood vessels, temporarily reducing blood flow.
Choice B rationale
Blood pressure variations during labor can influence perfusion but do not increase maternal-fetal exchange as uterine contractions primarily cause transient vascular compression.
Choice C rationale
Maternal-fetal exchange continues during contractions except when the uterine pressure is high enough to occlude placental blood flow, temporarily halting the exchange.
Choice D rationale
Uterine contractions compress the spiral arteries, reducing blood flow through the placenta, thereby diminishing maternal-fetal exchange of oxygen and waste products during contractions.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Paceritation is a term not commonly recognized in obstetrics. It lacks clinical relevance and does not correlate with increased risk during labor when membranes rupture.
Choice B rationale
Shoulder dystocia occurs during delivery when the baby's shoulder gets stuck after the head is delivered. It is unrelated to ruptured membranes and does not increase the associated risk.
Choice C rationale
Infection risk increases significantly after membranes rupture due to potential bacterial entry into the uterine cavity. Normal WBC count is 4,000-11,000 cells/mcL.
Choice D rationale
Meconium aspiration occurs when the newborn inhales meconium-stained amniotic fluid, typically in post-term pregnancies or fetal distress. It is not directly linked to ruptured membranes.
Correct Answer is C
Explanation
Choice A rationale
Drinking as much as desired, even in the second trimester, can lead to fetal alcohol spectrum disorders. No safe amount of alcohol is known during pregnancy.
Choice B rationale
Despite being in the second trimester, no level of alcohol consumption is considered safe during pregnancy, as it poses a risk to fetal development.
Choice C rationale
The safest course is to abstain from alcohol throughout pregnancy as no specific amount has been deemed safe and it can cause irreversible harm to fetal development.
Choice D rationale
Even limiting alcohol consumption to three times a week poses a risk to fetal health, as any amount can potentially cause developmental issues.
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