A 30-year-old pregnant woman is in labor, and the obstetrician suspects that there might be a complication with the progression of labor due to the fetus. Which fetal issue is most likely causing this complication?
Small for gestational age.
Fetal macrosomia.
Intrauterine growth restriction.
Fetal anemia.
The Correct Answer is B
Choice B rationale
Fetal macrosomia, defined as birth weight above 4,000 grams, can complicate labor due to increased risk of shoulder dystocia, prolonged labor, and cesarean delivery. Proper management of macrosomia is critical for maternal and neonatal outcomeChoice s.
Choice A rationale
Small for gestational age (SGA) fetuses, although growth-restricted, typically do not pose mechanical issues in labor. The primary concerns involve potential preterm birth, low birth weight, and associated neonatal complications, not labor obstruction.
Choice C rationale
Intrauterine growth restriction (IUGR) fetuses are smaller than expected for gestational age but do not generally cause labor obstruction. IUGR primarily raises concerns about fetal well-being and potential complications, not mechanical labor issues.
Choice D rationale
Fetal anemia, although serious, does not typically affect the mechanical aspects of labor progression. It can lead to fetal hypoxia and distress, requiring close monitoring and potentially earlier delivery, but not labor complications related to size.
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Related Questions
Correct Answer is B
Explanation
Choice A rationale
Prostaglandins are involved in labor but primarily act to ripen the cervix and induce uterine contractions, not prolong labor. They are produced by the fetus and placenta during pregnancy.
Choice B rationale
Catecholamines, such as epinephrine and norepinephrine, are released in response to stress and anxiety, leading to vasoconstriction, reduced blood flow to the uterus, and prolonged labor. They are produced by the adrenal glands.
Choice C rationale
Oxytocin is a hormone that stimulates uterine contractions and accelerates labor. It is often administered to induce or augment labor, rather than prolong it. It is produced in the hypothalamus.
Choice D rationale
Orexin, also known as hypocretin, is involved in regulating arousal, wakefulness, and appetite, but has no direct role in labor. It is produced in the hypothalamus.
Correct Answer is A
Explanation
Choice A rationale
Amniocentesis detects anomalies in fetal chromosomes by analyzing amniotic fluid cells. It identifies genetic disorders like Down syndrome. Normal karyotype excludes major chromosomal abnormalities.
Choice B rationale
Rh incompatibility is identified by maternal blood tests, not amniocentesis. Blood type and antibody screening determine Rh status and risk of hemolytic disease in the fetus.
Choice C rationale
Cephalopelvic disproportion is assessed clinically and via ultrasound. It involves the pelvis and fetal head sizes, not amniocentesis.
Choice D rationale
Amniocentesis can detect infections, but this is not its primary purpose. Polymerase chain reaction (PCR) identifies bacterial or viral DNA/RNA.
Choice E rationale
Amniocentesis detects neural tube defects like spina bifida by measuring alpha-fetoprotein (AFP) levels in amniotic fluid. Elevated AFP suggests neural tube defects.
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