A nurse explains fetal positioning. When does the fetus usually move head-down?
Week 32
Week 34
Week 36
Week 30
The Correct Answer is C
The fetus typically assumes a cephalic presentation, or head-down position, as it grows and space within the uterus becomes limited. By late pregnancy, the heavier fetal head naturally gravitates toward the narrower lower uterine segment. Most fetuses achieve this stable orientation by the end of the third trimester.
A. Week 32: At 32 weeks, many fetuses are still mobile and may frequently transition between cephalic, breech, or transverse positions. The amniotic fluid volume is relatively high compared to fetal size, allowing for significant movement. Spontaneous version is very common at this gestational age.
B. Week 34: While the fetus is becoming larger and movement is more restricted, many have not yet settled into the final vertex position. Clinicians monitor positioning but generally wait until closer to term before considering external cephalic version. It is a transitional period for fetal orientation.
C. Week 36: By the 36th week, approximately 95% of fetuses have turned head-down to prepare for engagement in the pelvic inlet. The reduced space and increasing fetal weight make further spontaneous rotation unlikely after this point. This is the standard time for confirming the presenting part.
D. Week 30: During the early third trimester, the fetus is still quite active and often changes its longitudinal axis daily. A breech presentation at 30 weeks is considered a normal finding and does not typically require medical intervention. The fetus has ample room to rotate.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Hyperemesis gravidarum is a severe complication characterized by intractable vomiting leading to fluid-electrolyte imbalance, ketonuria, and weight loss exceeding 5% of pre-pregnancy mass. The pathophysiology involves high serum hCG levels and potential hyperthyroidism. Patients exhibit signs of intravascular dehydration and metabolic alkalosis.
A. Iron deficiency: While anemia is common in pregnancy, it typically presents with fatigue and pallor rather than acute, persistent emesis and significant weight loss. Iron supplements can actually exacerbate gastric irritation and nausea. It is not the primary cause of the severe hemodynamic instability described here.
B. Hyperemesis gravidarum: The combination of 6-pound weight loss, persistent inability to retain nutrients, and orthostatic dizziness indicates a pathological state beyond normal morning sickness. This condition requires aggressive intravenous rehydration and electrolyte replacement. Dark urine and dizziness are clinical hallmarks of severe volume depletion.
C. Gastroenteritis: An acute infection of the digestive tract usually presents with diarrhea, fever, and abdominal cramping alongside vomiting. While it causes temporary dehydration, the 10-week gestational timing and lack of lower gastrointestinal symptoms point toward a pregnancy-induced etiology. It is typically a self-limiting viral or bacterial event.
D. Normal morning sickness: Physiological nausea of pregnancy usually peaks in the morning and does not result in significant weight loss or clinical dehydration. Clients can typically maintain some oral intake and do not experience dizziness upon standing. It lacks the severe metabolic consequences seen in hyperemesis.
Correct Answer is A
Explanation
Hyperemesis gravidarum is a severe complication characterized by intractable emesis leading to 5% weight loss and ketonuria. The pathophysiology is linked to rapidly rising human chorionic gonadotropin levels and estrogen. Complications include Wernicke encephalopathy and electrolyte imbalance if untreated.
A. Control nausea and hydration: Restoration of fluid volume and electrolyte balance is the vital first step to prevent renal failure and cardiac arrhythmias. Pharmacological management focuses on suppressing the vomiting reflex to allow for oral intake. This addresses the immediate life-threatening dehydration.
B. Deliver early: Premature induction is not a primary treatment for a condition that typically peaks in the first trimester and often resolves. Management aims to sustain the pregnancy until fetal maturity is reached safely. Delivery is only considered in extreme, refractory cases.
C. Stop hormones: Therapeutic suppression of pregnancy hormones is impossible without terminating the pregnancy, as they are essential for gestational maintenance. There are no targeted therapies that safely "stop" these hormones during a viable pregnancy. Treatment focuses on symptom management instead.
D. Cure condition: Because the etiology is fundamentally linked to the physiological state of pregnancy, a definitive "cure" is rarely achievable before parturition. Clinical efforts are directed at management and harm reduction until the condition naturally wanes. Goals remain supportive rather than curative.
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