Maternal-Newborn ATI Proctored Exam
Advanced Prep: Master High-Stakes
Obstetrical and Neonatal Nursing Practice
Questions & Detailed Explanations
Subject / Subtopic for Questions 1-30: Comprehensive Maternal-Newborn
Nursing (Advanced Practice)
Question 1: A nurse is assessing a client at 36 weeks of gestation who has been receiving
magnesium sulfate via continuous IV infusion for preeclampsia with severe features. The client's
total hourly intake is 125 mL. Which of the following findings should the nurse identify as the
most reliable early indicator of impending magnesium toxicity?
A) Absence of patellar deep tendon reflexes.
B) Decrease in respiratory rate from 16/min to 11/min.
C) Urinary output of 25 mL over the past hour.
D) Decrease in a previously hyperactive patellar reflex to 1+.
Correct Answer: D) Decrease in a previously hyperactive patellar reflex to 1+.
Explanation: The loss or depression of deep tendon reflexes (DTRs) is the earliest clinical sign of
magnesium sulfate toxicity, occurring at therapeutic-to-toxic serum thresholds (typically 7 to 10
mEq/L). A sudden decrease from baseline hyperactive reflexes (e.g., 3+ or 4+) to a sluggish 1+
signifies CNS depression before complete absence (0) occurs. Respiratory depression (<12/min)
is a later, more severe sign occurring at higher serum levels (11 to 15 mEq/L). Low urinary
output (<30 mL/hr) is a cause of toxicity due to decreased renal excretion, not a physiological
manifestation of toxicity itself.
Question 2: A nurse in the labor and delivery unit is reviewing the internal electronic fetal
monitoring tracing of a client in active labor with an intrauterine pressure catheter (IUPC) in
place. The nurse notes a gradual decrease in the fetal heart rate (FHR) baseline that begins 30
seconds after the onset of a contraction, reaches its nadir well after the peak of the contraction,
and returns to baseline 40 seconds after the contraction has concluded. Which of the following
cellular-level events is occurring in the fetus?
A) Transient baroreceptor-mediated vagal response from intracranial pressure.
B) Functional chemoreceptor stimulation secondary to metabolic hypoxemia.
,C) Sudden cord occlusion leading to a transient surge in fetal systemic blood pressure.
D) Parasympathetic baseline adjustment from physiological sleep cycles.
Correct Answer: B) Functional chemoreceptor stimulation secondary to metabolic
hypoxemia.
Explanation: The tracing describes a late deceleration, which is caused by uteroplacental
insufficiency. When uterine contractions compress maternal spiral arteries, placental perfusion
drops. If fetal oxygen reserves are low, this causes transient fetal hypoxemia, triggering
peripheral chemoreceptors to stimulate a sympathetic-parasympathetic response that slows the
heart rate to preserve myocardial oxygenation. Head compression (early decelerations) triggers
a vagal reflex via baroreceptors. Cord compression (variable decelerations) causes sudden
umbilical artery occlusion and systemic hypertension.
Question 3: A nurse is caring for a postpartum client 2 hours after a precipitous vaginal delivery
of a 4,500 g (9 lb 14 oz) infant. The nurse notes that the fundus is firm, midline, and located two
fingerbreadths below the umbilicus. However, there is a continuous, slow trickle of bright red
vaginal bleeding. Which of the following complications should the nurse suspect?
A) Subinvolution of the placental site.
B) Retained placental fragments.
C) Laceration of the birth canal.
D) Disseminated intravascular coagulation (DIC).
Correct Answer: C) Laceration of the birth canal.
Explanation: A continuous trickle of bright red blood in the presence of a firm, well-contracted
uterus is the classic clinical presentation of a laceration of the cervix, vagina, or perineum.
Precipitous labor and fetal macrosomia are major risk factors for birth canal trauma. Retained
placental tissue and subinvolution typically cause uterine atony, presenting as a soft, boggy, or
displaced uterus. DIC would present with widespread oozing from venipuncture sites, petechiae,
and profound shock, rather than a localized, steady trickle with a firm fundus.
Question 4: A nurse is evaluating the laboratory profile of a client at 34 weeks of gestation who
presents with severe right upper quadrant pain, malaise, and vision changes. The results show:
Platelets 74,000/mm³, Aspartate Aminotransferase (AST) 145 units/L, Alanine Aminotransferase
(ALT) 130 units/L, and a peripheral blood smear revealing schistocytes. Which of the following
pathophysiological processes drives these findings?
A) Immunological destruction of platelets by maternal autoantibodies.
B) Microvascular endothelial cell damage and fibrin deposition.
, C) Acute biliary obstruction and localized hepatic ischemia.
D) Severe intrahepatic cholestasis with systemic bile acid accumulation.
Correct Answer: B) Microvascular endothelial cell damage and fibrin deposition.
Explanation: The client’s presentation and lab findings (low platelets, elevated liver enzymes,
and schistocytes indicating hemolysis) are diagnostic of HELLP syndrome. The primary
pathophysiology of HELLP is severe endothelial dysfunction and vasospasm, leading to
microvascular endothelial cell damage. Fibrin networks deposit within small vessels, shredding
red blood cells as they pass through (causing hemolysis and schistocytes) and consuming
platelets. This is not driven by autoantibodies (like ITP), bile duct obstruction, or benign
cholestasis.
Question 5: A nurse is managing the care of a client at 39 weeks of gestation who is receiving an
oxytocin infusion for labor induction. The intrauterine pressure catheter (IUPC) reveals a uterine
contraction frequency of 6 contractions in a 10-minute period, with each contraction lasting 75 to
80 seconds. The fetal heart rate tracing exhibits moderate variability with no decelerations.
Which of the following actions should the nurse take first?
A) Discontinue the oxytocin infusion immediately.
B) Decrease the oxytocin infusion rate by half.
C) Administer terbutaline 0.25 mg subcutaneously.
D) Position the client in a left lateral recumbent position.
Correct Answer: B) Decrease the oxytocin infusion rate by half.
Explanation: The client is experiencing uterine tachysystole (>5 contractions in 10 minutes).
According to evidence-based guidelines, if the fetal heart rate tracing remains reassuring
(Category I: moderate variability, no decelerations), the oxytocin dose should be titrated
downward or cut in half rather than completely stopped. Complete discontinuation is mandatory
if there is an associated non-reassuring (Category II or III) FHR pattern. Terbutaline is a
tocolytic reserved for tachysystole accompanied by abnormal FHR patterns unresponsive to
oxytocin reduction.
Question 6: A nurse is assessing a 4-hour-old newborn who was delivered at 38 weeks of
gestation via elective cesarean section without labor. The nurse notes an expiratory grunt, nasal
flaring, and a respiratory rate of 76/min. Skin color is pink with mild acrocyanosis. The nurse
should anticipate that a chest X-ray will reveal which of the following?
A) Hyperinflation with patchy infiltrates and a flattened diaphragm.
B) Fluid in the interlobar fissures with mild cardiomegaly.
Advanced Prep: Master High-Stakes
Obstetrical and Neonatal Nursing Practice
Questions & Detailed Explanations
Subject / Subtopic for Questions 1-30: Comprehensive Maternal-Newborn
Nursing (Advanced Practice)
Question 1: A nurse is assessing a client at 36 weeks of gestation who has been receiving
magnesium sulfate via continuous IV infusion for preeclampsia with severe features. The client's
total hourly intake is 125 mL. Which of the following findings should the nurse identify as the
most reliable early indicator of impending magnesium toxicity?
A) Absence of patellar deep tendon reflexes.
B) Decrease in respiratory rate from 16/min to 11/min.
C) Urinary output of 25 mL over the past hour.
D) Decrease in a previously hyperactive patellar reflex to 1+.
Correct Answer: D) Decrease in a previously hyperactive patellar reflex to 1+.
Explanation: The loss or depression of deep tendon reflexes (DTRs) is the earliest clinical sign of
magnesium sulfate toxicity, occurring at therapeutic-to-toxic serum thresholds (typically 7 to 10
mEq/L). A sudden decrease from baseline hyperactive reflexes (e.g., 3+ or 4+) to a sluggish 1+
signifies CNS depression before complete absence (0) occurs. Respiratory depression (<12/min)
is a later, more severe sign occurring at higher serum levels (11 to 15 mEq/L). Low urinary
output (<30 mL/hr) is a cause of toxicity due to decreased renal excretion, not a physiological
manifestation of toxicity itself.
Question 2: A nurse in the labor and delivery unit is reviewing the internal electronic fetal
monitoring tracing of a client in active labor with an intrauterine pressure catheter (IUPC) in
place. The nurse notes a gradual decrease in the fetal heart rate (FHR) baseline that begins 30
seconds after the onset of a contraction, reaches its nadir well after the peak of the contraction,
and returns to baseline 40 seconds after the contraction has concluded. Which of the following
cellular-level events is occurring in the fetus?
A) Transient baroreceptor-mediated vagal response from intracranial pressure.
B) Functional chemoreceptor stimulation secondary to metabolic hypoxemia.
,C) Sudden cord occlusion leading to a transient surge in fetal systemic blood pressure.
D) Parasympathetic baseline adjustment from physiological sleep cycles.
Correct Answer: B) Functional chemoreceptor stimulation secondary to metabolic
hypoxemia.
Explanation: The tracing describes a late deceleration, which is caused by uteroplacental
insufficiency. When uterine contractions compress maternal spiral arteries, placental perfusion
drops. If fetal oxygen reserves are low, this causes transient fetal hypoxemia, triggering
peripheral chemoreceptors to stimulate a sympathetic-parasympathetic response that slows the
heart rate to preserve myocardial oxygenation. Head compression (early decelerations) triggers
a vagal reflex via baroreceptors. Cord compression (variable decelerations) causes sudden
umbilical artery occlusion and systemic hypertension.
Question 3: A nurse is caring for a postpartum client 2 hours after a precipitous vaginal delivery
of a 4,500 g (9 lb 14 oz) infant. The nurse notes that the fundus is firm, midline, and located two
fingerbreadths below the umbilicus. However, there is a continuous, slow trickle of bright red
vaginal bleeding. Which of the following complications should the nurse suspect?
A) Subinvolution of the placental site.
B) Retained placental fragments.
C) Laceration of the birth canal.
D) Disseminated intravascular coagulation (DIC).
Correct Answer: C) Laceration of the birth canal.
Explanation: A continuous trickle of bright red blood in the presence of a firm, well-contracted
uterus is the classic clinical presentation of a laceration of the cervix, vagina, or perineum.
Precipitous labor and fetal macrosomia are major risk factors for birth canal trauma. Retained
placental tissue and subinvolution typically cause uterine atony, presenting as a soft, boggy, or
displaced uterus. DIC would present with widespread oozing from venipuncture sites, petechiae,
and profound shock, rather than a localized, steady trickle with a firm fundus.
Question 4: A nurse is evaluating the laboratory profile of a client at 34 weeks of gestation who
presents with severe right upper quadrant pain, malaise, and vision changes. The results show:
Platelets 74,000/mm³, Aspartate Aminotransferase (AST) 145 units/L, Alanine Aminotransferase
(ALT) 130 units/L, and a peripheral blood smear revealing schistocytes. Which of the following
pathophysiological processes drives these findings?
A) Immunological destruction of platelets by maternal autoantibodies.
B) Microvascular endothelial cell damage and fibrin deposition.
, C) Acute biliary obstruction and localized hepatic ischemia.
D) Severe intrahepatic cholestasis with systemic bile acid accumulation.
Correct Answer: B) Microvascular endothelial cell damage and fibrin deposition.
Explanation: The client’s presentation and lab findings (low platelets, elevated liver enzymes,
and schistocytes indicating hemolysis) are diagnostic of HELLP syndrome. The primary
pathophysiology of HELLP is severe endothelial dysfunction and vasospasm, leading to
microvascular endothelial cell damage. Fibrin networks deposit within small vessels, shredding
red blood cells as they pass through (causing hemolysis and schistocytes) and consuming
platelets. This is not driven by autoantibodies (like ITP), bile duct obstruction, or benign
cholestasis.
Question 5: A nurse is managing the care of a client at 39 weeks of gestation who is receiving an
oxytocin infusion for labor induction. The intrauterine pressure catheter (IUPC) reveals a uterine
contraction frequency of 6 contractions in a 10-minute period, with each contraction lasting 75 to
80 seconds. The fetal heart rate tracing exhibits moderate variability with no decelerations.
Which of the following actions should the nurse take first?
A) Discontinue the oxytocin infusion immediately.
B) Decrease the oxytocin infusion rate by half.
C) Administer terbutaline 0.25 mg subcutaneously.
D) Position the client in a left lateral recumbent position.
Correct Answer: B) Decrease the oxytocin infusion rate by half.
Explanation: The client is experiencing uterine tachysystole (>5 contractions in 10 minutes).
According to evidence-based guidelines, if the fetal heart rate tracing remains reassuring
(Category I: moderate variability, no decelerations), the oxytocin dose should be titrated
downward or cut in half rather than completely stopped. Complete discontinuation is mandatory
if there is an associated non-reassuring (Category II or III) FHR pattern. Terbutaline is a
tocolytic reserved for tachysystole accompanied by abnormal FHR patterns unresponsive to
oxytocin reduction.
Question 6: A nurse is assessing a 4-hour-old newborn who was delivered at 38 weeks of
gestation via elective cesarean section without labor. The nurse notes an expiratory grunt, nasal
flaring, and a respiratory rate of 76/min. Skin color is pink with mild acrocyanosis. The nurse
should anticipate that a chest X-ray will reveal which of the following?
A) Hyperinflation with patchy infiltrates and a flattened diaphragm.
B) Fluid in the interlobar fissures with mild cardiomegaly.
