A nurse is caring for a client with placenta previa. Which of the following is a hallmark symptom of this condition?
Painful uterine contractions and board-like rigidity
Bright red, painless vaginal bleeding
Increased fetal movement and tachycardia
Severe localized abdominal tenderness
The Correct Answer is B
Placenta previa occurs when the placenta implants in the lower uterine segment, partially or totally covering the internal cervical os. As the lower segment thins and the cervix begins to efface, the inelastic placental attachment is disrupted, leading to the rupture of maternal intervillous vessels. This results in maternal hemorrhage without associated myometrial irritation, typically occurring during the third trimester when the lower uterine segment undergoes physiological elongation.
Rationale for correct answer
2. The presence of bright red, painless vaginal bleeding is the classic clinical manifestation of placenta previa. Because the bleeding originates from the detachment of the placenta from the lower uterine segment rather than a traumatic separation of the decidua, there is no myometrial tension or associated pain. This hallmark symptom typically occurs suddenly and may be episodic as the pregnancy progresses toward term.
Rationale for incorrect answers
1. Painful uterine contractions and a board-like rigidity of the abdomen are characteristic of abruptio placentae. These findings indicate that blood is infiltrating the myometrium or sequestering behind the placenta, causing significant tissue irritation. In placenta previa, the uterus remains soft and non-tender because the blood escapes through the cervix rather than being trapped within the muscular wall.
3. Increased fetal movement is not a diagnostic finding for placenta previa, and fetal tachycardia is often a non-specific response to maternal stress. While severe hemorrhage can eventually lead to fetal hypoxia and a non-reassuring heart rate, it is not a primary hallmark used to differentiate previa from other causes of late-gestational bleeding. Fetal status usually remains stable until maternal hypovolemia becomes significant.
4. Severe localized abdominal tenderness is a hallmark of placental abruption or uterine rupture, where the visceral peritoneum is irritated by internal bleeding. Placenta previa is characterized specifically by its lack of pain, as the placental separation occurs at the internal os where blood exits freely. Tenderness would suggest a different pathological process involving the upper uterine segment or an inflammatory abdominal condition.
Test-taking strategy
- Identify the Core Condition: Focus on the specific pathology of placenta previa versus its primary differential, abruptio placentae.
- Differentiate Pain Levels: Use the classic diagnostic rule that previa is painless while abruption is painful.
- Observe Bleeding Characteristics: Recognize that the color of blood in previa is typically bright red because it is fresh and exits the cervix immediately.
- Apply Anatomical Knowledge: Understand that because the placenta is over the cervical os, any bleeding is usually external and non-irritating to the uterine muscle.
- Rule out Rigidity: Eliminate any options describing uterine hardness or tenderness, as these are incompatible with the soft uterus seen in a previa assessment.
Take home points
- Painless, bright red vaginal bleeding in the second or third trimester is placenta previa until proven otherwise by ultrasound.
- A soft, relaxed, and non-tender uterus is the expected physical finding when assessing a client with a suspected placenta previa.
- Digital vaginal examinations are strictly contraindicated in these clients because they can trigger catastrophic and uncontrollable maternal hemorrhage.
- Management of stable placenta previa focuses on bed rest, pelvic rest, and scheduled cesarean delivery to avoid labor-related detachment.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Abruptio placentae with fetal distress represents a critical failure of uteroplacental perfusion due to premature decidual separation. This pathological state induces rapid fetal acidemia and hypoxia as the respiratory surface area of the placenta diminishes. Immediate surgical intervention is required to prevent irreversible neurological injury or intrauterine fetal demise when compensatory mechanisms like tachycardia or peripheral vasoconstriction fail to maintain fetal cerebral oxygenation.
Rationale for correct answer
3. Immediate cesarean section is the definitive treatment for fetal distress in the presence of placental abruption. Removing the fetus from a hypoxic environment stops the progression of acidemia caused by the loss of placental gas exchange. This rapid intervention is necessary to ensure neonatal survival and to allow for direct hemostatic control of maternal retroplacental hemorrhage.
Rationale for incorrect answers
1. Expectant management is only appropriate for preterm gestations where both the mother and fetus are hemodynamically stable. Weekly ultrasounds are insufficient when active distress is present, as the condition can progress to total detachment within minutes. Delaying delivery in a distressed fetus significantly increases the risk of stillbirth and maternal coagulopathy.
2. Tocolytics are generally contraindicated in the management of moderate to severe placental abruption. Attempting to delay delivery when the fetus is already showing signs of distress allows the hematoma to expand further. This pharmacological intervention masks the uterine hypertonicity that often accompanies abruption and delays the life-saving extraction of the compromised neonate.
4. Induction of labor with oxytocin is inappropriate when fetal distress is already established. Uterine contractions further compress the already compromised spiral arteries, exacerbating intervillous hypoxia and worsening the fetal condition. A high-dose drip increases the risk of uterine rupture and rapid maternal exsanguination during a severe placental separation event.
Test-taking strategy
- Identify the Physiological Crisis: The question identifies both abruptio placentae and fetal distress, signaling a Category 3 emergency.
- Prioritize Rapid Delivery: In obstetric emergencies where the fetus is unstable, the fastest and safest delivery method (cesarean section) is the priority.
- Apply Stability Principles: Rule out expectant management (choice 1) and tocolytics (choice 2) because they are only for stable patients without distress.
- Evaluate Uterine Stress: Eliminate oxytocin induction (choice 4) as it increases uterine pressure, which is dangerous for a fetus already lacking sufficient oxygen.
- Determine Definitive Care: Recognize that once the placental-fetal unit has failed, the only way to save the fetus is to bypass the placenta through surgery.
Take home points
- Fetal distress in the context of placental abruption mandates an immediate emergency cesarean section regardless of gestational age.
- Tocolytic therapy should be avoided in placental abruption as it can mask clinical symptoms and delay necessary surgical intervention.
- Conservative management is reserved only for Grade 1 abruptions where maternal and fetal vital signs remain within normal limits.
- Prompt delivery is also a maternal life-saving measure as it allows the uterus to contract down and achieve hemostasis at the detachment site.
Correct Answer is B
Explanation
Placental abruption is primarily driven by vascular endothelial dysfunction and acute vasospasm within the decidual spiral arteries. These pathological changes are significantly exacerbated by exogenous vasoconstrictors, which trigger decidual hemorrhage and mechanical separation of the placenta. Risk reduction focuses on eliminating modifiable triggers that compromise the integrity of the maternal-fetal interface and maintain stable systemic perfusion.
Rationale for correct answer
2. Avoiding tobacco and illicit drugs, specifically cocaine, is the most effective lifestyle modification for risk reduction. These substances induce profound arterial spasm and acute hypertension, leading to a rupture of the decidual vessels. Eliminating these chemical stressors preserves the vascular health of the maternal-fetal unit and prevents the sudden disruptions in blood flow that cause premature separation.
Rationale for incorrect answers
1. Increasing caffeine intake is not a recommended strategy and may actually be detrimental during pregnancy. High levels of caffeine can lead to maternal tachycardia and may contribute to vasoconstriction, which does not help in preventing abruption. Blood pressure should be managed through balanced nutrition and, if necessary, pharmacological interventions prescribed by a provider rather than stimulant dietary habits.
3. Restricting fluid intake to manage edema is an unsafe practice that leads to maternal dehydration. Adequate intravascular volume is required to maintain renal perfusion and ensure that the placenta receives sufficient blood flow. Edema is often a physiological result of increased plasma volume or venous stasis, and limiting water does not prevent the vascular rupture associated with abruption.
4. Resting in a supine position is contraindicated in late pregnancy because it causes aortocaval compression. The weight of the gravid uterus obstructs the inferior vena cava, decreasing venous return and cardiac output. This position reduces placental perfusion and can worsen fetal hypoxia, whereas a lateral tilt is the preferred position to maximize oxygen delivery.
Test-taking strategy
- Identify Modifiable Risks: Focus on the environmental and behavioral choices that have a documented causal link to placental separation.
- Recall Pathophysiology: Connect the role of vasoconstriction to the etiology of abruption. Choice 2 addresses the two most common chemical causes of placental vascular spasm.
- Evaluate Safety Logic: Rule out Choice 1 and Choice 3 because they describe nutritional restrictions or habits that are harmful to both the mother and the developing fetus.
- Assess Positioning Logic: Understand that the supine position (Choice 4) is physiologically detrimental in the third trimester due to pressure on major vessels.
- Prioritize Prevention: Apply the principle of health promotion, selecting the intervention that eliminates the most significant and preventable chemical triggers for the condition.
Take home points
- Smoking cessation is a primary intervention because nicotine increases the risk of decidual necrosis and subsequent placental separation.
- Cocaine use is a leading cause of catastrophic abruption due to the induction of severe, acute hypertensive crises and vasospasm.
- Maternal position should be optimized to the left lateral side to ensure maximum cardiac output and placental oxygenation.
- Chronic hypertension must be controlled throughout pregnancy to prevent the degenerative vascular changes that predispose the client to abruption.
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