Core Nursing Explanation
This question tests the priority nursing action for a stable patient diagnosed with
complete placenta previa. The core principle is
avoiding any intervention that could disrupt the placenta and cause massive, life-threatening hemorrhage.
Key Concept Analysis
Placenta previa occurs when the placenta implants over or near the internal cervical os. In
complete placenta previa, the placenta completely covers the os. The hallmark symptom is
painless, bright red vaginal bleeding in the third trimester, as the lower uterine segment thins and the cervix begins to efface/dilate, causing placental separation. The primary danger is
Key Point! exsanguinating hemorrhage for the mother and
compromised fetal oxygenation.
Answer Rationale
The patient is currently
stable (normal vital signs, reassuring fetal heart rate). The immediate goal is
conservative management to prolong the pregnancy for fetal lung maturity, while preventing any action that could worsen bleeding. Therefore, the priority is
Key Point! Maintain strict bed rest and monitor maternal and fetal status. This includes:
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Bed rest: Minimizes pressure on the placenta and reduces the risk of further separation.
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Continuous monitoring: Frequent assessment of maternal vital signs (for signs of hypovolemia), vaginal bleeding (pad count), and continuous electronic fetal monitoring (for signs of fetal distress like late decelerations or bradycardia) are essential.
Distractor Analysis
Watch out for confusion! The incorrect options are dangerous interventions for placenta previa.
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① Perform a sterile vaginal examination: This is
absolutely contraindicated in suspected or confirmed placenta previa. Digital examination of the cervix can directly traumatize the placenta, leading to immediate, severe hemorrhage.
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② Administer IV oxytocin: Oxytocin is a uterotonic used to
induce labor or treat postpartum hemorrhage from
uterine atony. In placenta previa, the bleeding source is the placenta itself, not a boggy uterus. Administering oxytocin could induce contractions, which would further shear the placenta and worsen bleeding.
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③ Encourage ambulation: Activity and increased abdominal pressure can aggravate bleeding. The patient should be on
bed rest, often in a lateral position to optimize placental perfusion.
Related Concepts
Management depends on maternal/fetal stability and gestational age. For an unstable mother or fetus, immediate
cesarean section is the definitive treatment. Conservative management (as in this scenario) includes bed rest, possible
corticosteroid administration to accelerate fetal lung maturity, and preparation for a scheduled c-section once the fetus is mature.
Concept Summary
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Placenta Previa: Painless, bright red bleeding in 3rd trimester. Placenta covers cervical os.
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Priority Nursing Action (Stable Patient): Strict bed rest, continuous monitoring (maternal VS, bleeding, fetal heart rate).
NO vaginal exams.
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Definitive Treatment: Cesarean section.
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Key Differentiator from Abruptio Placentae: Previa = painless bleeding; Abruptio = painful, dark bleeding with a tense/tender uterus.
Side-by-Side Comparison!
| Feature | Placenta Previa | Abruptio Placentae |
|---|
| Bleeding | Painless, bright red, often recurrent | Painful, dark (concealed or apparent), sudden onset |
| Uterus | Soft, non-tender | Firm, board-like, tender, hypertonic |
| Fetal Heart Rate | Often normal initially | Signs of distress (bradycardia, late decels) common |
| Risk Factors | Previous c-section, multiparity, advanced maternal age | Hypertension, trauma, cocaine use, smoking |
| Nursing Priority (Stable) | Bed rest, monitor, avoid vaginal exams | Lateral position, monitor for concealed hemorrhage & DIC, prepare for emergency delivery |
Anatomy, Physiology & Pharmacology Points
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Anatomy: The
lower uterine segment is poorly contractile. If the placenta is attached here, it cannot constrict bleeding vessels effectively after separation, leading to hemorrhage.
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Physiology: Bleeding is from maternal vessels. The fetus can become hypoxic if a significant portion of the placenta detaches.
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Pharmacology:
Betamethasone or
Dexamethasone may be given to promote fetal lung maturity (surfactant production) if delivery is anticipated between 24-34 weeks.
Memory Tips
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Previa = Painless & Placenta Precedes (comes before the baby over the cervix).
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Abruptio = Agonizing & Abdominal rigidity.
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Rule of "NO VE": In any painless 3rd trimester bleeding, assume placenta previa until proven otherwise and perform
NO Vaginal Examination.
High-Frequency NCLEX Topics
NCLEX loves to test the
critical contraindication of vaginal exams in placenta previa. You will also see questions on differentiating previa from abruptio based on presentation, and prioritizing actions in an obstetric hemorrhage scenario (remember
ABCs and preparing for emergency delivery).
Watch Out for Question Variations!
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If the patient becomes unstable (BP drops
90/60, HR rises
>120, fetal bradycardia): The priority shifts to
Key Point! Initiating emergency protocols, starting large-bore IV lines, administering oxygen, and preparing for immediate cesarean section.
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If asked about patient education: Teach to report any bleeding immediately, avoid sexual intercourse, and adhere to bed rest.
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If asked about diagnostic confirmation:
Transabdominal or transvaginal ultrasound is the gold standard for diagnosis.