Core Nursing Explanation
Key Concept Analysis: This question tests the
priority nursing intervention for a patient with
Placenta previa presenting with
painless bright red vaginal bleeding. Placenta previa occurs when the placenta implants over or near the internal cervical os. The primary danger is
hemorrhage from the disruption of placental vessels as the cervix begins to efface or dilate. The cardinal rule is to
Key Point! avoid any manipulation or examination of the cervix, as this can trigger massive, life-threatening bleeding.
Answer Rationale: The correct answer is
④ Place the client on complete bed rest in a side-lying position. This is the immediate, non-invasive action that minimizes the risk of exacerbating the bleeding. Bed rest reduces physical stress and uterine activity. The side-lying position (specifically left lateral) improves
uteroplacental perfusion by preventing supine hypotension from the gravid uterus compressing the inferior vena cava. This action directly supports the two primary goals:
stop the bleeding and
maximize fetal oxygenation. The patient's stable vital signs and reassuring fetal heart rate (FHR) pattern indicate this is a controlled initial bleed, allowing for conservative management.
Distractor Analysis:
Watch out for confusion! ① Perform a vaginal examination: This is
absolutely contraindicated in suspected placenta previa. A digital exam can puncture the placenta, causing catastrophic hemorrhage. A sterile speculum exam may be performed by a physician in a controlled setting, but a digital exam is never the nurse's action.
② Insert a large-bore IV catheter and obtain blood for type and crossmatch: While this is a
critical and urgent action for potential hemorrhage, it is not the
immediate priority when the patient is hemodynamically stable. The priority is to first prevent the situation from worsening. IV access and lab work would be done promptly, but
Key Point! the safest first action is to position and monitor without causing harm.
③ Position the client in Trendelenburg position to improve circulation: This position is
not recommended for antepartum hemorrhage. It does not stop uterine bleeding and can increase intracranial pressure and compromise respiratory status. The left lateral position is the standard of care for improving venous return and placental blood flow in pregnancy.
Related Concepts: This scenario highlights the critical difference between
placenta previa (painless, bright red bleeding) and
abruptio placentae (painful, dark red bleeding with a tense/tender uterus). Management differs significantly, with abruption sometimes requiring delivery even if the fetus is premature.
Concept Summary
| Concept | Key Points for Placenta Previa |
|---|
| Definition | Placenta implants over or near internal cervical os. |
| Classic Symptom | Painless, bright red vaginal bleeding in 2nd/3rd trimester. |
| Nursing Priority | Prevent further bleeding. NO vaginal exams. Monitor mother & fetus. |
| Positioning | Bed rest, left lateral side-lying to maximize placental perfusion. |
| Contraindicated Action | Digital cervical examination (can cause catastrophic hemorrhage). |
| Monitoring | Continuous FHR monitoring, maternal vital signs, pad count for bleeding. |
Side-by-Side Comparison!
| Feature | Placenta Previa | Abruptio Placentae |
|---|
| Bleeding | Painless, bright red, often recurrent | Painful, dark red, concealed or apparent |
| Uterus | Soft, non-tender | Firm, board-like, tender, may be hypertonic |
| Fetal Distress | May occur with significant blood loss | Common due to placental separation |
| Nursing Action (Initial) | Bed rest, left lateral position, NO vaginal exam | Assess for shock, IV access, prepare for emergency delivery |
Anatomy, Physiology & Pharmacology Points
The placenta is a vascular organ. In placenta previa, the lower uterine segment, which is thinner and less elastic, cannot adequately support the placenta as it stretches in the third trimester, leading to vessel separation and bleeding. The left lateral position displaces the uterus off the maternal great vessels (aorta and inferior vena cava), optimizing cardiac output and blood flow to the placenta. Medications like
corticosteroids (e.g., betamethasone) may be administered to accelerate fetal lung maturity if delivery is anticipated between 24-34 weeks.
Memory Tips
PREVIA = PAINLESS: Remember the "P" in both. For
Abruptio, think "
Agonizing pain" and "
Accident" (often associated with trauma or hypertension). The rule:
If you see "previa," keep your fingers out of there!
High-Frequency NCLEX Topics
Antepartum hemorrhage is a high-yield topic. The NCLEX loves to test: 1) Differentiating previa vs. abruption based on symptoms, 2) Identifying the contraindicated action (vaginal exam for previa), and 3) Determining priority interventions based on maternal/fetal stability (ABCs, then specific measures).
Watch Out for Question Variations!
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Symptom Identification: "A client at 32 weeks reports sudden, painless bright red bleeding. The nurse suspects..."
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Client Education: "Which instruction is most important for a client diagnosed with placenta previa?" (Answer: Report any bleeding immediately and avoid sexual intercourse.)
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Priority with Instability: If the question described hypotension, tachycardia, or fetal bradycardia, the priority would shift to
activating emergency response, administering oxygen, and establishing IV access for fluid/blood resuscitation.