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Placental Abnormalities | 마이메르시 MyMerci
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Placental Abnormalities

NCLEX Review Guide: Placental Abnormalities

Placental Abnormalities Overview

Major Placental Disorders

  • Placenta previa occurs when the placenta implants in the lower uterine segment, partially or completely covering the cervical os, leading to painless bright red bleeding typically in the third trimester.
  • Abruptio placentae is the premature separation of a normally implanted placenta from the uterine wall, causing severe abdominal pain, rigid uterus, and dark red bleeding with potential for maternal shock.
  • Placenta accreta spectrum involves abnormal placental attachment where placental villi invade the myometrium, creating risk for severe hemorrhage during delivery.

Placenta Previa vs. Abruptio Placentae

FeaturePlacenta PreviaAbruptio Placentae
BleedingPainless, bright redPainful, dark red
Uterine toneSoft, relaxedRigid, board-like
Fetal heart rateUsually normalOften non-reassuring
OnsetGradual, recurrentSudden, severe

Key Points

  • Never perform vaginal exams with suspected placenta previa due to risk of catastrophic hemorrhage
  • Abruptio placentae requires immediate delivery and close monitoring for DIC development
  • Both conditions require type and crossmatch for potential blood transfusion

Clinical Management

Nursing Interventions

  1. Assess vital signs frequently, monitoring for signs of hemorrhagic shock including hypotension, tachycardia, and decreased urine output
  2. Position client in left lateral position to promote uteroplacental perfusion and prevent supine hypotension syndrome
  3. Establish large-bore IV access (18-gauge or larger) for rapid fluid resuscitation and potential blood product administration
  4. Monitor fetal heart rate continuously using electronic fetal monitoring to assess fetal well-being and detect signs of distress
  5. Prepare for emergency cesarean delivery, ensuring operating room availability and anesthesia team notification

Clinical Scenario

A 32-week pregnant client presents with sudden onset of severe abdominal pain and vaginal bleeding. Uterus feels rigid on palpation, and fetal heart rate shows late decelerations. This presentation suggests abruptio placentae requiring immediate intervention and likely emergency delivery.

Memory Aid

"PREVIA = PAINLESS" - Placenta previa presents with painless bleeding

"ABRUPTION = AGONY" - Abruptio placentae causes severe abdominal pain

Risk Factors and Prevention

High-Risk Factors

  • Maternal age over 35, multiparity, and history of previous placental abnormalities increase risk for both placenta previa and abruptio placentae.
  • Substance abuse (especially cocaine and smoking) significantly increases risk of abruptio placentae due to vasoconstriction effects.
  • Hypertensive disorders including preeclampsia and chronic hypertension are major risk factors for placental abruption.
  • Previous cesarean delivery or uterine surgery increases risk for placenta accreta spectrum disorders.

Key Points

  • Trauma (motor vehicle accidents, domestic violence) can precipitate abruptio placentae
  • Multiple gestations and polyhydramnios increase uterine overdistension risk
  • Short umbilical cord or rapid uterine decompression can cause abruption

Commonly Confused Points

Critical Distinctions

Bleeding Characteristics

ConditionBlood ColorPain LevelUterine Consistency
Placenta PreviaBright redPainlessSoft, non-tender
Abruptio PlacentaeDark red/clotsSevere painRigid, board-like
Normal bloody showPink-tinged mucusMild crampingContracting normally

Quick Memory Tricks

Placenta Previa: "P" for Painless, Pink/bright red blood, Position covers cervix

Abruptio Placentae: "A" for Agonizing pain, Abdomen rigid, Away from uterine wall

Common Pitfalls

  • Don't confuse bloody show (normal) with pathological bleeding - bloody show is minimal pink-tinged mucus
  • Remember that concealed hemorrhage in abruptio placentae may not show external bleeding but still causes shock
  • Never perform vaginal exam until placenta previa is ruled out via ultrasound

Study Tips and Self-Assessment

NCLEX Success Strategies

Study Mnemonics

PLACENTA PREVIA:

  • Painless bleeding
  • Low implantation
  • Assess with ultrasound
  • Cesarean delivery often needed
  • Emergency preparation

Quick Check Questions

Can you differentiate between painful vs. painless bleeding?
Do you know when vaginal exams are contraindicated?
Can you identify priority nursing interventions for hemorrhage?
Do you understand fetal monitoring changes with each condition?

Priority Nursing Actions

  • ABC assessment first - Airway, Breathing, Circulation with focus on maternal hemodynamic stability
  • Continuous fetal monitoring to detect compromise early and guide delivery timing decisions
  • Prepare for emergency delivery while providing emotional support to reduce maternal anxiety

You've got this! Remember that understanding placental abnormalities is crucial for maternal-newborn safety. Focus on the key differences between conditions, prioritize patient safety, and trust your nursing judgment. Every question you master brings you closer to becoming an excellent nurse!

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