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Ectopic Pregnancy | 마이메르시 MyMerci
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Ectopic Pregnancy

NCLEX Review Guide: Ectopic Pregnancy

Definition & Pathophysiology

Understanding Ectopic Pregnancy

  • An ectopic pregnancy occurs when a fertilized ovum implants outside the uterine cavity, most commonly (95%) in the fallopian tube. Other sites include the ovary, abdominal cavity, cervix, or cornual area of the uterus.
  • The implanted embryo cannot develop normally outside the uterus, and the growing tissue may cause life-threatening bleeding if left untreated.

Key Points

  • Most common site is the fallopian tube (particularly the ampulla)
  • Always considered a medical emergency due to risk of rupture and hemorrhage

Risk Factors

Common Risk Factors

  • Previous tubal surgery or ectopic pregnancy increases risk by 7-13 times compared to the general population.
  • Pelvic inflammatory disease (PID) can cause scarring of the fallopian tubes, increasing risk significantly.
  • Use of intrauterine devices (IUDs), history of infertility, assisted reproductive technology, and smoking are additional risk factors.
  • Endometriosis and previous pelvic or abdominal surgeries may also contribute to increased risk.

Key Points

  • Previous ectopic pregnancy is the strongest risk factor
  • PID and tubal damage are major contributing factors

Clinical Manifestations

Signs and Symptoms

  • The classic triad includes amenorrhea (missed period), vaginal bleeding, and unilateral lower abdominal pain.
  • Pain may be sharp, dull, or cramping in nature, often localized to one side of the pelvis.
  • If rupture occurs, patients may present with signs of hypovolemic shock: hypotension, tachycardia, diaphoresis, and shoulder pain (Kehr's sign) due to diaphragmatic irritation from intraperitoneal blood.

Clinical Scenario

A 28-year-old woman presents to the emergency department with sharp right lower quadrant pain that began suddenly 2 hours ago. She reports spotting for the past week despite being 7 weeks pregnant according to her last menstrual period. Vital signs show BP 90/60, HR 118, and she appears pale and diaphoretic. This presentation is highly suspicious for a ruptured ectopic pregnancy requiring immediate intervention.

Key Points

  • Symptoms typically appear between 6-8 weeks of gestation
  • Ruptured ectopic pregnancy presents as an acute abdomen with signs of shock

Diagnosis

Diagnostic Procedures

  • Transvaginal ultrasound is the primary imaging tool, showing an empty uterus with a gestational sac outside the uterine cavity in some cases.
  • Serial quantitative beta-hCG levels that do not rise appropriately (normally doubling every 48-72 hours in early pregnancy) suggest an abnormal pregnancy.
  • Culdocentesis (aspiration of blood from the posterior cul-de-sac) may be performed to detect intraperitoneal bleeding, though it is less commonly used now.

Key Points

  • Discriminatory zone: β-hCG level at which a gestational sac should be visible on ultrasound (1500-2000 mIU/mL)
  • Absence of intrauterine pregnancy with β-hCG above discriminatory zone strongly suggests ectopic pregnancy

Management

Treatment Options

  • Methotrexate: A folate antagonist that inhibits DNA synthesis and cell multiplication, used for medical management of unruptured ectopic pregnancies.
  • Surgical management includes laparoscopic or open salpingostomy (tube-sparing) or salpingectomy (removal of the affected tube).

Medical vs. Surgical Management

Medical (Methotrexate) Surgical
- Unruptured ectopic
- Stable patient
- β-hCG < 5000 mIU/mL
- Mass < 3.5 cm
- No fetal cardiac activity		 - Ruptured ectopic
- Hemodynamically unstable
- β-hCG > 5000 mIU/mL
- Larger mass
- Presence of cardiac activity

    Methotrexate Administration Protocol

  1. Confirm eligibility criteria (stable, unruptured ectopic with appropriate β-hCG levels)
  2. Obtain baseline labs including CBC, liver and renal function tests
  3. Administer single-dose methotrexate (50 mg/m² IM)
  4. Monitor β-hCG levels on days 4 and 7 post-injection
  5. Expect 15% decline in β-hCG between days 4 and 7
  6. If decline is insufficient, administer second dose
  7. Continue weekly β-hCG monitoring until levels are undetectable

Key Points

  • Ruptured ectopic pregnancy requires immediate surgical intervention
  • Methotrexate is contraindicated in patients with renal/hepatic disease, active infection, or immunodeficiency

Nursing Care

Assessment & Interventions

  • Closely monitor vital signs, focusing on signs of hypovolemic shock (hypotension, tachycardia, decreased urine output).
  • Assess pain level, location, and character; administer prescribed analgesics as needed.
  • Monitor for vaginal bleeding, noting amount, color, and presence of tissue.
  • Prepare for emergency surgery if rupture is suspected or occurs.

Memory Aid: Signs of Ruptured Ectopic

"SHOCK-EP"

  • Shoulder pain (referred from diaphragmatic irritation)
  • Hypotension
  • Oliguria
  • Cold, clammy skin
  • Kehr's sign (referred shoulder pain)
  • Extreme abdominal pain
  • Pallor

Key Points

  • Establish large-bore IV access (16-18 gauge) for potential rapid fluid resuscitation
  • Type and cross-match blood for potential transfusion

Patient Education

Discharge Instructions

  • After methotrexate therapy, advise patients to avoid folate-containing vitamins, NSAIDs, alcohol, and sun exposure for 7 days.
  • Instruct patients to avoid sexual intercourse until β-hCG levels are undetectable.
  • Educate about the importance of follow-up appointments for β-hCG monitoring.
  • Advise waiting 3-6 months before attempting to conceive again.

Important Alert

Instruct patients who received methotrexate to return immediately if experiencing severe abdominal pain, heavy vaginal bleeding, dizziness, or fainting, as these may indicate treatment failure or rupture.

Key Points

  • Provide emotional support for pregnancy loss
  • Discuss future fertility implications and increased risk for recurrent ectopic pregnancy

Commonly Confused Points

Differential Diagnosis

Ectopic Pregnancy vs. Similar Conditions

Condition Key Differentiating Features β-hCG Pattern
Ectopic Pregnancy Unilateral pain, irregular bleeding, empty uterus on ultrasound Abnormal rise (slower than expected)
Miscarriage Central cramping, heavier bleeding, tissue passage Declining levels
Corpus Luteum Cyst Ovarian cyst visible on ultrasound, pain with ovulation Normal pregnancy rise if pregnant
Appendicitis RLQ pain, anorexia, fever, no vaginal bleeding Not elevated (unless coincidental pregnancy)

Key Points

  • Ectopic pregnancy can be mistaken for normal early pregnancy complications
  • Always consider ectopic pregnancy in any woman of reproductive age with abdominal pain

Common Pitfalls

  • Assuming vaginal bleeding rules out ectopic pregnancy (light bleeding is actually common in ectopic)
  • Relying solely on a single β-hCG level rather than evaluating the pattern over time
  • Failing to consider ectopic pregnancy in patients with IUDs (actually increases relative risk)
  • Missing the diagnosis in patients with atypical presentations (e.g., no missed period)

Study Tips

NCLEX Preparation

  • Focus on recognizing the classic triad of symptoms: amenorrhea, vaginal bleeding, and unilateral pelvic pain.
  • Understand the risk factors, especially previous ectopic pregnancy and PID.
  • Know the criteria for medical versus surgical management.
  • Be familiar with nursing priorities: monitoring for shock, pain management, and emotional support.

Memory Aid: Risk Factors for Ectopic Pregnancy - "SAMPLEPIE"

  • Salpingitis (PID)
  • Abnormal tubes (congenital)
  • Multiple sexual partners
  • Previous ectopic pregnancy
  • Laparoscopic tubal surgery
  • Endometriosis
  • Previous pelvic surgery
  • IUD use
  • Exposure to DES in utero

Quick Check

Which of the following is NOT an appropriate candidate for methotrexate therapy?

  1. A woman with an unruptured ectopic pregnancy and β-hCG of 3000 mIU/mL
  2. A hemodynamically unstable woman with suspected ruptured ectopic pregnancy
  3. A woman with an ectopic pregnancy mass of 2 cm and no cardiac activity
  4. A woman with an ectopic pregnancy who wishes to preserve fertility

Answer: B - Hemodynamic instability indicates rupture requiring immediate surgical intervention

Key Points

  • NCLEX questions often focus on recognition of symptoms and appropriate nursing interventions
  • Prioritize assessment and interventions for life-threatening complications

Summary of Key Points

Critical Concepts

  • Ectopic pregnancy is the implantation of a fertilized ovum outside the uterine cavity, most commonly in the fallopian tube.
  • Risk factors include previous ectopic pregnancy, PID, tubal surgery, endometriosis, and IUD use.
  • Classic presentation includes the triad of amenorrhea, vaginal bleeding, and unilateral pelvic pain.
  • Diagnosis relies on transvaginal ultrasound and serial β-hCG measurements.
  • Treatment options include medical management with methotrexate or surgical intervention.
  • Ruptured ectopic pregnancy is a medical emergency requiring immediate surgical intervention.
  • Nursing care focuses on monitoring for signs of rupture, pain management, and emotional support.

Self-Assessment Checklist

  • I can explain the pathophysiology of ectopic pregnancy
  • I can identify major risk factors for ectopic pregnancy
  • I can recognize the classic signs and symptoms
  • I understand the diagnostic criteria and tests used
  • I can differentiate between candidates for medical vs. surgical management
  • I know the nursing priorities for patients with ectopic pregnancy
  • I can identify signs of ruptured ectopic pregnancy requiring emergency intervention

Remember that early recognition of ectopic pregnancy symptoms can save lives. As a nurse, your assessment skills are crucial in identifying this potentially life-threatening condition. Stay vigilant with any reproductive-age woman presenting with abdominal pain and vaginal bleeding!

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