ECTOPIC PREGNANCY- Comprehensive Notes for Medical Students
An ectopic pregnancy (EP) is a pregnancy in which implantation of the fertilized ovum occurs outside the normal endometrial cavity of the uterus.
Normally, fertilization occurs in the ampulla of the fallopian tube and the embryo travels into the uterine cavity for implantation. In ectopic pregnancy, this migration is disrupted.
It is a gynecological emergency because rupture can cause catastrophic intra-abdominal hemorrhage and maternal death.
2. EPIDEMIOLOGY
Worldwide Epidemiology
• Occurs in approximately 1–2% of all pregnancies
• Responsible for:
o 5–10% of pregnancy-related maternal deaths in first trimester
o Significant cause of maternal morbidity worldwide
• Incidence has increased due to:
o Increased pelvic inflammatory disease (PID)
o Assisted reproductive technology (ART)
o Better diagnostic techniques
o Delayed childbearing
Epidemiology in Kenya
• Ectopic pregnancy remains a major cause of:
o Acute abdomen in reproductive-age women
o First-trimester maternal mortality
o Emergency gynecological surgery
• Higher rates are linked to:
o PID secondary to sexually transmitted infections
o Unsafe abortions
o Delayed hospital presentation
o Limited access to early ultrasonography in rural areas
Kenya MOH guidelines classify ectopic pregnancy as an obstetric emergency requiring urgent diagnosis and intervention.
FULL VIDEO ON ECTOPIC PREGNANCY
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3. ANATOMICAL SITES / TYPES OF ECTOPIC PREGNANCY
A. Tubal Pregnancy (Most Common: >95%)
Sites:
1. Ampullary (70%)
2. Isthmic (12%)
3. Fimbrial (11%)
4. Interstitial/Cornual (2–4%)
B. Non-Tubal Pregnancy
1. Ovarian pregnancy
2. Cervical pregnancy
3. Cesarean scar pregnancy
4. Abdominal pregnancy
5. Heterotopic pregnancy
o Simultaneous intrauterine + ectopic pregnancy
o Common with IVF
4. CLASSIFICATION
According to Clinical State
A. Unruptured Ectopic Pregnancy
• Tube intact
• Mild symptoms
• Hemodynamically stable
B. Ruptured Ectopic Pregnancy
• Tubal rupture with hemorrhage
• Hemodynamic instability
• Surgical emergency
According to Viability
1. Living ectopic pregnancy
2. Non-viable ectopic pregnancy
5. ETIOLOGY AND RISK FACTORS
The major mechanism is:
“Delayed transport of fertilized ovum”
Major Risk Factors
A. Tubal Damage
1. Pelvic Inflammatory Disease (PID)
Especially:
• Chlamydia trachomatis
• Neisseria gonorrhoeae
PID damages tubal cilia causing impaired ovum transport.
2. Previous Ectopic Pregnancy
Recurrence risk:
• Approximately 10%
• Up to 25% after two ectopics
3. Tubal Surgery
Examples:
• Tubal ligation
• Tuboplasty
• Reanastomosis
B. Reproductive Technologies
• IVF
• Ovulation induction
C. Contraceptive Factors
• Pregnancy occurring with IUCD in situ
• Progesterone-only pills
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D. Lifestyle Factors
Smoking
Nicotine impairs ciliary motility.
E. Other Factors
• Endometriosis
• Congenital tubal anomalies
• Multiple sexual partners
• Previous abortions
• Advanced maternal age (>35 years)
6. PATHOPHYSIOLOGY
Normal Physiology
Fertilization occurs in the ampulla and embryo travels to uterus within 3–4 days.
In Ectopic Pregnancy
Tubal pathology causes:
• Delayed embryo transport
• Premature implantation in tube
The trophoblast invades the tubal wall.
Unlike the uterus:
• Fallopian tube lacks adequate decidual layer
• Cannot accommodate growing gestation
This leads to:
1. Tubal distension
2. Hemorrhage
3. Tubal rupture
4. Massive hemoperitoneum
Tubal Outcomes
1. Tubal abortion
2. Tubal rupture
3. Secondary abdominal implantation
4. Resolution/resorption
7. CLINICAL FEATURES
Classic Triad
1. Amenorrhea
2. Lower abdominal pain
3. Vaginal bleeding
Present in only about 50%.
Symptoms
• Dizziness
• Syncope
• Shoulder tip pain
• Rectal pressure
• Weakness
Signs
Stable Patient
• Mild abdominal tenderness
• Cervical motion tenderness
• Adnexal tenderness/mass
Ruptured Ectopic
• Pallor
• Hypotension
• Tachycardia
• Abdominal guarding
• Rebound tenderness
• Shock
8. DIAGNOSIS
A. Pregnancy Test
β-hCG
Positive in most cases.
B. Transvaginal Ultrasound (TVUS)
Gold standard imaging.
Findings:
• Empty uterus
• Adnexal mass
• Tubal ring
• Free pelvic fluid
• Fetal cardiac activity outside uterus
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β-hCG Discriminatory Zone
Usually:
1500–2000 IU/L
If β-hCG exceeds this level and no intrauterine pregnancy is seen → suspect ectopic pregnancy.
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C. Serial β-hCG Measurements
Normal pregnancy:
• β-hCG doubles every 48 hours
Ectopic:
• Inadequate rise or plateau
D. Culdocentesis
Rarely used now.
Detects intraperitoneal blood.
E. Laparoscopy
Definitive diagnosis and treatment.
Differential Diagnosis
1. Miscarriage
2. PID
3. Ovarian torsion
4. Appendicitis
5. Ruptured ovarian cyst
6. UTI
9. MANAGEMENT
INITIAL MANAGEMENT (ABC)
Resuscitation
• Airway
• Breathing
• Circulation
Immediate Measures
• IV access (2 wide-bore cannulas)
• Blood grouping and crossmatch
• IV fluids
• Oxygen
• CBC
• Arrange surgery if unstable
MANAGEMENT OPTIONS
A. EXPECTANT MANAGEMENT
Suitable when:
• Stable patient
• Minimal symptoms
• Small ectopic
• Falling β-hCG
• No fetal cardiac activity
Requires:
• Serial β-hCG monitoring
• Repeat ultrasound
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B. MEDICAL MANAGEMENT
Drug Used:
Methotrexate
Mechanism:
Folate antagonist
Inhibits rapidly dividing trophoblastic tissue.
Indications
• Hemodynamically stable
• Unruptured ectopic
• No contraindications
• Mass <3.5–4 cm
• β-hCG usually <5000 IU/L
• No fetal cardiac activity
Contraindications
Absolute
• Hemodynamic instability
• Rupture
• Liver disease
• Renal disease
• Blood dyscrasias
• Breastfeeding
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Single-Dose Regimen
Most common
Methotrexate:
50\ \mathrm{mg/m^2}\ IM
β-hCG checked on:
• Day 4
• Day 7
Expected:
≥15% decline.
Side Effects
• Stomatitis
• Nausea
• Hepatotoxicity
• Bone marrow suppression
Follow-Up Advice
Avoid:
• Pregnancy for 3 months
• Alcohol
• Folic acid
• NSAIDs
C. SURGICAL MANAGEMENT
Indications
• Ruptured ectopic
• Hemodynamic instability
• Failed methotrexate
• Contraindications to methotrexate
• Large ectopic mass
• Fetal cardiac activity
Surgical Options
1. Salpingectomy
Removal of affected tube.
Preferred when:
• Severe damage
• Completed family
• Ruptured tube
2. Salpingostomy
Incision made and ectopic removed while preserving tube.
Used when:
• Fertility desired
• Opposite tube damaged
Risk:
• Persistent trophoblastic tissue
Surgical Approaches
1. Laparoscopy (preferred)
2. Laparotomy (shock/rupture)
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10. COMPLICATIONS
Acute Complications
• Hemorrhagic shock
• Death
• Tubal rupture
• Disseminated intravascular coagulation
Long-Term Complications
• Infertility
• Recurrent ectopic pregnancy
• Psychological trauma
• Chronic pelvic pain
11. PREVENTION
Primary Prevention
1. STI prevention
2. Early PID treatment
3. Safe sexual practices
4. Smoking cessation
5. Safe abortion services
Secondary Prevention
1. Early pregnancy scanning
2. Early antenatal booking
3. Prompt evaluation of:
o Pain
o Bleeding
o Amenorrhea
12. PROGNOSIS
Depends on:
• Early diagnosis
• Degree of hemorrhage
• Tubal damage
Future fertility:
• Good if contralateral tube normal
• Recurrence risk remains elevated
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13. KEY EXAM POINTS FOR MEDICAL STUDENTS
Commonest Site
Ampulla of fallopian tube
Most Important Investigation
Transvaginal ultrasound
Most Important Emergency Complication
Hemorrhagic shock
Drug Used in Medical Management
Methotrexate
Classic Triad
1. Amenorrhea
2. Abdominal pain
3. Vaginal bleeding
14. KENYA MOH APPROACH SUMMARY
Kenya MOH recommends:
• Rapid diagnosis
• Early ultrasound
• Aggressive resuscitation
• Emergency surgery for rupture
• Blood transfusion when indicated
• Referral from lower facilities promptly
15. IMPORTANT MCQ PEARLS
Question Answer
Commonest site- Ampulla
Best diagnostic tool- TVUS
Most common symptom- Abdominal pain
Drug for stable ectopic- Methotrexate
Major cause in Africa- PID
Dangerous complication- Rupture and hemorrhage
16. RECOMMENDED TEXTBOOK REFERENCES
Standard Obstetrics Books
1. Williams Obstetrics
2. Ten Teachers Obstetrics
3. DC Dutta’s Textbook of Obstetrics
4. Novak’s Gynecology
5. Current Obstetric and Gynecologic Diagnosis and Treatment
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| DRPAMLI |
1. Kenya National Guidelines for Quality Obstetrics and Perinatal Care (WHO Extranet)
2. NICE Guideline on Ectopic Pregnancy (NCBI)
3. StatPearls Ectopic Pregnancy Review (NCBI)
4. BMJ Review on Diagnosis and Management (srh.bmj.com)
5. WHO-aligned emergency obstetric guidance (Sage Journals)
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