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

https://youtu.be/O1Yt5nUsrl0

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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

________________________________________

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

________________________________________

β-hCG Discriminatory Zone

Usually:

1500–2000 IU/L

If β-hCG exceeds this level and no intrauterine pregnancy is seen → suspect ectopic pregnancy.

________________________________________

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

________________________________________

DRPAMLI
17. GUIDELINE REFERENCES

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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