MBBS Year
1st Year
Subject
What Is Usually Asked
Parts of the fallopian tube, pouch of Douglas
ReferenceAll Years (1st-Final)All UniversitiesEctopic Pregnancy
Ectopic Pregnancy: Notes, PPT and PYQs for MBBS
Ectopic pregnancy is implantation of a fertilised ovum outside the endometrial lining of the uterine cavity, most often in the fallopian tube. A ruptured ectopic pregnancy is a surgical emergency and an important cause of maternal death in early pregnancy. It is a high-yield topic in Final Year Obstetrics and Gynaecology, with links to Anatomy, Pathology and Pharmacology.
SME-reviewed. Updated 2026.
Open in GeckoMed for PPT slides and notes.Quick Summary: What You Need to Know for University Exams
- The fallopian tube is the most common site; within the tube, the ampulla is the most common location.
- Isthmic ectopic pregnancies tend to rupture early, while interstitial (cornual) ectopics rupture later with heavy bleeding.
- Key risk factors: previous ectopic pregnancy, pelvic inflammatory disease, tubal surgery and assisted reproduction.
- Classic presentation: amenorrhoea, lower abdominal pain and vaginal bleeding.
- Diagnosis rests on serum hCG and transvaginal ultrasound; laparoscopy is the gold standard.
- Management may be expectant, medical (methotrexate) or surgical (salpingectomy or salpingostomy).
- Anti-D immunoglobulin is given to Rh-negative women.
Ectopic Pregnancy Across MBBS Subjects
| MBBS Year | Subject | What Is Usually Asked |
|---|---|---|
| 1st Year | Anatomy | Parts of the fallopian tube, pouch of Douglas |
| 1st Year | Physiology | Fertilisation, implantation, hCG |
| 2nd Year | Pathology | Arias-Stella reaction, decidual changes |
| 2nd Year | Pharmacology | Methotrexate |
| Final Year | Obstetrics and Gynaecology | Risk factors, clinical features, diagnosis, management |
| Final Year | General Surgery | Differential diagnosis of acute abdomen |
MBBS Year
1st Year
Subject
What Is Usually Asked
Fertilisation, implantation, hCG
MBBS Year
2nd Year
Subject
What Is Usually Asked
Arias-Stella reaction, decidual changes
MBBS Year
2nd Year
Subject
What Is Usually Asked
Methotrexate
MBBS Year
Final Year
Subject
What Is Usually Asked
Risk factors, clinical features, diagnosis, management
MBBS Year
Final Year
Subject
What Is Usually Asked
Differential diagnosis of acute abdomen
Definition and Classification
Definition: Ectopic pregnancy is a pregnancy in which the blastocyst implants anywhere other than the endometrial lining of the uterine cavity.
Sites of Ectopic Pregnancy
| Site | Key Points |
|---|---|
| Tubal (by far the most common) | Ampulla (most common), isthmus, fimbria, interstitial (cornual) |
| Ovarian | Rare |
| Cervical | Rare; risk of severe haemorrhage |
| Abdominal | Rare; may progress to advanced gestation |
| Caesarean scar | Increasing with rising caesarean rates |
| Heterotopic | Intrauterine and ectopic pregnancy together; more likely with assisted reproduction |
Site
Tubal (by far the most common)
Key Points
Ampulla (most common), isthmus, fimbria, interstitial (cornual)
Site
Ovarian
Key Points
Rare
Site
Cervical
Key Points
Rare; risk of severe haemorrhage
Site
Abdominal
Key Points
Rare; may progress to advanced gestation
Site
Caesarean scar
Key Points
Increasing with rising caesarean rates
Site
Heterotopic
Key Points
Intrauterine and ectopic pregnancy together; more likely with assisted reproduction
Tubal Sites Compared
| Site | Usual Outcome |
|---|---|
| Ampulla | Often tubal abortion or later rupture |
| Isthmus | Early rupture because the lumen is narrow |
| Interstitial | Later rupture with severe haemorrhage because of the thick myometrium and rich blood supply |
Site
Ampulla
Usual Outcome
Often tubal abortion or later rupture
Site
Isthmus
Usual Outcome
Early rupture because the lumen is narrow
Site
Interstitial
Usual Outcome
Later rupture with severe haemorrhage because of the thick myometrium and rich blood supply
Aetiology (Risk Factors)
| Category | Examples |
|---|---|
| Tubal damage | Previous pelvic inflammatory disease (especially Chlamydia), previous tubal surgery or sterilisation, previous ectopic pregnancy |
| Assisted reproduction | In vitro fertilisation and ovulation induction |
| Contraception failure | Pregnancy occurring with an intrauterine device in place or after sterilisation is more likely to be ectopic |
| Other | Smoking, endometriosis, increasing maternal age, salpingitis isthmica nodosa |
Category
Tubal damage
Examples
Previous pelvic inflammatory disease (especially Chlamydia), previous tubal surgery or sterilisation, previous ectopic pregnancy
Category
Assisted reproduction
Examples
In vitro fertilisation and ovulation induction
Category
Contraception failure
Examples
Pregnancy occurring with an intrauterine device in place or after sterilisation is more likely to be ectopic
Category
Other
Examples
Smoking, endometriosis, increasing maternal age, salpingitis isthmica nodosa
Pathophysiology
Flowchart
- Tubal damage or dysfunction delays transport of the fertilised ovum
- The blastocyst implants in the tubal wall instead of the uterine cavity
- The tube cannot form a proper decidua or expand to support the pregnancy
- Trophoblast invades the tubal wall and its blood vessels
- Possible outcomes: tubal abortion through the fimbrial end, rupture of the tube with haemoperitoneum, or spontaneous resolution
Uterine changes: The endometrium still responds to pregnancy hormones and becomes decidualised. The Arias-Stella reaction (hypersecretory glandular change) may be seen, and the decidua may be shed as a decidual cast.
(Examiner may ask you to draw the parts of the fallopian tube and the sites of ectopic implantation.)
Clinical Features
Unruptured (Subacute) Ectopic Pregnancy
- Short period of amenorrhoea
- Lower abdominal pain, often one-sided
- Slight vaginal bleeding or spotting
- Adnexal tenderness and sometimes a tender mass
- Pain on moving the cervix (cervical motion tenderness)
Ruptured Ectopic Pregnancy
- Sudden severe lower abdominal pain
- Fainting, dizziness and signs of shock (pallor, tachycardia, hypotension)
- Shoulder tip pain from blood irritating the diaphragm
- Abdominal distension, tenderness and guarding
- Marked cervical motion tenderness and fullness in the pouch of Douglas
Classic triad: amenorrhoea, abdominal pain and vaginal bleeding. Not all patients have all three, so any woman of reproductive age with abdominal pain should be tested for pregnancy.
Differential Diagnosis
| Condition | Distinguishing Points |
|---|---|
| Miscarriage | Intrauterine sac on ultrasound; bleeding usually heavier than pain |
| Ruptured or haemorrhagic ovarian cyst | Pregnancy test usually negative |
| Ovarian torsion | Sudden pain with an adnexal mass; negative pregnancy test |
| Acute appendicitis | Migratory pain to the right iliac fossa, fever; negative pregnancy test |
| Pelvic inflammatory disease | Fever, vaginal discharge, bilateral tenderness |
Condition
Miscarriage
Distinguishing Points
Intrauterine sac on ultrasound; bleeding usually heavier than pain
Condition
Ruptured or haemorrhagic ovarian cyst
Distinguishing Points
Pregnancy test usually negative
Condition
Ovarian torsion
Distinguishing Points
Sudden pain with an adnexal mass; negative pregnancy test
Condition
Acute appendicitis
Distinguishing Points
Migratory pain to the right iliac fossa, fever; negative pregnancy test
Condition
Pelvic inflammatory disease
Distinguishing Points
Fever, vaginal discharge, bilateral tenderness
Diagnosis
| Investigation | Key Points |
|---|---|
| Urine pregnancy test | First step in any woman of reproductive age with abdominal pain or bleeding |
| Serum beta-hCG | Quantitative level; serial values help. In a normal early intrauterine pregnancy, hCG rises steadily; a suboptimal rise or plateau suggests an abnormal pregnancy |
| Transvaginal ultrasound | Empty uterus with an adnexal mass or gestational sac outside the uterus; free fluid in the pouch of Douglas; a "ring of fire" on colour Doppler; a pseudogestational sac may be seen in the uterus |
| Discriminatory zone | The hCG level above which an intrauterine sac should be visible on transvaginal ultrasound (commonly cited between about 1,500 and 3,500 mIU/mL) |
| Laparoscopy | Gold standard for diagnosis, and allows treatment at the same time |
| Blood group and Rh typing | Needed for anti-D and possible transfusion |
| Complete blood count | Assesses blood loss |
Investigation
Urine pregnancy test
Key Points
First step in any woman of reproductive age with abdominal pain or bleeding
Investigation
Serum beta-hCG
Key Points
Quantitative level; serial values help. In a normal early intrauterine pregnancy, hCG rises steadily; a suboptimal rise or plateau suggests an abnormal pregnancy
Investigation
Transvaginal ultrasound
Key Points
Empty uterus with an adnexal mass or gestational sac outside the uterus; free fluid in the pouch of Douglas; a "ring of fire" on colour Doppler; a pseudogestational sac may be seen in the uterus
Investigation
Discriminatory zone
Key Points
The hCG level above which an intrauterine sac should be visible on transvaginal ultrasound (commonly cited between about 1,500 and 3,500 mIU/mL)
Investigation
Laparoscopy
Key Points
Gold standard for diagnosis, and allows treatment at the same time
Investigation
Blood group and Rh typing
Key Points
Needed for anti-D and possible transfusion
Investigation
Complete blood count
Key Points
Assesses blood loss
Management
Immediate Management of Ruptured Ectopic Pregnancy
- Resuscitate: large-bore intravenous access, fluids, blood grouping and cross-matching
- Urgent surgery: laparotomy if haemodynamically unstable, or laparoscopy if expertise and stability allow
- Salpingectomy is usually performed
Options for Unruptured Ectopic Pregnancy
| Option | Suitable When | Key Points |
|---|---|---|
| Expectant management | Stable patient with low and falling hCG, minimal symptoms | Close follow-up with serial hCG until negative |
| Medical (methotrexate) | Stable, unruptured, no fetal cardiac activity, hCG and mass size within accepted limits, reliable follow-up | Folic acid antagonist that stops trophoblast growth; monitor hCG until negative; avoid folic acid, alcohol and NSAIDs during treatment |
| Surgical: salpingectomy | Damaged tube, rupture, healthy contralateral tube | Removes the tube with the pregnancy |
| Surgical: salpingostomy | Desire for fertility with a damaged contralateral tube | Removes the pregnancy and preserves the tube; follow-up hCG is needed for persistent trophoblast |
Option
Expectant management
Suitable When
Stable patient with low and falling hCG, minimal symptoms
Key Points
Close follow-up with serial hCG until negative
Option
Medical (methotrexate)
Suitable When
Stable, unruptured, no fetal cardiac activity, hCG and mass size within accepted limits, reliable follow-up
Key Points
Folic acid antagonist that stops trophoblast growth; monitor hCG until negative; avoid folic acid, alcohol and NSAIDs during treatment
Option
Surgical: salpingectomy
Suitable When
Damaged tube, rupture, healthy contralateral tube
Key Points
Removes the tube with the pregnancy
Option
Surgical: salpingostomy
Suitable When
Desire for fertility with a damaged contralateral tube
Key Points
Removes the pregnancy and preserves the tube; follow-up hCG is needed for persistent trophoblast
Contraindications to methotrexate (examples): haemodynamic instability, rupture, breastfeeding, significant liver, kidney or blood disorders, and inability to attend follow-up.
Rh-negative women: Give anti-D immunoglobulin as per guidelines.
Complications
- Haemorrhagic shock and death
- Loss of the fallopian tube
- Recurrent ectopic pregnancy
- Subfertility
- Persistent trophoblastic tissue after conservative surgery
- Side effects of methotrexate
Prevention
- Early diagnosis and treatment of pelvic inflammatory disease
- Safe sexual practices and screening for Chlamydia
- Early ultrasound in women with previous ectopic pregnancy or tubal surgery
- Counselling women with risk factors to seek early care when pregnant
Prognosis
With early diagnosis and treatment, most women recover well. The chance of a future intrauterine pregnancy depends on the state of the remaining tube and on the underlying cause, and the risk of recurrence is higher than in the general population.
Quick Viva Questions
Q: What is the most common site of ectopic pregnancy? A: The ampulla of the fallopian tube.
Q: Which tubal ectopic ruptures earliest? A: Isthmic ectopic, because the lumen is narrow.
Q: What is the Arias-Stella reaction? A: Hypersecretory changes in the endometrial glands under the influence of pregnancy hormones, which may be seen in ectopic pregnancy.
Q: What is the gold-standard investigation for ectopic pregnancy? A: Laparoscopy.
Q: Why is shoulder tip pain seen in ruptured ectopic pregnancy? A: Blood in the peritoneal cavity irritates the diaphragm, and pain is referred along the phrenic nerve (C3 to C5) to the shoulder.
How Ectopic Pregnancy Appears in MBBS University Exams
Typical question styles (not attributed to specific papers or years):
- "Define ectopic pregnancy. Discuss the aetiology, clinical features, diagnosis and management of tubal ectopic pregnancy." (Long essay, Obstetrics)
- "Discuss the management of ruptured ectopic pregnancy." (Long essay)
- "Write a short note on medical management of ectopic pregnancy." (Short note)
- "Write a short note on the differential diagnosis of acute abdomen in early pregnancy." (Short note)
- "Write a short note on the Arias-Stella reaction." (Short note, Pathology)
Frequently Asked Questions
What is the classic presentation of ectopic pregnancy?
Amenorrhoea, lower abdominal pain and vaginal bleeding. A ruptured ectopic pregnancy may present with shock and shoulder tip pain.
When is methotrexate used for ectopic pregnancy?
In selected stable women with an unruptured ectopic pregnancy, no fetal heart activity, hCG and mass size within accepted limits, and the ability to attend follow-up.
Can I download the ectopic pregnancy PPT for my presentation?
Yes. Use the Download PPT button at the top of this page. The GeckoMed app also gives offline access to the slides and notes.
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