AIM STEP 10
4th Year MBBS • Endocrine + Reproduction
Student Memory Support
Topic 18 — Early Pregnancy Disorders: Miscarriage, Ectopic Pregnancy and Gestational Trophoblastic Disease
High-yield memory reinforcement for rapid clinical and examination revision.
Prepared according to the supplied AIM Student Memory Support structure. :contentReference[oaicite:0]{index=0}
1. High-Yield Flashcards
Tap each question to reveal the answer.
What is miscarriage?
Spontaneous loss of pregnancy before the fetus has reached viability.
Which miscarriage has bleeding with a viable pregnancy and a closed cervix?
Threatened miscarriage.
Which miscarriage has retained nonviable pregnancy tissue with a closed cervix?
Missed miscarriage.
What is an important cause of isolated early spontaneous pregnancy loss?
Chromosomal abnormality of the conceptus.
What are the three broad management approaches for miscarriage?
Expectant, medical and surgical management.
What findings suggest septic miscarriage?
Fever, uterine tenderness and offensive vaginal discharge.
What is an ectopic pregnancy?
Implantation of a fertilized ovum outside the normal endometrial cavity.
What is the commonest tubal site of ectopic implantation?
The ampullary part of the fallopian tube.
Which two investigations are central when ectopic pregnancy location is uncertain?
Transvaginal ultrasound and serial serum β-hCG.
What does shoulder-tip pain suggest in a patient with suspected ectopic pregnancy?
Diaphragmatic irritation by intraperitoneal blood.
How is gestational trophoblastic disease broadly classified?
Hydatidiform mole and gestational trophoblastic neoplasia.
What distinguishes a complete mole from a partial mole regarding fetal tissue?
A complete mole has no embryo or fetus; fetal tissue may be present in a partial mole.
Why can a molar pregnancy produce hyperthyroid manifestations?
Very high hCG can stimulate thyroid receptors.
What follow-up test is essential after evacuation of a hydatidiform mole?
Serial quantitative serum hCG measurement.
What is the characteristic trophoblastic composition of choriocarcinoma?
Malignant cytotrophoblast and syncytiotrophoblast without chorionic villi.
What is the principal reproductive action of mifepristone?
Progesterone receptor antagonism, causing decidual breakdown and increased uterine sensitivity to prostaglandins.
2. Mnemonics
Mnemonic Title: Ectopic Pregnancy Presentation
PAB
Meaning: Pain → Amenorrhea → Bleeding. Think ectopic pregnancy when these occur together in early pregnancy.
Mnemonic Title: Post-Abortion Care Priorities
SAFE
Meaning: Stabilize → Assess complications → Follow-up/counseling → Educate about warning signs.
Mnemonic Title: Molar Pregnancy Clues
HIGH
Meaning: High hCG → Increased vomiting → Gestational-size discrepancy → Hyperthyroid / early hypertensive manifestations.
3. Memory Tables
Complete vs Partial Hydatidiform Mole
| Feature | Complete Mole | Partial Mole |
|---|---|---|
| Genetic pattern | Predominantly paternal nuclear genome | Triploidy with extra paternal set |
| Embryo / fetus | Absent | May be present but abnormal |
| Villous change | Diffuse hydropic swelling | Focal hydropic swelling |
| Persistent GTN risk | Higher | Lower |
Miscarriage vs Ectopic Pregnancy vs Hydatidiform Mole
| Feature | Miscarriage | Ectopic Pregnancy | Hydatidiform Mole |
|---|---|---|---|
| Typical pain | Cramping | Often unilateral | Not dominant |
| Key clue | Cervical status / retained tissue | Pregnancy location / internal bleeding | Excessive hCG manifestations |
| Major danger | Hemorrhage / infection | Rupture / hemoperitoneum | Persistent GTN |
4. Rapid Revision Points — Last-Minute Revision
Must Remember:
- Miscarriage type is interpreted using viability, cervical status and retained products.
- Many isolated early miscarriages result from chromosomal abnormalities of the conceptus.
- Septic miscarriage requires stabilization, antimicrobial therapy and treatment of retained infected tissue.
- Ectopic pregnancy results from implantation outside the normal endometrial cavity, most commonly in the tube.
- An empty uterus on one early scan does not by itself diagnose ectopic pregnancy.
- Hemodynamic instability in suspected ectopic pregnancy indicates possible rupture and major internal hemorrhage.
- Complete mole has diffuse villous abnormality and no embryo; partial mole may contain abnormal fetal tissue.
- Serial quantitative hCG after molar evacuation detects persistent trophoblastic activity.
- Choriocarcinoma spreads hematogenously and may produce hemorrhagic metastases.
- Mifepristone blocks progesterone receptors; heavy or prolonged bleeding after treatment requires reassessment.
KMU Exam Trap: Pregnancy of unknown location is not synonymous with ectopic pregnancy; serial β-hCG and repeat ultrasound may be required in a stable patient.
5. Clinical Memory Hooks
Early pregnancy bleeding + open cervix
→
pregnancy loss is progressing.
→
pregnancy loss is progressing.
Positive pregnancy test + unilateral pain + collapse
→
suspect ruptured ectopic pregnancy with internal hemorrhage.
→
suspect ruptured ectopic pregnancy with internal hemorrhage.
Very high hCG + excessive vomiting + abnormal intrauterine tissue
→
hydatidiform mole.
→
hydatidiform mole.
Persistent bleeding after pregnancy + rising hCG + lung lesions
→
gestational choriocarcinoma with hematogenous metastasis.
→
gestational choriocarcinoma with hematogenous metastasis.
6. ⭐ High-Yield Exam Points
- ⭐ Closed cervix + viable pregnancy + bleeding = threatened miscarriage.
- ⭐ Shoulder-tip pain in suspected ectopic pregnancy suggests blood irritating the diaphragm.
- ⭐ Unstable suspected ectopic pregnancy requires resuscitation and urgent surgical management.
- ⭐ Complete mole: no embryo, diffuse hydropic villi and more prominent trophoblastic proliferation.
- ⭐ Rising or plateauing hCG after molar evacuation suggests persistent gestational trophoblastic neoplasia.
- ⭐ Choriocarcinoma contains malignant cytotrophoblast and syncytiotrophoblast without chorionic villi.
- ⭐ Mifepristone antagonizes progesterone receptors and increases uterine responsiveness to prostaglandins.