OSCE: Ectopic pregnancy

1. OSCE Station Overview

Scenario:
- You are given an ultrasound indicating a suspected ectopic pregnancy (e.g., no intrauterine gestational sac, possible adnexal mass, or free fluid in the pouch of Douglas).
- The examiner may ask you to take a focused history from the patient to confirm suspicion. Alternatively, they may ask you to discuss management options based on the ultrasound findings.
Examiner Emphasis:
- History Taking: Professors often highlight the importance of eliciting a detailed, structured history (especially LMP, risk factors, and typical symptoms).
- Management: Know the basics of medical vs. surgical management and how to decide between them.

2. Focused History Taking: Key Points

In an OSCE setting, you’ll have limited time. Aim for a structured, succinct history:

2.1 Presenting Complaint

Ask about pain: “When did the pelvic/abdominal pain start? Where is it located? How severe is it?”
Ask about bleeding: “Have you noticed any vaginal bleeding or spotting? How heavy is it?”

2.2 Obstetric History

LMP (Last Menstrual Period): Establish whether the patient is late for her period.
Previous pregnancies: Any history of miscarriages or ectopic pregnancies.
Contraceptive use: Intrauterine devices, history of tubal ligation, etc.

2.3 Gynecological & Medical History

PID or STIs: Pelvic Inflammatory Disease raises ectopic risk.
Previous pelvic surgeries: e.g., tubal surgery, cesarean section, sterilization.
Fertility treatments: IVF or other assisted reproductive techniques (increases risk of heterotopic pregnancy).
Social history: Smoking is linked to higher ectopic risk; multiple sexual partners can increase PID risk.

2.4 Associated Symptoms

Dizziness or fainting: Could suggest internal bleeding.
Shoulder tip pain: Referred pain from diaphragmatic irritation if there’s intra-abdominal bleeding.

OSCE Tip: Be sure to maintain a patient-centered approach, using empathetic language. Summarize key points back to the patient to confirm understanding.

3. Relevant Ultrasound Findings (in Brief)

If the examiner asks you to interpret or comment on the ultrasound:

No Intrauterine Gestational Sac: With a sufficiently elevated β-hCG (above the discriminatory zone of ~1,500 mIU/mL), this finding strongly suggests ectopic.
Adnexal Mass: May be a “tubal ring” or a “bagel/donut sign” indicative of an extrauterine sac.
Free Fluid in the Pouch of Douglas: Suggestive of rupture if significant fluid is present.

OSCE Tip: Explain succinctly how these ultrasound findings correlate with an ectopic pregnancy diagnosis.

4. Outline of Management

After taking a focused history or interpreting the ultrasound, you may be asked: “How would you manage this patient?”

4.1 Stability First

Check Vital Signs: If unstable (tachycardic, hypotensive), suspect rupture → urgent surgical intervention.

4.2 Medical Management (Methotrexate)

Criteria: Hemodynamic stability, unruptured ectopic, no fetal heartbeat, β-hCG typically <5,000 mIU/mL, and mass <3–4 cm.
Follow-Up: Patients need close β-hCG monitoring until undetectable.
Contraindications: Rupture, significant internal bleeding, abnormal liver/kidney function, inability to comply with follow-up.

4.3 Surgical Management

Indications: Hemodynamic instability, rupture, contraindications to methotrexate, or failure of medical therapy.
Options:
- Salpingostomy: Incision to remove the ectopic while preserving the tube.
- Salpingectomy: Removal of the entire fallopian tube (common if the tube is severely damaged or if the patient has completed childbearing).

OSCE Tip: In your answer, prioritize the patient’s current condition, mention resuscitation if unstable, and then decide on medical vs. surgical management.

5. Practical OSCE Flow

Introduction & Consent
- Greet the patient, confirm identity, and explain the purpose of your assessment.
Focused History (5–6 minutes)
- Symptoms: Pain, bleeding.
- LMP, pregnancy tests, prior ectopic or PID, fertility treatments, etc.
Interpret Ultrasound (if asked)
- “Here, we don’t see a gestational sac in the uterus, but we do see a suspicious adnexal mass.”
- “There is/There isn’t free fluid suggesting possible rupture.”
Formulate a Management Plan
- Emphasize patient stability.
- Medical therapy (Methotrexate) if stable and meeting criteria.
- Surgical intervention if unstable or not a candidate for Methotrexate.
Counseling & Follow-Up
- Explain the diagnosis clearly (risk of rupture, need for follow-up β-hCG).
- Discuss future pregnancy risks (recurrence risk ~10–14%).
- Ensure emotional support and address fertility concerns.

6. High-Yield Phrases for the OSCE

“When was your last menstrual period? Are you sure of your dates?”
“Have you had any shoulder-tip pain or dizziness?” (screens for possible internal bleeding)
“Do you have any risk factors such as a previous ectopic, PID, or tubal surgery?”
“Your ultrasound shows no pregnancy sac in your uterus, but there is a concerning mass in your fallopian tube.”
“Because you are stable/unstable, our next step is to consider Methotrexate vs. urgent surgery.”
“We will closely monitor your β-hCG levels to ensure they fall to zero.”

Key Takeaway

In an OSCE station highlighting ectopic pregnancy, history taking is often just as important as knowing how to manage the condition.
Thoroughly ask about risk factors and current symptoms that point to a ruptured vs. unruptured ectopic.
Interpret the ultrasound findings logically, linking them to ectopic pregnancy.
Provide a clear management plan, always considering patient stability, β-hCG levels, and any contraindications to medical therapy.

By balancing structured history-taking with concise, evidence-based management discussions, you’ll be well-prepared for any ectopic pregnancy OSCE scenario—whether the examiner focuses on history, ultrasound interpretation, or management.