Pregnancy Medicine

Pregnancy Medicine UK Medical PG Question 1: A 28-year-old woman at 34 weeks gestation presents with sudden onset severe headache and seizures. Her BP is 180/120 mmHg. What is the most appropriate immediate treatment?

• A. Labetalol IV
• B. Magnesium sulfate IV (Correct Answer)
• C. Immediate cesarean section
• D. Diazepam IV
• E. Mannitol IV

Pregnancy Medicine Explanation: ***Magnesium sulfate IV***- **Magnesium sulfate** is the first-line and definitive treatment for the prevention and cessation of seizures in women with **eclampsia**.- It acts by stabilizing neuronal membranes and reducing neuromuscular irritability, providing effective seizure control superior to traditional *anticonvulsants*.*Labetalol IV*- Labetalol is an **antihypertensive** used to manage severe *hypertension* (BP 160/110 mmHg) in preeclampsia/eclampsia, but it does not treat or prevent the underlying seizures.- Control of blood pressure is secondary to achieving **seizure cessation** and prevention with magnesium sulfate in the immediate management protocol.*Immediate cesarean section*- Delivery is the definitive cure for eclampsia and severe preeclampsia, but immediate **maternal stabilization**, including seizure control (MgSO4) and blood pressure management, must precede delivery unless other emergent obstetric indications exist.- A planned delivery is necessary once the patient is stable, but the *seizures* must be controlled first, making MgSO4 the most **immediate** necessary step.*Diazepam IV*- While an effective general anticonvulsant, **diazepam** is generally reserved as a *second-line agent* if seizures persist despite adequate administration of magnesium sulfate.- Magnesium sulfate is preferred because it is more effective for eclamptic seizures and carries a lower risk of fetal respiratory depression and **neonatal hypotonia** compared to benzodiazepines.*Mannitol IV*- **Mannitol** is an osmotic diuretic primarily used to reduce increased *intracranial pressure* (ICP) or treat cerebral edema.- It is not the primary immediate agent for *seizure control* in eclampsia, which requires **magnesium sulfate**.

Pregnancy Medicine UK Medical PG Question 2: A 37-year-old woman presents with fatigue, joint pain, and a photosensitive rash. She is anti-Ro positive and planning pregnancy. What is the recommended fetal monitoring?

• A. Monthly ultrasounds
• B. Serial fetal echocardiograms (Correct Answer)
• C. Amniocentesis
• D. Chorionic villus sampling
• E. No additional monitoring

Pregnancy Medicine Explanation: ***Serial fetal echocardiograms***- Anti-Ro (SSA) antibodies cross the placenta and target the **fetal cardiac conduction system**, causing **congenital heart block (CHB)**, a serious complication.- Serial monitoring with fetal echocardiograms (starting around 16–18 weeks gestation) is crucial to detect early signs of CHB, allowing for timely treatment with maternal **fluorinated steroids**.*Monthly ultrasounds*- Standard monthly ultrasounds primarily monitor fetal growth and amniotic fluid volume but are often insufficient to reliably detect subtle changes in **fetal heart rhythm** characteristic of early CHB.- A dedicated **fetal echocardiogram** uses specialized techniques to visualize cardiac structures and assess the conduction system comprehensively.*Amniocentesis*- This is an invasive procedure used for **prenatal diagnosis of genetic and chromosomal disorders** by analyzing amniotic fluid, not for routine monitoring of cardiac function or rhythm.- The primary goal in an anti-Ro positive pregnancy is surveillance for development of CHB, which does not require genetic testing.*Chorionic villus sampling*- CVS is an invasive procedure typically performed in the first trimester (10–13 weeks) for **genetic and chromosomal analysis**.- It is not indicated for the surveillance or diagnosis of **fetal conduction abnormalities** caused by maternal autoantibodies, which usually manifest later in the second trimester (16–26 weeks).*No additional monitoring*- This approach is dangerous because **Anti-Ro antibodies** confer a 1–2% risk of the fetus developing **congenital heart block**, requiring specialized cardiac surveillance to prevent adverse outcomes.- Lack of appropriate surveillance can lead to late diagnosis of CHB, potentially resulting in **fetal hydrops** or the need for an immediate **pacemaker** after birth.

Pregnancy Medicine UK Medical PG Question 3: A 33-year-old woman at 30 weeks gestation presents with sudden onset dyspnea and chest pain. She has a swollen left leg. D-dimer is elevated. What is the most appropriate investigation?

• A. Chest X-ray
• B. V/Q scan
• C. CT pulmonary angiogram
• D. Compression ultrasound of leg (Correct Answer)
• E. Arterial blood gas

Pregnancy Medicine Explanation: ***Compression ultrasound of leg***- Given the clinical triad of sudden onset **dyspnea**, **chest pain**, a **swollen left leg**, and an elevated **D-dimer** in a pregnant woman, there is a high suspicion for **pulmonary embolism (PE)** secondary to **deep vein thrombosis (DVT)**.- **Compression ultrasound** is the most appropriate initial investigation as it is non-invasive and uses no ionizing radiation, making it safe in pregnancy. Confirming **DVT** in the leg allows for immediate initiation of **anticoagulation** for **venous thromboembolism (VTE)** without necessarily needing further chest imaging, thereby minimizing fetal radiation exposure.*Chest X-ray*- A **chest X-ray (CXR)** is often performed to rule out other causes of dyspnea (e.g., pneumonia, pneumothorax) and to assess if a subsequent **V/Q scan** would be interpretable (i.e., normal CXR is ideal for V/Q scan).- While important for initial assessment, a **CXR** is not diagnostic for **DVT** or **PE** itself and cannot confirm the presence of VTE to guide specific therapy.*V/Q scan*- A **ventilation-perfusion (V/Q) scan** uses less radiation than a **CT pulmonary angiogram (CTPA)** and is generally preferred in pregnancy if pulmonary imaging is deemed necessary.- However, if **DVT** is confirmed by ultrasound, treatment for **VTE** can be initiated without the need for immediate pulmonary imaging, especially given the clinical picture strongly pointing towards DVT as the source.*CT pulmonary angiogram*- A **CT pulmonary angiogram (CTPA)** is highly sensitive and specific for diagnosing **PE** and is preferred in cases where **V/Q scan** is inconclusive or unavailable, or in hemodynamically unstable patients.- However, **CTPA** delivers higher doses of ionizing radiation to both the **mother (breasts)** and the **fetus** compared to a V/Q scan or a non-radiating ultrasound, making the latter a safer initial diagnostic step in pregnancy when DVT is suspected.*Arterial blood gas*- An **arterial blood gas (ABG)** is useful for assessing the severity of respiratory compromise in patients with suspected **PE**, typically showing **hypoxemia** and **respiratory alkalosis** due to hyperventilation.- However, an **ABG** is not a diagnostic tool for **DVT** or **PE** itself and cannot confirm the presence or location of the thrombus to guide specific anticoagulant therapy.

Pregnancy Medicine UK Medical PG Question 4: A 36-year-old woman at 34 weeks gestation develops sudden onset severe abdominal pain and vaginal bleeding. Her previous delivery was by cesarean section. Fetal heart rate shows bradycardia. What is the most likely diagnosis?

• A. Placental abruption
• B. Uterine rupture (Correct Answer)
• C. Placenta previa
• D. Vasa previa
• E. Preterm labor

Pregnancy Medicine Explanation: ***Uterine rupture***- The presence of **sudden, severe abdominal pain**, **vaginal bleeding**, and profound **fetal bradycardia** in a woman with a history of **previous Cesarean section** is highly classic for uterine rupture, a catastrophic obstetrical emergency.- The prior CS scar is the most common predisposing factor, and the severe pain, often followed by retraction of the fetal presenting part, results from the tearing of the myometrium, leading to acute fetal compromise and maternal hemorrhage.*Placental abruption*- While it causes painful bleeding and potential fetal distress, placental abruption pain is typically sustained, associated with a **rigid (tender, hypertonic) uterus**, and is usually not described as a catastrophic tear.- Although fetal bradycardia can occur, the combination of **severe pain** and a **prior CS scar** makes rupture the more immediate concern.*Placenta previa*- Placenta previa typically presents as **painless bright red vaginal bleeding** and usually does not cause **severe abdominal pain** unless complicated by coexisting abruption, which is less common.- Fetal distress is less frequent in *previa* unless bleeding is massive enough to cause maternal shock, unlike the acute compromise suggested by profound bradycardia here.*Vasa previa*- This condition is characterized by **fetal vessel rupture** (often after membrane rupture) and primarily causes fetal blood loss, leading to rapid **fetal compromise** (bradycardia/sinusoidal trace).- *Vasa previa* bleeding is usually not associated with the severe maternal **abdominal pain** or the massive maternal hemorrhage expected with uterine rupture or abruption.*Preterm labor*- Preterm labor pain is characterized by **rhythmic uterine contractions** that lead to cervical change, not the **sudden, severe, non-contractile pain** associated with tissue tearing.- While preterm labor can sometimes be accompanied by some bleeding (bloody show), it does not typically result in the immediate, catastrophic **fetal bradycardia** seen here, which suggests acute compromise.

Pregnancy Medicine UK Medical PG Question 5: A 34-year-old woman at 28 weeks gestation presents with severe itching, particularly on palms and soles. Bile acids are elevated. What is the most likely diagnosis?

• A. Atopic dermatitis
• B. Intrahepatic cholestasis of pregnancy (Correct Answer)
• C. HELLP syndrome
• D. Acute fatty liver of pregnancy
• E. Scabies

Pregnancy Medicine Explanation: ***Intrahepatic cholestasis of pregnancy*** - The presentation of severe, generalized **pruritus**, especially on the **palms and soles**, during the third trimester is highly characteristic of this condition. - The definitive diagnosis relies on elevated serum **bile acids** (>10 µmol/L) in the absence of other primary liver pathology.*Atopic dermatitis* - This condition is characterized by an **eczematous rash** (papules, plaques) and is generally not localized solely to the palms and soles as isolated, severe pruritus. - It is a primary dermatological condition and does not result in the diagnostic elevation of serum **bile acids** seen in cholestasis.*HELLP syndrome* - HELLP is a life-threatening complication characterized by **H**emolysis, **E**levated **L**iver enzymes, and **L**ow **P**latelets, causing severe systemic illness (e.g., abdominal pain, nausea). - While it involves liver pathology, severe isolated pruritus and elevated bile acids are defining features of ICP, not **HELLP**.*Acute fatty liver of pregnancy* - AFLP is a fulminant process presenting with nausea, vomiting, **hypoglycemia**, coagulopathy, and **hepatic failure** (often requiring intensive care). - The clinical picture here is limited to isolated pruritus and elevated bile acids, which does not fit the severe systemic compromise or **acute liver failure** seen in AFLP.*Scabies* - Scabies is a skin infestation resulting in intensely pruritic papules and **burrows**, typically found in the finger web spaces, wrists, and belt line. - This diagnosis would not account for the significant elevation of **bile acids** found on laboratory testing, which indicates a hepatobiliary issue.

Pregnancy Medicine Flashcard 1 of 5

Question: What is the first-line pharmacological management of pre-eclampsia? _____

Answer: Labetalol

Pregnancy Medicine Flashcard 2 of 5

Question: Pre-eclampsia consequences include _____

Answer: placental abruption

Pregnancy Medicine Flashcard 3 of 5

Question: All obese women should be screened for gestational diabetes with an _____ at 24-28 weeks

Answer: oral glucose tolerance test (OGTT)

Pregnancy Medicine Flashcard 4 of 5

Question: What syndrome can develop as a complication of severe postpartum haemorrhage (PPH) _____

Answer: Sheehan's syndrome

Pregnancy Medicine Flashcard 5 of 5

Question: Placental abruptions are acute obstetric _____ and needs to be dealth with immediately

Answer: emergencies