Pregnancy HTN/DM Revision — MRCP Part 1

Crack Medicine
6 hours ago
3 min read

TL;DR

MRCP Part 1 frequently tests pregnancy medicine through hypertensive disorders and diabetes—know definitions, thresholds, drug safety, and complications. Focus on pre-eclampsia vs gestational HTN, insulin-first strategies in diabetes, and contraindicated drugs (ACEi/ARBs, statins). Expect data interpretation (BP, proteinuria, OGTT) and management steps. Revise with a checklist and practise with MCQs.

Why this matters

Pregnancy medicine is a high-yield, cross-cutting theme in MRCP Part 1. Questions often integrate physiology, pharmacology, and risk stratification. Hypertensive disorders and diabetes in pregnancy are repeatedly examined because they require precise definitions, safe prescribing, and staged management—all core competencies for physicians.

Use this page as a hub support for rapid revision, then consolidate with the MRCP Part 1 overview and apply knowledge using Free MRCP MCQs or Start a mock test.

Core sections

The 5 most tested subtopics

Classification of hypertensive disorders in pregnancy
- Chronic HTN: pre-existing or <20 weeks.
- Gestational HTN: ≥20 weeks, no proteinuria/end-organ damage.
- Pre-eclampsia: ≥20 weeks with proteinuria (≥300 mg/24 h) or maternal organ dysfunction and/or uteroplacental dysfunction.
- Superimposed pre-eclampsia: chronic HTN + new features.
Blood pressure thresholds & targets
- Treat persistent BP ≥150/100 mmHg.
- Severe HTN: ≥160/110 mmHg → urgent treatment.
- Typical target: 135/85–140/90 mmHg.
Safe antihypertensives
- First-line: labetalol
- Alternatives: nifedipine MR, methyldopa
- Avoid: ACE inhibitors, ARBs
Diabetes in pregnancy
- Screening with OGTT at 24–28 weeks (risk-based).
- Insulin is first-line when control inadequate.
- Metformin commonly used; glibenclamide second-line.
Complications & delivery planning
- HTN: placental abruption, IUGR, eclampsia.
- Diabetes: macrosomia, neonatal hypoglycaemia.
- Delivery timing depends on maternal and foetal risk.

High-yield revision table

Domain	Key facts to remember	Exam pearls
Pre-eclampsia	HTN ≥20 weeks + proteinuria or organ dysfunction	Headache, visual symptoms → severe disease
Severe HTN	≥160/110 mmHg	Treat urgently
First-line drugs	Labetalol	Avoid ACEi/ARBs
Eclampsia prevention	Magnesium sulphate	Also treats seizures
GDM diagnosis	OGTT thresholds	Common data interpretation Q
Treatment	Diet → metformin → insulin	Insulin safest
Foetal risks	Macrosomia	Polyhydramnios clue
Aspirin	Pre-eclampsia prevention	Start early

8–12 high-yield points

Proteinuria is not essential for pre-eclampsia diagnosis.
Magnesium sulphate prevents and treats eclampsia.
Labetalol is first-line antihypertensive.
Methyldopa may cause sedation/depression.
Nifedipine MR is a common alternative.
Low-dose aspirin reduces pre-eclampsia risk.
Pregnancy glucose targets are stricter.
Insulin requirements increase later in pregnancy.
Postpartum reassessment is essential.
Statins and ACEi/ARBs are contraindicated.
Foetal monitoring is key in both HTN and diabetes.
Delivery timing depends on severity and stability.

Practical examples / mini-cases

MCQ A 30-year-old primigravida at 32 weeks presents with BP 168/112 mmHg, headache, and visual disturbance. Urinalysis shows 2+ protein. What is the most appropriate immediate management?

A. MethyldopaB. ACE inhibitorC. IV labetalol + magnesium sulphateD. ObserveE. Statin

Answer: C

Explanation: Severe pre-eclampsia requires urgent BP control and seizure prophylaxis with magnesium sulphate. ACE inhibitors and statins are contraindicated.

Medical student revising pregnancy medicine topics for MRCP Part 1 exam

Common pitfalls

Using ACE inhibitors/ARBs in pregnancy
Missing severe features of pre-eclampsia
Over-relying on proteinuria
Incorrect glucose targets
Forgetting magnesium sulphate

Practical study-tip checklist

☐ Memorise definitions and thresholds
☐ Learn safe vs contraindicated drugs
☐ Practise OGTT interpretation
☐ Revise complications
☐ Drill emergency management
☐ Use Free MRCP MCQs
☐ Attempt a Start a mock test

FAQs

1) What BP requires urgent treatment?

≥160/110 mmHg requires urgent management to prevent complications.

2) Which antihypertensives are safe?

Labetalol, nifedipine, and methyldopa are commonly used.

3) How is gestational diabetes treated?

Diet → metformin → insulin depending on control.

4) When is magnesium sulphate used?

For prevention and treatment of eclampsia.

5) Is proteinuria essential?

No—organ dysfunction alone can establish diagnosis.

Ready to start?

Build a strong foundation with the MRCP Part 1 overview, then test your knowledge using Free MRCP MCQs and full-length exams via Start a mock test. Link this topic into your wider study plan for efficient revision.