Master Neurology
for MRCP Part 1

What the MRCP Part 1 Tests in Neurology

MRCP Part 1 Neurology tests the ability to localise lesions (e.g., distinguishing upper from lower motor neuron signs, cerebellar vs. sensory ataxia), recognise classic presentations (e.g., transient ischaemic attack, migraine with aura, Guillain-Barré syndrome), and apply diagnostic criteria (e.g., McDonald criteria for multiple sclerosis, NINDS for stroke). Questions focus on first-line investigations (CT/MRI, lumbar puncture, nerve conduction studies) and emergency management (thrombolysis in stroke, IVIG in Guillain-Barré, antiepileptics in status epilepticus). Candidates must know key drug side effects (e.g., phenytoin causing nystagmus, carbamazepine causing hyponatraemia) and red flags (e.g., thunderclap headache in subarachnoid haemorrhage, evolving stroke symptoms). Emphasis is on clinical reasoning, not rare diseases.

High-Yield Concepts

• Stroke and TIA: ABCD2 Score and Thrombolysis: ABCD2 score (Age ≥60=1, BP ≥140/90=1, Clinical features: unilateral weakness=2, speech deficit without weakness=1, Duration ≥60 min=2, 10-59 min=1, Diabetes=1) stratifies TIA risk: score ≥4 warrants urgent assessment. For ischaemic stroke, IV alteplase (0.9 mg/kg, max 90 mg) within 4.5 hours, with exclusion criteria including INR >1.7, glucose <2.7 or >22.2 mmol/L, and BP >185/110 mmHg.
• Multiple Sclerosis: McDonald Criteria 2017: Diagnosis requires dissemination in space (≥2 CNS lesions on MRI) and time (new lesion on follow-up MRI or simultaneous presence of enhancing and non-enhancing lesions). CSF oligoclonal bands can substitute for dissemination in time. First-line disease-modifying therapy includes interferon beta, glatiramer acetate, or dimethyl fumarate; severe relapses treated with IV methylprednisolone 1g daily for 3-5 days.
• Guillain-Barré Syndrome: Diagnostic Criteria and Management: Progressive, symmetrical ascending weakness with areflexia, often post-infection (Campylobacter jejuni, CMV, EBV). CSF shows albuminocytologic dissociation (elevated protein, normal WBC). Nerve conduction studies show demyelinating pattern (prolonged distal latencies, conduction block). Treatment: IVIG 0.4 g/kg/day for 5 days or plasma exchange; monitor for autonomic instability and respiratory failure (vital capacity <20 mL/kg indicates need for ICU).
• Status Epilepticus: Treatment Algorithm: Definition: seizure >5 minutes or recurrent seizures without recovery. Step 1: IV lorazepam 4 mg (or buccal midazolam 10 mg). Step 2: IV phenytoin 18 mg/kg (max 50 mg/min) or levetiracetam 60 mg/kg. Step 3: IV anaesthesia (propofol or thiopental) with EEG monitoring. Check glucose, electrolytes, and drug levels; consider pyridoxine in refractory cases.
• Migraine: Diagnosis and Acute/Prophylactic Treatment: Diagnosis: ≥5 attacks with 4-72 hour duration, unilateral, pulsating, moderate/severe, aggravated by routine activity, plus nausea/vomiting or photophobia/phonophobia. Aura: fully reversible visual/sensory/speech symptoms lasting 5-60 min. Acute treatment: triptans (sumatriptan 50-100 mg PO or 6 mg SC) plus NSAIDs. Prophylaxis: propranolol 40-160 mg daily, amitriptyline 10-50 mg, or topiramate 25-200 mg.
• Parkinson's Disease: UK Brain Bank Criteria and Treatment: Core features: bradykinesia plus at least one of rigidity, rest tremor (4-6 Hz), or postural instability. Supportive: unilateral onset, persistent asymmetry, excellent response to levodopa. First-line: levodopa/carbidopa for motor symptoms; dopamine agonists (pramipexole, ropinirole) for younger patients; MAO-B inhibitors (selegiline) as adjunct. Avoid antipsychotics except clozapine or quetiapine for psychosis.
• Subarachnoid Haemorrhage: Grading and Management: Classic presentation: thunderclap headache (peak within seconds). CT head within 6 hours has >99% sensitivity; if negative, lumbar puncture for xanthochromia (bilirubin). Hunt and Hess grade: I (mild headache) to V (comatose). Management: urgent neurosurgical referral, nimodipine 60 mg every 4 hours for 21 days to prevent vasospasm, maintain euvolemia, and secure aneurysm via coiling or clipping.
• Neurological Emergencies: Cauda Equina Syndrome and Meningitis: Cauda equina: bilateral sciatica, saddle anaesthesia, urinary retention, loss of anal tone. Emergency MRI spine; surgical decompression within 24-48 hours. Bacterial meningitis: empiric IV ceftriaxone 2g BD plus dexamethasone 10 mg QDS (before or with first antibiotic) and vancomycin if resistant pneumococcus suspected. Kernig's sign and Brudzinski's sign are classic but low sensitivity.

Common Traps in Neurology Questions

• Confusing upper motor neuron signs (spasticity, hyperreflexia, Babinski) with lower motor neuron (fasciculations, atrophy, hyporeflexia) in conditions like ALS where both can coexist.
• Assuming a normal CT head rules out subarachnoid haemorrhage; always check lumbar puncture for xanthochromia if CT is negative and suspicion is high.
• Using benzodiazepines alone for status epilepticus without loading a long-acting antiepileptic; this leads to seizure recurrence within 20-30 minutes.
• Misdiagnosing benign paroxysmal positional vertigo as cerebellar stroke; the Dix-Hallpike test and nystagmus direction (fatigable, geotropic) differentiate.
• Forgetting that IVIG in Guillain-Barré can cause aseptic meningitis, renal failure, and thrombosis; monitor renal function and hydration.
• Treating Parkinson's psychosis with typical antipsychotics (haloperidol) which worsen motor symptoms; always use clozapine or quetiapine.

How to Revise Neurology for the MRCP Part 1

For MRCP Part 1 Neurology, prioritise stroke (ABCD2, thrombolysis criteria, haemorrhage vs. ischaemia), epilepsy (status treatment algorithm, first-line monotherapy for focal vs. generalised), and headache (migraine criteria, cluster headache, medication-overuse headache). Questions often present a clinical vignette with a single best answer requiring lesion localisation (e.g., Weber syndrome, lateral medullary syndrome) or treatment decision (e.g., when to start anticoagulation in atrial fibrillation with stroke). Practise interpreting MRI/CT images (infarct patterns, haemorrhage types) and nerve conduction study results. Focus on guidelines from NICE and SIGN, and memorise key cut-offs (e.g., 4.5 hours for thrombolysis, 5 minutes for status epilepticus). Avoid rare syndromes; emphasis is on common, treatable conditions.

Practise it: MedLumen has 50 Neurology questions for the MRCP Part 1, each with a full explanation and references.