Chest Pain History OSCE — SOCRATES, Red Flags, and Differential Diagnosis

Introduction

Chest pain is one of the most common and highest-stakes OSCE history stations. Your job is to use SOCRATES to characterise the pain, systematically work through the life-threatening differentials, and present a reasoned impression. Examiners reward structured thinking and explicit safety-netting.

SOCRATES for Chest Pain

The Life-Threatening Differentials

ACS (STEMI / NSTEMI / Unstable Angina)

• Central, crushing, heavy pain radiating to left arm or jaw
• Associated sweating, nausea, dyspnoea
• Risk factors: smoking, diabetes, hypertension, hypercholesterolaemia, family history, previous cardiac disease
• Previous similar episodes? GTN use? Duration > 20 minutes = ACS until proven otherwise

Aortic Dissection

• Sudden onset, severe, tearing pain radiating to the interscapular area
• Ask about hypertension (most important risk factor), Marfan syndrome, bicuspid aortic valve
• Differential blood pressure between arms, pulse deficits, neurological symptoms

Pulmonary Embolism

• Sudden onset pleuritic chest pain, dyspnoea, haemoptysis
• Wells score risk factors: recent immobility, long-haul flight, malignancy, previous DVT/PE, leg swelling, pregnancy, OCP

Tension Pneumothorax

• Sudden severe unilateral chest pain with dyspnoea, typically in tall thin young men or post-procedurally
• Tracheal deviation away, absent breath sounds, haemodynamic compromise

Additional History Components

Cardiovascular Risk Factors

• Hypertension, hypercholesterolaemia, diabetes mellitus
• Smoking (pack years), family history of early IHD (first-degree relative under 60)
• Obesity, physical inactivity

Past Medical History

• Previous MI, PCI, CABG, angina
• Known aortic aneurysm or valve disease
• Recent surgery or immobilisation (PE risk)

Drug History

• GTN use — does it relieve pain?
• Anticoagulants, antiplatelets (affects management)
• Cocaine use (causes coronary vasospasm and dissection)

ICE

• "What do you think might be causing this?"
• "What are you most worried about?" (cardiac fears are common)
• "How is this affecting your daily life?"

Safety Netting

"If the pain comes back, becomes more severe, or you develop breathlessness, sweating, or pain down your arm, please call 999 immediately and do not drive yourself to hospital."

How to Present

"This is a 58-year-old male smoker with known hypertension presenting with a 2-hour history of severe central crushing chest pain radiating to the left arm, associated with sweating and nausea. The pain is not relieved by GTN. There is no pleuritic component, no haemoptysis, and no interscapular radiation. The most likely diagnosis is an acute coronary syndrome. I would manage this as a STEMI until proven otherwise with an urgent 12-lead ECG and immediate cardiology review."

"How do you differentiate cardiac from pleuritic chest pain?"

Cardiac pain is typically central, heavy or crushing in character, radiates to the left arm or jaw, and is worsened by exertion but not by breathing or movement. Pleuritic pain is typically sharp and localised, worsened by inspiration, coughing, or movement, and suggests pleural inflammation from causes such as pulmonary embolism, pneumonia, or pericarditis.

"What features suggest aortic dissection rather than ACS?"

Aortic dissection classically presents with sudden severe tearing pain radiating to the interscapular region, in a patient with known hypertension or Marfan syndrome. Key distinguishing features include differential blood pressure between the arms (over 20 mmHg), pulse deficits, neurological symptoms (arm or leg ischaemia), and a normal or non-diagnostic ECG.

"What risk factors would you ask about for pulmonary embolism?"

Use the Wells criteria: recent immobility (long journey, bed rest), recent surgery (especially lower limb orthopaedic), active malignancy, previous DVT or PE, unilateral calf swelling or DVT signs, haemoptysis, oral contraceptive pill or HRT, pregnancy or post-partum state, and family history of thrombophilia.

"When would you safety net a patient with chest pain?"

All patients discharged with chest pain should be instructed to call 999 immediately if: pain returns or worsens, becomes more severe, is accompanied by breathlessness, sweating, or radiation to the arm or jaw. They should not drive themselves to hospital if experiencing these symptoms. Written safety netting information should also be provided.

Related guides: How to Take a Cardiology History OSCE | ECG Interpretation OSCE | A&E Assessment OSCE | Cardiovascular Examination OSCE