What dose of aspirin does NICE recommend for a suspected heart attack?

NG185 says offer a single loading dose of 300 mg aspirin as soon as possible, for STEMI and for unstable angina or NSTEMI, unless there is clear evidence of allergy. Dual antiplatelet therapy waits until the diagnosis is made.

Should I give oxygen to a patient with chest pain?

Only if they are hypoxaemic. The BTS guideline gives a target of 94 to 98% for most acutely ill adults and does not give oxygen to patients who are not hypoxaemic.

What is the GRACE score for?

NG185 uses an established risk score such as GRACE to predict 6-month mortality once unstable angina or NSTEMI is diagnosed. A predicted mortality above 3.0% is the threshold at which NG185 says consider coronary angiography within 72 hours of first admission.

What is the time window for primary PCI?

NG185 offers primary PCI as the preferred reperfusion strategy when presentation is within 12 hours of symptom onset and PCI can be delivered within 120 minutes of the time fibrinolysis could have been given, and considers it beyond 12 hours if ischaemia continues.

How do I know whether post-operative chest pain is a pulmonary embolism?

Score the NG158 two-level Wells score, in which surgery in the previous 4 weeks gives 1.5 points. More than 4 points means PE is likely and a CTPA immediately; 4 or less means a D-dimer within 4 hours.

Can I anticoagulate a patient two days after surgery?

Only after discussing the bleeding risk with the operating surgeon. NG158's first-line options for confirmed PE are apixaban or rivaroxaban, but the timing and choice in a fresh post-operative patient are a joint decision.

Post-op Chest Pain: CST Interview Clinical Station Answer

Post-operative chest pain is a symptom with two dangerous cardiorespiratory causes, acute coronary syndrome and pulmonary embolism, and a surgical differential that includes an anastomotic leak, a perforation and a pneumothorax. The CST answer is ABCDE with an ECG in hand, oxygen only if hypoxaemic, a 300 mg aspirin loading dose under NICE NG185 if the ECG or story says coronary, a Wells score under NG158 if it says embolus, and an early call to the medical registrar.

Key takeaways

According to NICE NG185, offer a single loading dose of 300 mg aspirin as soon as possible to people with STEMI and to people with unstable angina or NSTEMI, unless allergic.
NG185 says do not offer dual antiplatelet therapy before a diagnosis of unstable angina or NSTEMI is made, which matters in a patient who may need to return to theatre.
For NSTEMI, NG185 offers fondaparinux unless there is a high bleeding risk or immediate angiography, uses the GRACE score to predict 6-month mortality, and considers angiography within 72 hours when that risk is above 3.0%.
For STEMI, NG185 offers primary PCI when presentation is within 12 hours of symptom onset and PCI can be delivered within 120 minutes of the time fibrinolysis could have been given.
The BTS oxygen guideline does not give oxygen to patients who are not hypoxaemic; the target is 94 to 98%.
Surgery in the previous 4 weeks scores 1.5 points on the NG158 two-level Wells score, and more than 4 points means an immediate CTPA.

How do I recognise the dangerous causes of post-operative chest pain?

Recognise them from the character of the pain and the ECG. Central crushing pain with sweating and ST changes is coronary; sudden pleuritic pain with tachycardia, hypoxaemia and a clear chest is embolic; pain with a rigid abdomen and a fever is a leak or a perforation presenting upwards.

What is the full differential?

Acute coronary syndrome: peri-operative myocardial infarction is often painless or atypical, especially in diabetics and the elderly, so a troponin belongs in every hypotensive or breathless post-operative patient
Pulmonary embolism: pleuritic pain, tachycardia, hypoxaemia, a clear X-ray, a swollen calf
Pneumonia or atelectasis: fever, cough, consolidation
Pneumothorax: after a central line, a thoracic procedure or ventilation
Surgical: an anastomotic leak, a perforation, a subphrenic collection irritating the diaphragm, or oesophageal injury after upper GI surgery
Musculoskeletal and gastro-oesophageal: chest wall pain from positioning, reflux, and pain referred from the epigastrium

However typical the cardiac story, the panel is checking that you name the surgical causes. A day-five patient after an oesophagectomy with chest pain and a tachycardia has a leak until proven otherwise.

What is the immediate management from A to E?

Immediate management is ABCDE with a 12-lead ECG recorded during the primary survey, oxygen only if saturations are below target, intravenous access with a troponin and a gas, analgesia, and aspirin 300 mg if an acute coronary syndrome is suspected and the operating surgeon does not veto it.

Airway and breathing: respiratory rate, saturations, tracheal position and breath sounds; oxygen to 94 to 98% only if hypoxaemic, as the BTS guideline directs
Circulation: pulse, blood pressure in both arms, capillary refill, jugular venous pressure; access, full blood count, urea and electrolytes, troponin, clotting, a venous gas and a 12-lead ECG
Circulation: 300 mg aspirin under NG185 for suspected ACS, unless allergic, after a word with the surgeon about bleeding
Disability: conscious level, glucose, and the analgesia given so far
Exposure: temperature, the wound, the abdomen, the calves and the drains

According to NICE NG185, do not offer dual antiplatelet therapy before the diagnosis is made. That single sentence protects a patient who may be back in theatre tonight.

Which investigations separate ACS, PE and the surgical causes?

The decisive investigations are the 12-lead ECG, a troponin with a repeat, a chest X-ray, and either a CTPA or a CT of the chest and abdomen with contrast depending on the story. The ECG separates STEMI from everything else; the troponin trend separates infarction from strain; the X-ray finds a pneumothorax, consolidation or free air under the diaphragm.

How do I decide on a CTPA?

Use the NG158 two-level Wells score. Surgery in the previous 4 weeks scores 1.5, a heart rate over 100 scores 1.5, clinical signs of DVT score 3, and an alternative diagnosis being less likely scores 3. More than 4 points means PE is likely and a CTPA immediately, or interim anticoagulation if it cannot be done immediately; 4 points or less means a D-dimer with the result within 4 hours.

For a suspected leak or perforation the test is a CT of the abdomen and pelvis with intravenous contrast, and the person to speak to is the operating surgeon, not the radiologist alone.

What is the definitive management of each cause?

Definitive management follows the diagnosis and, for the cardiac causes, follows NICE NG185 with the surgeon's bleeding risk in the conversation at every step.

Acute coronary syndrome under NG185

STEMI: aspirin 300 mg, and coronary angiography with primary PCI if presentation is within 12 hours of onset and PCI can be delivered within 120 minutes of when fibrinolysis could have been given; consider it beyond 12 hours if ischaemia continues
NSTEMI or unstable angina: aspirin 300 mg, fondaparinux unless high bleeding risk or immediate angiography, unfractionated heparin instead if the creatinine is above 265 micromol/L, and a GRACE score
NSTEMI with a predicted 6-month mortality above 3.0%: consider angiography within 72 hours of first admission
Every case: the second antiplatelet is chosen by the cardiologist once the diagnosis is confirmed and the surgeon has agreed

Pulmonary embolism under NG158

NG158 offers apixaban or rivaroxaban for confirmed PE, and for PE with haemodynamic instability a continuous unfractionated heparin infusion with thrombolysis considered. In the first days after surgery the anticoagulant, its timing and the bleeding risk are decided with the operating consultant.

The surgical causes

A leak or perforation is treated as sepsis with source control: antibiotics within 1 hour under NG253, a CT if stable, and a return to theatre or radiological drainage decided by the consultant. A pneumothorax after a line needs a chest drain if it is large or the patient is compromised.

When do I escalate, and who do I call?

Escalate to the surgical registrar for every patient with chest pain, and to the medical registrar as soon as the ECG or troponin suggests a coronary cause, because the cardiology decisions under NG185 are theirs. A STEMI is a call to the primary PCI centre through the medical team, immediately.

STEMI on the ECG: the medical registrar and the PCI pathway now; the surgical consultant informed about antiplatelets and bleeding
Suspected PE with hypotension: critical care and the medical registrar, for heparin and thrombolysis under NG158
Suspected leak or perforation: the operating consultant, tonight
Any anticoagulant or antiplatelet in the first post-operative days: the operating surgeon before the first dose

What is the interviewer listening for?

An ECG in the primary survey, and oxygen only to a target
Aspirin 300 mg under NG185, and the rule against dual antiplatelets before diagnosis
The Wells score used correctly, with the surgery point, and the NG158 pathway that follows
The surgical causes named without prompting
The bleeding-risk conversation with the surgeon before any anticoagulant, and early involvement of the medical team

What are the common mistakes?

Giving high-flow oxygen to a patient with normal saturations
Starting clopidogrel or ticagrelor on the ward before a diagnosis
Missing the silent infarction in a hypotensive diabetic
Treating chest pain after upper GI surgery as cardiac without considering a leak
Anticoagulating a fresh post-operative patient without telling the surgeon

How this comes up at the CST interview

The CST management and clinical station scores a structured approach, knowledge, prioritisation and communication. Chest pain tests whether you can hold two guideline pathways in your head, keep the surgical differential alive, and negotiate the bleeding risk with two teams at once.

coresurgeryinterview has 299 questions and AI-marked spoken practice, and its post-operative chest pain scenario is scored on precisely that: ECG first, aspirin with the surgeon's agreement, Wells, the leak considered, and the medical registrar called early.

Post-operative Chest Pain: ACS, PE and the Surgical Differential