What dose of aspirin is given in suspected acute coronary syndrome?

A single loading dose of 300 mg, as soon as possible, unless there is clear evidence that the person is allergic to it. NICE CG95 makes this recommendation for suspected acute coronary syndrome, and NICE NG185 repeats it for both STEMI and NSTEMI.

How soon should a NSTEMI go to coronary angiography?

Immediately if the clinical condition is unstable. Otherwise NICE NG185 says to consider angiography with follow-on PCI within 72 hours of first admission for people at intermediate or higher risk, meaning a predicted 6-month mortality above 3.0% on a score such as GRACE.

Should you give oxygen in acute coronary syndrome?

Not routinely. NICE CG95 says to monitor oxygen saturation and offer supplemental oxygen only to people with saturations below 94% who are not at risk of hypercapnic respiratory failure, aiming for 94% to 98%. For people with COPD at risk of hypercapnic failure, the target is 88% to 92% until blood gas analysis is available.

What else raises a troponin?

NICE CG95 asks you to reassess for other causes when a raised troponin is found in suspected acute coronary syndrome, naming myocarditis, aortic dissection and pulmonary embolism. Renal impairment and sepsis also commonly raise it, which is why the rise or fall over time matters more than a single value.

What are the four secondary prevention drugs after a myocardial infarction?

NICE NG185 recommends an ACE inhibitor, dual antiplatelet therapy with aspirin plus a second antiplatelet, a beta-blocker and a statin. Dual antiplatelet therapy is continued for up to 12 months unless contraindicated, and clopidogrel replaces the second antiplatelet if the person needs ongoing oral anticoagulation.

Acute Coronary Syndrome — IMT Interview Clinical Station Answer

Q: When is primary PCI preferred over fibrinolysis in STEMI?

NICE NG185 recommends coronary angiography with follow-on primary PCI when presentation is within 12 hours of symptom onset and primary PCI can be delivered within 120 minutes of the time when fibrinolysis could have been given. If that cannot be achieved, fibrinolysis is offered instead, within the same 12-hour presentation window.

Acute coronary syndrome at the IMT (Internal Medicine Training) clinical station is answered in three moves: get a 12-lead ECG in minutes, split STEMI from NSTEMI on that ECG, and then say the reperfusion rule out loud. NICE NG185 recommends primary PCI when the patient presents within 12 hours of symptom onset and PCI can be delivered within 120 minutes of the time when fibrinolysis could have been given.

Key takeaways

NICE CG95 recommends a resting 12-lead ECG and a high-sensitivity troponin on arrival in hospital, and states plainly that a normal ECG does not exclude acute coronary syndrome.
NICE CG95 recommends a single loading dose of 300 mg aspirin as soon as possible in suspected acute coronary syndrome, with pain relief by glyceryl trinitrate or intravenous morphine.
Oxygen is not routine in acute coronary syndrome: NICE CG95 restricts it to saturations below 94%, targeting 94% to 98%, or 88% to 92% in people with COPD at risk of hypercapnic respiratory failure.
For STEMI, NICE NG185 sets two numbers: presentation within 12 hours of symptom onset, and primary PCI deliverable within 120 minutes of when fibrinolysis could have been given.
For NSTEMI and unstable angina, NICE NG185 asks for a formal 6-month mortality score such as GRACE, with angiography within 72 hours when predicted 6-month mortality is above 3.0%.
Immediate coronary angiography is for the patient with unstable angina or NSTEMI whose clinical condition is unstable, not for everybody with a raised troponin.

How do you recognise acute coronary syndrome in the scenario?

Acute coronary syndrome is recognised from the pattern, not from one feature: ischaemic chest pain lasting more than about 15 minutes, with sweating, nausea, breathlessness or pain radiating to the jaw or arm.

Say early that presentation can be atypical. Older patients, women and people with diabetes may present with breathlessness, collapse or confusion rather than pain, and the station is often written that way.

According to NICE CG95, you should not rule out acute coronary syndrome on a normal resting 12-lead ECG. That single sentence rescues the candidate whose scenario hands them a normal trace.

What does the A to E assessment and the first hour look like?

The first hour of acute coronary syndrome is an A to E assessment run alongside a 12-lead ECG taken as soon as possible, aspirin, analgesia and continuous monitoring. Say you would do them together rather than in sequence.

Airway and breathing: usually intact, but pulmonary oedema or cardiac arrest changes the answer immediately
Circulation: intravenous access, blood pressure in both arms if dissection is possible, and a 12-lead ECG within minutes of arrival, repeated if the pain continues
Aspirin: a single loading dose of 300 mg as soon as possible, unless there is clear evidence of allergy, as NICE CG95 recommends
Analgesia: glyceryl trinitrate sublingually or buccally, with intravenous morphine if myocardial infarction is suspected
Oxygen: not routine. NICE CG95 restricts it to saturations below 94%, targeting 94% to 98%, and 88% to 92% in COPD with a risk of hypercapnic respiratory failure
Monitoring: pulse, blood pressure, rhythm, saturations and repeated 12-lead ECGs until the diagnosis is firm

In practice the discriminating sentence is that the ECG is a first-hour task, not an investigation you order. Candidates who list it among bloods have already lost the timing mark.

Which investigations confirm acute coronary syndrome?

The two investigations that make the diagnosis of acute coronary syndrome are the resting 12-lead ECG and a high-sensitivity troponin, both recommended by NICE CG95 on arrival in hospital.

NICE CG95 says to use the universal definition of myocardial infarction: a rise or fall of troponin with at least one value above the 99th percentile of the upper reference limit, plus a feature of ischaemia.

Take the length of time since the suspected event into account when interpreting the troponin, and follow the NICE diagnostics guidance on high-sensitivity testing for the rule-out protocol
Reassess for other causes of a raised troponin before settling on acute coronary syndrome: NICE CG95 names myocarditis, aortic dissection and pulmonary embolism
Send full blood count, urea and electrolytes, glucose, lipids and clotting, and request a chest X-ray to look for alternatives such as pneumonia or a widened mediastinum
Echocardiography assesses left ventricular function, which NICE NG185 asks for in everyone after a STEMI or NSTEMI before discharge

What is the reperfusion rule you have to say out loud?

The threshold that decides STEMI management is two numbers held together. NICE NG185 recommends primary PCI when presentation is within 12 hours of symptom onset and primary PCI can be delivered within 120 minutes of the time when fibrinolysis could have been given.

If that 120-minute window cannot be met, NICE NG185 recommends fibrinolysis for a patient presenting within 12 hours of symptom onset, with an antithrombin given at the same time.

After fibrinolysis, NICE NG185 asks for an ECG 60 to 90 minutes later; residual ST elevation means immediate coronary angiography, and it says explicitly not to repeat the fibrinolytic
Cardiogenic shock with STEMI within 12 hours of symptom onset is an offer of angiography with follow-on primary PCI, not a reason to hold back
Beyond 12 hours, consider angiography if there is evidence of continuing myocardial ischaemia, or if the patient has or develops cardiogenic shock
Radial access is preferred to femoral for coronary angiography, and a drug-eluting stent is offered if stenting is indicated

What is the definitive management of NSTEMI and unstable angina?

For NSTEMI and unstable angina, NICE NG185 recommends aspirin 300 mg as soon as possible, fondaparinux unless the patient has a high bleeding risk or is going straight for angiography, and a formal risk score before any invasive decision.

That score predicts 6-month mortality, and GRACE is the example NICE NG185 gives. The number it produces is what selects the pathway, so quote the cut-off rather than the adjective.

Immediate coronary angiography if the clinical condition is unstable
Consider angiography with follow-on PCI within 72 hours of first admission for intermediate or higher risk, meaning predicted 6-month mortality above 3.0%
Consider conservative management without early angiography at low risk, meaning predicted 6-month mortality of 3.0% or less, with angiography if ischaemia later appears
NICE NG185 says not to offer dual antiplatelet therapy to people with chest pain before a diagnosis of unstable angina or NSTEMI is made
Manage hyperglycaemia after acute coronary syndrome by keeping blood glucose below 11.0 mmol/litre while avoiding hypoglycaemia, considering a dose-adjusted insulin infusion

Finish the acute coronary syndrome answer with secondary prevention, because NICE NG185 lists four drugs after myocardial infarction: an ACE inhibitor, dual antiplatelet therapy, a beta-blocker and a statin, with cardiac rehabilitation offered alongside.

When and to whom do you escalate acute coronary syndrome?

Escalate acute coronary syndrome the moment the ECG shows ST elevation, because the referral to the primary PCI centre is the treatment. Do not wait for a troponin to come back.

Call the medical registrar and the on-call cardiologist together, and involve critical care early for cardiogenic shock, sustained ventricular arrhythmia or pulmonary oedema that is not responding.

That said, the scenario often turns on frailty or an existing treatment escalation plan. Say that you would find the ReSPECT form, discuss with the responsible consultant, and involve the patient or those close to them.

How do you hand over acute coronary syndrome in one minute?

The acute coronary syndrome handover uses SBAR with the ECG finding and the clock in the first two sentences, because the receiving cardiologist is making a reperfusion decision from what you say.

Situation: a 62 year old with 90 minutes of central chest pain and 3 mm of ST elevation in the inferior leads. Background: smoker, hypertensive, no anticoagulant, no bleeding history.

Assessment: inferior STEMI, pain-free after glyceryl trinitrate and morphine, blood pressure 110 over 70, no murmur, saturations 97% on air. Recommendation: aspirin 300 mg given, please accept for primary PCI now, and confirm the transfer time.

What does the panel listen for in an acute coronary syndrome answer?

The panel listens for the ECG as a first-hour action, aspirin 300 mg as a number, the 12-hour and 120-minute pair, and a named 6-month mortality score for NSTEMI.

In practice they also mark whether you say oxygen is not routine, because it is the single most common reflex error in an acute coronary syndrome answer. The internalmedicineinterview bank of 361 questions across 56 scenarios, with AI-marked spoken practice, exists to make those sentences automatic under time pressure.

What are the common mistakes in an acute coronary syndrome station?

Putting oxygen on every patient with chest pain rather than titrating to the target range
Waiting for the troponin before calling about an ST elevation ECG
Giving dual antiplatelet therapy before the diagnosis of unstable angina or NSTEMI is made
Saying 'a low GRACE score' rather than predicted 6-month mortality of 3.0% or less
Excluding acute coronary syndrome on a single normal ECG, or on a single normal troponin taken too early
Finishing at reperfusion and never mentioning secondary prevention, left ventricular assessment or cardiac rehabilitation

How this comes up at the IMT interview

Acute coronary syndrome maps onto every part of the IMT clinical station. Investigations and diagnosis is the ECG and the high-sensitivity troponin; management is aspirin, analgesia and the reperfusion rule; and communication is explaining to a frightened patient why they are being moved to another hospital now.

The handover minute is where the ECG finding, the time since onset and the request for primary PCI have to be said in order, which is why acute coronary syndrome rewards rehearsal more than reading.

Acute Coronary Syndrome: The ECG, the Troponin and the Reperfusion Clock