A 62-Year-Old Man with Breathlessness, a Normal ECG and a Rising Troponin

This is a non-ST-elevation acute coronary syndrome (NSTE-ACS) until proven otherwise. ST depression in V4-V6 with ongoing ischaemic symptoms and a raised hs-troponin satisfies the criteria for NSTEMI, but a single value of 28 ng/L (2x URL) cannot establish the kinetics - a single point is compatible with acute myocardial injury, chronic injury (diabetes, CKD) or an acute coronary event.

Key reasoning steps:

• Do not dismiss as chronic: the clinical context (typical ischaemic symptoms, dynamic ECG changes, diabetes, hypertension) makes type 1 MI the working diagnosis.
• Repeat troponin at 1-3 hours to demonstrate a rise/fall. A flat value with a normal ECG would push toward chronic myocardial injury; a rising value with dynamic ST change confirms acute MI.
• Risk score: apply GRACE (age, HR, SBP, creatinine, Killip class, ST deviation, troponin) and/or TIMI. This patient has multiple adverse features: ST deviation, positive troponin, diabetes, CKD, and symptom onset within 90 minutes.
• ECG caveats: absence of posterior leads means a posterior STEMI cannot be excluded; if there is any suggestion of posterior extension (reciprocal changes, dominant R in V1-V2), record V7-V9.
• Do not give fibrinolysis: thrombolysis is contraindicated in NSTE-ACS and carries harm without benefit.

Immediate management (first 60 minutes):

• Aspirin 300 mg loading (chewed) plus a P2Y12 inhibitor - prefer ticagrelor 180 mg or prasugrel only if PCI is planned and no contraindication; clopidogrel 300-600 mg is an alternative, especially if bleeding risk or fibrinolysis is contemplated.
• Anticoagulation: fondaparinux 2.5 mg SC or enoxaparin; avoid if eGFR <30 or if invasive strategy is imminent (use UFH instead).
• Anti-ischaemic therapy: sublingual GTN, beta-blocker if no contraindication, high-intensity statin.
• Oxygen only if SpO2 <90%; routine oxygen in normoxic patients is harmful.
• Analgesia with cautious opioids only if pain is refractory (opioids blunt P2Y12 absorption).

Disposition reasoning:

• This patient is high risk (GRACE likely >140, dynamic ECG, diabetes, CKD). Current guidance favours an early invasive strategy within 24 hours for high-risk NSTE-ACS, and immediately (<2 hours) if haemodynamically unstable or with refractory ischaemia.
• He is currently pain-free and haemodynamically stable, so an immediate ambulance transfer is reasonable but not mandatory at 03:00; the decision should be made by the receiving cardiology team. Discuss with the PCI centre now - the transfer should not be delayed until 08:00 simply because the local cardiologist is off-site.
• If he develops recurrent pain, ST elevation, hypotension, ventricular arrhythmia or heart failure, transfer becomes an emergency.
• Do not give fibrinolysis for this NSTE-ACS; it is not indicated and may cause harm.
• Document a clear plan for the intervening hours: continuous ECG monitoring, repeat troponin and ECG, and a named clinician responsible for escalation.

A troponin rise from 28 to 890 ng/L with anterior akinesis on echo confirms a large anterior myocardial infarction, likely a proximal LAD occlusion, and identifies reduced LVEF (40%) - a major adverse prognostic marker.

Implications:

• Urgency escalates: this is now a high-risk NSTEMI with a large jeopardised territory and LV dysfunction. The invasive strategy should be expedited (ideally within 24 hours, and immediately if ischaemia recurs).
• Heart failure therapy: start an ACE inhibitor/ARB (or ARNI if appropriate), a beta-blocker once stable, and consider an MRA if EF remains ≤40% and there is no renal contraindication (K+ and eGFR must be checked).
• Antithrombotic duration: DAPT for 12 months is standard after ACS; if there is high bleeding risk, consider shorter DAPT with early de-escalation.
• Device assessment: reassess LVEF at 6-12 weeks; if EF remains ≤35% despite optimal medical therapy, consider an ICD for primary prevention.
• Secondary prevention: high-intensity statin, smoking cessation, diabetes optimisation (SGLT2 inhibitor or GLP-1 RA with proven cardiovascular benefit), cardiac rehabilitation referral.
• Anticoagulation: if AF or LV thrombus is found, anticoagulation is required; echo should specifically look for apical thrombus in anterior MI.