Chest Pain in a Remote Mining Town

Immediate management:

1. Recognise STEMI: ST elevation in II, III, aVF indicates inferior STEMI. Need to assess for right ventricular involvement (V4R) and posterior extension (V1-V3 reciprocal changes).
2. Antiplatelet and anticoagulant therapy:
   • Aspirin 300 mg chewed (if not already).
   • Clopidogrel 300 mg loading (or ticagrelor if available, but not listed).
   • Heparin: weight-based IV bolus (e.g., 60 IU/kg up to 4000 IU) if fibrinolysis is planned, or as per PCI protocol.
3. Analgesia and supportive care:
   • Morphine 2.5-5 mg IV titrated for pain.
   • GTN sublingual or IV if pain persists and no contraindication (avoid if right ventricular infarction, hypotension, or recent phosphodiesterase inhibitor use).
   • Oxygen only if SpO2 <90% (target 94-98%).
4. Reperfusion decision:
   • Primary PCI is the preferred reperfusion strategy if it can be delivered within 120 minutes of first medical contact. Here, air transport is 4 hours to PCI centre, plus ground transfer and activation time, so PCI will be >120 minutes. Therefore, fibrinolysis should be considered if no contraindications.
   • However, fibrinolysis is most effective within 2 hours of symptom onset; this patient presents at 2 hours, so benefit is substantial. But check for contraindications: recent surgery, stroke, bleeding risk, etc. Not mentioned, so likely eligible.
   • If fibrinolysis is given, initiate immediately and arrange urgent transfer to PCI centre for rescue or routine early angiography.
   • If fibrinolysis is contraindicated, transfer for PCI even if delay >120 minutes.
5. Transport logistics:
   • Air ambulance available only in daylight; sunset at 6 pm. It is 3 pm now, so there is a 3-hour window. Need to activate air ambulance immediately. If fibrinolysis is given, patient can be stabilised and transferred. If not, transfer ASAP.
   • Consider road transport if air not available? Road is 3 hours to hospital with CT but no PCI; PCI centre is 4 hours by air. Road to PCI would be much longer. So air is essential.
6. Monitoring: Continuous ECG, vital signs, and watch for arrhythmias (especially heart block in inferior MI). Have atropine and pacing ready. Avoid nitrates if RV infarction.
7. Disposition: Admit to clinic's emergency bay, start treatment, and arrange transfer. Document times and communicate with receiving PCI centre.

Justification: The key is timely reperfusion. With PCI delay >120 min, fibrinolysis is indicated if no contraindications. The daylight constraint adds urgency to air transport. Risk stratification includes TIMI score but not essential for immediate decision.

If fibrinolysis is contraindicated:

• Antiplatelet and anticoagulant therapy: Continue aspirin and clopidogrel. Use heparin (e.g., enoxaparin 1 mg/kg SC or IV unfractionated heparin) to reduce thrombus propagation, but balance bleeding risk.
• GTN: Use for pain and hypertension if no contraindication (avoid in RV infarction, hypotension). Titrate to pain and BP.
• Monitoring: Continuous ECG for arrhythmias (heart block, VT/VF). Inferior MI often involves right coronary artery; monitor for bradycardia and hypotension. Keep atropine at bedside. Assess for signs of heart failure (crackles, JVP).
• Transport: Arrange immediate air transfer to PCI centre. Even if delay >120 min, PCI is still beneficial. Optimise for transfer: stabilise BP, pain, and rhythm.
• Consider other diagnoses: Aortic dissection? Not typical, but if suspicion, avoid heparin. Pulmonary embolism? Unlikely with ST elevation.
• Communication: Discuss with cardiologist at PCI centre for advice and to prepare for arrival.
• Documentation: Record times, contraindications, and treatment given.