10 High-Risk ECG Patterns Requiring Urgent Intervention 1. Wellens – LAD critical stenosis 2. Brugada – VF risk 3. Hyperkalemia – Sine-wave evolution 4. Massive PE – S1Q3T3, RBBB 5. STEMI – Contiguous ST↑ 6. LM/prox LAD – ST↑aVR, diffuse ST↓ 7. VT – Treat as VT unless proven otherwise 8. TdP – Polymorphic VT long QT 9. 3° HB – AV dissociation, escape rhythm 10. Tamponade – Low voltage ± alternans Each pattern correlates with a time-sensitive clinical pathway. 📈 Review the diagnostic criteria ab