Acute Non-cardiac pathology
| Pulmonary embolism | ST elevation lead III | Sinus Tachycardia or AF RBBB Right heart strain pattern S1Q3T3 |
Review major risks for PE |
| Raised ICP (any cause) | Can be similar to STEMI or ischaemia Widespread, deep T wave inversions (‘cerebral T waves’) |
Predominantly neurological complaints and signs | |
| Hypothermia | Positive J point (negative in right-ward leads) in precordial leads [Osborn Waves] | Various bradyarrhythmias | Temperature < 32 degrees |
| Hypercalcaemia | See Hypothermia | QT shortening | Severe hypercalcaemia |
| Sodium channel blocker toxicity | See Bundle Branch Block | Right axis deviation of the terminal QRS | History of overdose |
| Hypokalaemia | Widespread ST depression | T wave flattening U waves |
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| Hyperkalaemia | See Bundle Branch Block | Widespread Peaked T waves P / PR widening |
K+ > 7mmol/K |