Asymptomatic patients with normal ECG on presentation after a low-voltage<unk>  injury
All patients with high-voltage<unk>  (even if asymptomatic)
Patients with low-voltage injury if symptomatic (e.g. LOC, severe burns, ECG changes, ↑ CK)
Abnormal ECG or observed dysrhythmia
Cardiac biomarkers positive
Persistent chest pain, paresthesias, or hypoxia
Cardiac arrest
History of significant cardiac disease or CAD risk factors
Electrical injuries
Smoke inhalation injury 
Cold injuries
Chemical injury
Trauma 
Acrolein
Lightning injuries
Hydrochloric acid