Clinical features

• Tachyarrhythmias — including ventricular tachycardia and fibrillation.

• Asystole — more likely with high current (>10A).

• Myocardial injury—heat injury, coronary artery spasm, arrhythmias, myocardial spasm.

• Respiratory arrest — tetanic contraction of the diaphragm, arrhythmias, cerebral medullary dysfunction.

• Trauma — tetanic muscle contraction, falling or being thrown clear.

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