How can a medical examiner determine that the cause of death was a cardiac arrhythmia?

How can a medical examiner determine that the cause of death was a cardiac arrhythmia?
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Answer :

The only way to physically find a heart arrhythmia is while someone is alive and their heart is beating, you can map the electric pathways along the nerves. Once they are dead there are no electric signals in the heart, there is nothing to detect. So you cannot physically prove beyond doubt that there was a heart arrhythmia, it is a diagnosis of deduction/elimination after someone is dead.
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