An ECG must be done to confirm an arrhythmia, but that is usually not possible before someone dies of sudden death without warning signs. Thus, arrhythmias are usually a diagnosis of exclusion. There are certain cardiac abnormalities that are associated with an arrhythmia, but many people who have arrhythmias have structurally normal hearts. Thus, if you have further questions, I suggest that you contact the medical examiner involved in the autopsy. I hope this information is useful.
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