Exactly. I was looking up the same info. They can not tell if an electrical disturbance caused the death because they were not measuring it when the event purportedly happened. I would wager she had a normal cardiac pathology. And, given her age, it would be very un-likely that she had an irregular heartbeat and didn’t know about it. And her brother said she did not.
“And, given her age, it would be very un-likely that she had an irregular heartbeat and didn’t know about it. And her brother said she did not.”
I’m sure that is the case with a chronic condition, if she was having even semi-regular checkups. I’m not sure whether or not there might be physical signs to look for that could suggest some sudden arrythmia, that wouldn’t have caused any symptoms prior to the incident.
A person can have heart failure for quite some time and not know it due to compensation like a faster heart rate. The stress of a plane crash can raise the heart rate even higher which can lead to ventricular fibrillation and death.
If the ME finds an enlarged heart and can rule out other causes then the ruling is probably going to be sudden cardiac death.