Which watch version/software for my Mom?

in Apple Watch
My Mom is getting older and wants an iWatch for if she falls and for it's ability to detect unusual heart rhythms.

From what I understand you don't have to get the newest iWatch to get the sensors and software that can do this for her.

Of course, I'd like to do this as inexpensively as possible.  What's the oldest version of the iWatch that will still do all the medical functions the newest iWatch can do?



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