Is this fair game to photograph?

You are in a hospital, and you see the possibility of a candid image, using a patient (who is not a family member nor anyone you know) in the hospital, one who is suffering from such a large degree of dementia that she does not know where she is.

Is this fair game to take a shot?  How about posting it on the internet then?

An example found in this thread: http://forums.dpreview.com/forums/thread/3364075

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