Dehydration. Does it contribute to a senior's fall risk?

The dehydration is probably not the primary cause of the fall. They probably were in poor physical condition, having lost most of their muscle mass (it starts as early as our 30's). My mom is gone as of this summer, but she resisted drinking water--because it made her pee! And she wore Depends, and these were expensive, so to her, the solution was to not have so much "input" so as to reduce the "output".

Underlying respiratory issues, like an infection coming on, can cause seniors to fall. Also side effects of medications. Was there a change in medication or has this person been on a medication for while? The ER doctor would've seen right away on the labs if this person is dehydrated - did this doctor actually tell you that this person is dehydrated? It sounds like this person had plenty of fluids. Take a copy of the labs to the person's primary care doctor because there's something else going on.