I imagine if these deaths could have been prevented by this one-line HN comment, they would have thought of it.
Maybe a better phrasing of your question would be:
> Why is hemodialysis ineffective for this?
Hacker News Guidelines > "Be kind. Don't be snarky. Converse curiously; don't cross-examine. Edit out swipes."
The main reason for my question was this:
https://news.ycombinator.com/item?id=44609583