Here's an article from TSN by Bob McKenzie:
http://www.tsn.ca/hockey-community-praying-for-craig-cunningham-1.613515
I don't follow many players accounts on Twitter - mainly Bruins and former Bruins. I've noticed a TON of player tweets, even from accounts that may tweet 3-4 times a year...that tells me he's made a LOT of close friends. Shows what kind of guy he is. I hope he pulls through whatever it is as best he can.
For the record, "critical but stable" is NOT a medical term. It's not even a term that hospitals are supposed to use when discussing the condition of a patient with the media - the generally approved terms include "good", "fair", "serious", and "critical". Those terms are deliberately vague for privacy reasons.
Not knowing anything specifically in this case, to me, "critical but stable" would make me guess he's in an ICU/CCU type unit where you're on tight monitoring, since that's where critical care nurses and critical care doctors are. But it tells me absolutely nothing about why he's there, or even how serious his condition is in the long run. If that's true, it also tells me that they're not ready to move him out onto a less invasive floor at this point.