As GeaorgiaAnes indicated, it depends on the actual clinical situation.
If this was on my initial gas prior to coming off bypass, I'd treat. If I was transfusing a patient, and expected to continue to transfuse, I'd treat. If this was a regular gas checked on a patient on during a relatively routine case, and there are no hemodynamic derangements, probably not.
Most likely not. However, if I'm giving a bunch of insulin, and the trend is worsening hypokalemia, then yes. If the patient is starting to have hemodynamically significant arrhythmias, yes.
Bis of 65 with mild emg activity
I almost never use the BIS. But, if my end-tidal gas is adequate, I can see EMG activity/have twitches, or I recently gave ketamine, I would not do anything. If I'm doing a TIVA with muscle relaxation, and for some reason decided to put a BIS on, I might give more vec (if no EMG activity was part of my plan), and only increase the propofol rate if the BIS remains persistently elevated, vitals indicate that the patient may be getting light, and I have no other explanation for the elevated BIS (I usually give ketamine in my TIVAs, so have noticed the BIS run a little higher).
Most likely not, unless the trend is showing that the glucose is steadily increasing, or special situations like being on bypass or pts with head trauma.
Paroxysmal a fib intra op, give amiodarone?
If no effect on BP, no. If some mild effect, rapid, or I have a particular reason to want to avoid a-fib (aortic stenosis), then I'd rate control, and possibly try to convert (electrically, in the case of AS).
If this was a depressed EF coming off bypass, then probably. Otherwise, plenty of people walk around with EF 40% at baseline, I'm not starting epi just because they're now in front of me having their knee scoped.
Post cpb platelet count 80, INR 2.1
If not clinically bleeding, then no. I'd reverse the heparin, and give various products based on the clinical bleeding, and what diagnostic tools are available. If this was a particularly long pump run, pt with AS, and some other test shows decreased platelet function, then yes.
See the EF 40% answer.