Well, we know that BS tends to elevate in response to stress along with BP, HR, RR, etc. However, for the CVA and cardiac arrest algorithm, BS checks are listed specifically over and over again. BS checks are not listed with any of the other ACLS disorders in my book, but you would expect the BS to go up during symptomatic tachycardia and other disorders if the event was scary to the patient, but BS checks is not listed in any of those other conditions in the ACLS Manual. This leads me to believe that the need for BS checks with CVA would be directly related to the actual location of the infarct. This is also why you would check a CVA patient's temperature because if the hypothalamus were damaged, you would see alterations in thermoregulation.
That makes sense, had never thought about the possible impending acidosis, which would lead to a fatal arrhythmia and additional damage whether it were cardiac arrest or CVA. If the BS were not regulated, this could cause additional infarct. DM patients are known to be at risk for CVA and CVD, which go hand in hand. Furthermore, when the BS is high this damages micro arteries, which would also lead to further ischemia and alterations in hemodynamic status.