Could Atenolol Prevent Body From Experiencing Shocks?

I am taking atenolol for hypertension. I recently gave plasma, and was severely dehydrated to begin with, as it turns out, which I found out when I was taken to the emergency room. My question is can atenolol prevent my body from experiencing shock, such as my body experienced about an hour or so after giving the plasma? In other words, had my body experienced "regular" (for lack of another way of putting it) shock, it seems likely that I would have experienced that while still at the plasma center. Am I correct? Thanks,Kent