The allergic reaction occurred during the medical procedure according to the quote which means it was likely an unknown allergy to anesthesia that hadn't been caught before, likely because he had never had a medical procedure requiring it. That or it was antibiotics he was allergic to that he didn't know he was allergic to where the reaction wasn't caught fast enough due to the presence of anesthesia. As well, blood thinners could have been at fault. Quite a bit more medication than people think of can go into a medical procedure, and generally if there is an allergy to one, the others don't make it much better. Regardless, deaths from this allergy only affect about 3% to 6% of people according to Wikipedia, so although it is somewhat rare, it does happen.
RIP Monty
eriol33 - If your peanut allergy is mild, odds are that it won't just spike to deadly by pure magic one day. People die from severe allergic reactions everyday, but that's why people with severe documented allergic reactions carry around an epipen or two just in case. If you don't need to carry around an epipen, you're still fine treating your peanut allergy the same as you always have.
RIP Monty
eriol33 - If your peanut allergy is mild, odds are that it won't just spike to deadly by pure magic one day. People die from severe allergic reactions everyday, but that's why people with severe documented allergic reactions carry around an epipen or two just in case. If you don't need to carry around an epipen, you're still fine treating your peanut allergy the same as you always have.
