I have come across a situation where patients and doctors and nurses
say adrenaline allergy exists so adrenaline must never be given. On detailed
questioning this seems to occur at the dentist where local anaesthetic is
injected with adrenaline to prolong the effect of anaesthesia.
The problem is if there is an anaphylactic (severe reaction) then the first
remedy is too inject adrenaline to combat the reaction. So what can or should
In evolutionary terms any animal that collapsed due to any sudden shock would
quickly become extinct because it could not run or fight. Mammals and perhaps
other animals have adrenal glands to deal with "fright" by reacting
with "fight or flight".
In human terms, any time you suddenly have to jump out of the way of danger or
even have an unpleasant nightmare would bring on collapse - leading
automatically to more adrenaline release leading to hugely elevated blood
pressure leading to still more stress and further adrenaline release and
inevitable stroke or cardiac arrest. i.e. an uncontrolled positive feedback