<P> There are three main classifications of anaphylaxis . Anaphylactic shock is associated with systemic vasodilation that causes low blood pressure which is by definition 30 % lower than the person 's baseline or below standard values . Biphasic anaphylaxis is the recurrence of symptoms within 1 -- 72 hours with no further exposure to the allergen . Reports of incidence vary , with some studies claiming as many as 20 % of cases . The recurrence typically occurs within 8 hours . It is managed in the same manner as anaphylaxis . Pseudoanaphylaxis or anaphylactoid reactions are a type of anaphylaxis that does not involve an allergic reaction but is due to direct mast cell degranulation . Non-immune anaphylaxis is the current term used by the World Allergy Organization with some recommending that the old terminology no longer be used . </P>
<P> There are three main classifications of anaphylaxis . Anaphylactic shock is associated with systemic vasodilation that causes low blood pressure which is by definition 30 % lower than the person 's baseline or below standard values . Biphasic anaphylaxis is the recurrence of symptoms within 1 -- 72 hours with no further exposure to the allergen . Reports of incidence vary , with some studies claiming as many as 20 % of cases . The recurrence typically occurs within 8 hours . It is managed in the same manner as anaphylaxis . Pseudoanaphylaxis or anaphylactoid reactions are a type of anaphylaxis that does not involve an allergic reaction but is due to direct mast cell degranulation . Non-immune anaphylaxis is the current term used by the World Allergy Organization with some recommending that the old terminology no longer be used . </P>
what happens to blood pressure in anaphylactic shock
what happens to blood pressure in anaphylactic shock
causes low blood pressure
causes low blood pressure