[Anaphylactic shock in anesthesia].

The notion of anaphylactic shock under anaesthesia implies sensitization, with a minimum delay of 1 week, on the occasion either of a previous anaesthesia with the responsible product, or with taking a drug with common antigenic determinants. Clinically this is reflected by the rapid and explosive appearance of symptoms which are always comparable: tendency to vascular collapse, respiratory bronchospastic distress, erythematous rash and Quincke's edema, gastrointestinal disorders, etc. These signs and symptoms of anaphylactic shock are closely related to the pharmacological actions of substances liberated during the reaction, of reaginic orgin (histamine, S.R.S.A.). It is reproduced by the direct effects of numerous anaesthetics on the liberation of theses very substances without the intermediary of an immunological mechanism. In consequence, the clinical argument alone is not sufficient to assert the true anaphylactic nature of a shock. Consequently, the elements of the history must be strongly borne in mind: notion ofsensitization during a previous anaesthesia, to the responsible product or to a drug which could have a crossed antigenicity with it.