[Hypersensitivity reactions to food additives].

Food additives are ingredients that are intentionally added to food in order to modify its physical, chemical, biological, or sensorial characteristics. Food additives may act as allergens and generate IgE-mediated immune reactions, or they may act as pseudo allergens and generate non-IgE-mediated immune reactions. Such reactions can generate diverse clinical pictures or they may exacerbate diseases as diverse as eosinophilic esophagitis, bronchial asthma, atopic dermatitis, contact dermatitis, chronic urticaria, or anaphylaxis.

[Perioperative allergy. A 3-year experience].

Background: Perioperative hypersensitivity reactions constitute a global health problem, with an estimated incidence of 1 per 100,000 procedures and a mortality rate of 0.1 to 9 %. Main risk factors are a history of allergy to other drugs, atopy, associated psychiatric disorders and previous surgeries.

[Non-allergic rhinitis with eosinophilic syndrome. Case report].

Background: Rhinitis is the leading cause for consultation in the allergy department. It consists in chronic inflammation of the nasal mucosa. Non-allergic rhinitis with eosinophilic syndrome is characterized by chronic inflammation of the nasal mucosa (> 20% of eosinophils in nasal cytology) in the absence of demonstrable allergy (negative in vivo and in vitro tests); often it is accompanied by other sinonasal conditions (nasal polyposis, chronic rhinosinusitis), and it constitutes a risk factor for the development of obstructive sleep apnea.

Tolerance Induction to Antituberculosis Drugs in a Patient With Stevens-Johnson Syndrome/Toxic Epidermal Necrolysis Overlap.

Tolerance induction and desensitization in Stevens-Johnson syndrome (SJS) or in toxic epidermal necrolysis (TEN) have been described as an absolute contraindication by some authors, but there are cases where there is no treatment alternative. Tuberculosis (TB) remains a leading cause of morbidity and mortality in developing countries and ranks alongside HIV as a leading cause of death worldwide. Severe drug reactions, such as SJS and TEN, occurring in these individuals are lifethreatening.

[Latex sensitization and allergy in Hospital General de Mexico surgery residents].

Background: The prevalence of latex allergy ranges from 0.8 to 6.5% and is the second cause of perioperative anaphylaxis.

[Plantago psyllium-secondary anaphylaxis. Case report].

Background: Psyllium is a derivative of Plantago ovata ground seed and husk that is used as bulk-forming laxatives owing to its hydrocolloid properties.

Case Report: 43-year-old female nurse with previous diagnosis of drug allergy and allergic rhinitis who, after the preparation and administration of a laxative, developed rhinoconjunctivitis symptoms, urticarial syndrome, angioedema and bronchospasm, which led to conclude that she had an anaphylactic reaction. She was treated with adrenaline, corticosteroids and antihistamines.