Latex Allergy

Sort out which reaction you are actually dealing with - Irritant contact dermatitis is erythema from friction or chemicals, is not immunologic, and those patients do not need latex avoidance at all. Allergic contact dermatitis is type IV: erythema plus pruritus and urticaria, delayed, and switching to non-latex products may not resolve it. True type I latex allergy brings urticaria, angioedema, asthma, and anaphylaxis. Only the last one is an intraoperative emergency, and only the history separates them.

Know who carries the risk - Spina bifida, where latex hypersensitivity prevalence runs 20% to 65%; children with urologic anomalies and repeated catheterization; healthcare workers, dentists, and lab staff with heavy glove exposure; and anyone with multiple surgeries in childhood. The history is the screening test — there is nothing better available.

The latex-fruit connection - Ask specifically about avocado, banana, chestnut, kiwi, celery, and pear; mango and passionfruit have also been reported. Cross-reactivity runs both directions, so those food allergies raise the odds of latex hypersensitivity and vice versa.

What testing can and cannot give you - Serum IgE assays are the common test worldwide but produce significant false positives. Skin prick testing is the gold standard for type I latex hypersensitivity, but it is not available in the United States because there is no approved natural rubber latex reagent. A negative serum test in a high-risk history does not clear the patient.

OR presentation is not the textbook rash - Patients in the operating room typically show rash and bronchospasm, but the most common presentation is cardiovascular collapse. Latex anaphylaxis also tends to run delayed, often more than 30 to 60 minutes after exposure, so a crash well into the case is still latex until proven otherwise.

Prevention is the entire management strategy - There is no cure and no desensitization for latex sensitization. Neoprene, polyvinyl chloride, silicone, and vinyl are the alternatives, and powder-free, latex-free gloves have measurably cut the incidence.

Hunt the hidden latex yourself - Gloves are the obvious one; Foley catheter balloons and Swan-Ganz catheter balloons are the classic misses. Walk the room and your own cart rather than trusting the sign on the door, and flag the case to the whole team and to central supply before the patient arrives.

Cornstarch makes it an airborne problem - Glove cornstarch carries the latex protein into the air, so exposure is not limited to what touches the patient. The room's recent glove history matters as much as the tray you opened.

Premedication does not work - There is no data supporting steroid and histamine-blocker pretreatment to prevent reactions in latex-sensitive patients. Do not let a pretreatment order stand in for a genuinely latex-free environment.

Treat it like any other anaphylaxis - Remove every latex product from the patient immediately, protect the airway, give epinephrine early, and resuscitate with fluid. Latex anaphylaxis is managed no differently from anaphylaxis to any other agent — the only latex-specific step is getting the source off and out of the patient.

Latex allergy is hypersensitivity to proteins in natural rubber latex, the sap of the rubber tree Hevea brasiliensis. Hundreds of allergens have been identified, fifteen of them formally numbered Hev b1 through Hev b15. The natural rubber proteins produce both asymptomatic sensitization and true type I, IgE-mediated hypersensitivity: IgE bound to mast cells and basophils triggers release of histamine, leukotrienes, prostaglandins, and kinins within minutes of exposure. Chemical antioxidants added during processing drive a separate type IV delayed reaction — contact dermatitis, not anaphylaxis.

Routes of entry are direct skin contact, mucous membranes, intravenous, and inhalation of glove cornstarch carrying the protein. Latex allergy affects 1% to 2% of the population and is the second most common cause of intraoperative anaphylaxis, behind muscle relaxants — which is what moves it from a dermatology problem to yours.