Anaphylactic shock caused by formaldehyde in a patient undergoing long-term hemodialysis.

Formaldehyde (F) elicits contact dermatitis and asthma in subjects who are exposed to this chemical when it is applied on the skin or inhaled. An immediate-type hypersensitivity reaction was never confirmed in these reactions. F is widely used in hemodialysis to sterilize adhesives, surgical devices, or reconditioned dialyzers. A 20-year-old woman who was subjected to hemodialysis for the past 4 years had a contact dermatitis to F. When hemodialysis was performed with a new dialyzer not sterilized with F, there were no symptoms. She had minor symptoms of anaphylaxis characterized by rhinitis, wheezing, and headache on the first use of a reconditioned dialyzer. Two days later, she was dialyzed with the same reconditioned dialyzer and developed within minutes a severe anaphylactic shock requiring resuscitation. The patient had no personal or family history of atopy. Prick tests and RAST to common food and inhlant allergens were negative. Prick tests performed with 0.1% and 1% F were positive in the patient, whereas they were negative in control subjects. RAST to F was performed with discs specially prepared and coated with human serum albumin. RAST was strongly positive. RAST to ethylene oxide was negative. A patch test with F was performed and induced an anaphylactic shock 26 hours after the skin application of F. The patient did not present any anaphylactic symptoms with the use of nonreconditioned dialyzers. An immediate-type allergy to F mediated by IgE may be envisaged in this patient.