Hemorrhagic rhinitis. An immunologic disease due to hexahydrophthalic anhydride.

This is a descriptive study of six men who had been occupationally exposed to heated epoxy resin containing hexahydrophthalic anhydride (HHPA) who presented with rhinitis, nasal mucosal erosions, and significant epistaxis; three also had asthma. When they were removed from exposure to HHPA, the rhinitis symptoms, nasal erosions, and epistaxis resolved spontaneous. All six had high titers of IgG and IgE against HHP-HSA as determined by an enzyme-linked immunosorbent assay (ELISA). Other asymptomatic workers with similar HHPA exposure had ver low or negative titers of IgG and IgE against HHP-HSA. We conclude that these results are very suggestive of an immunologic mechanism being responsible for the rhinitis, nasal mucosal erosions, and epistaxis that occurred in the six described HHPA workers.