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Avoidance therapy in reactive dye—induced occupational asthma: long-term follow-up

 Jung-Won Park  ;  Joo-Young Yang  ;  Cheol-Woo Kim  ;  Kyu-Sang Kim  ;  Chein-Soo Hong 
 ANNALS OF ALLERGY ASTHMA & IMMUNOLOGY, Vol.97(4) : 551-556, 2006 
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Asthma/chemically induced* ; Asthma/diagnosis ; Asthma/prevention & control* ; Coloring Agents/adverse effects* ; Follow-Up Studies ; Humans ; Immunoglobulin E/blood ; Korea ; Methacholine Chloride ; Occupational Diseases/chemically induced* ; Occupational Diseases/diagnosis ; Occupational Diseases/prevention & control* ; Prognosis ; Risk Reduction Behavior* ; Treatment Outcome
BACKGROUND: Previous studies reported that early diagnosis and avoidance therapy are the most important factors for prevention of permanent lung impairment; however, few studies have evaluated the long-term prognosis of reactive dye-induced occupational asthma (RD-OA). OBJECTIVE: To evaluate the long-term outcomes of RD-OA. METHODS: Methacholine airway hyperresponsiveness (AHR) and lung functions were evaluated and compared in 26 patients with RD-OA at the time of diagnosis and after complete avoidance of the causative agents. Patients with continued (n = 13) or remitted (n = 6) AHR were further monitored for up to a mean +/- SD of 8.7 +/- 1.8 years. RESULTS: The AHR resolved in 10 (38%) of 26 patients a mean +/- SD of 2.2 +/- 1.3 years after complete avoidance of RDs; however, prebronchodilator forced expiratory volume in 1 second (FEV1) values were not different. Levels of IgE specific to the RD-human serum albumin complex were markedly decreased at first follow-up in 5 RD-atopic patients from whom paired serum samples were compared (P = .02). The AHR disappeared in an additional 5 patients and improved in 4 by the second follow-up. The FEV1 values also improved compared with diagnosis and first follow-up levels. Favorable prognosis was associated with early diagnosis of RD-OA and complete avoidance of the causative agent. No association was found with smoking history, latent periods, the presence of RD specific IgE, baseline provocation concentration that caused a decrease in FEV1 of 20%, or FEV1. CONCLUSIONS: Early diagnosis and avoidance therapy are the most important prognostic factors in RD-OA. The AHR and lung function of patients with RD-OA can sometimes be recovered steadily and slowly through avoidance measures.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Park, Jung Won(박중원) ORCID logo https://orcid.org/0000-0003-0249-8749
Yang, Joo Young(양주영)
Hong, Chein Soo(홍천수)
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