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Hypersensitivity Pneumonitis and Bronchial Asthma Attacks Caused Allergology International. 2008;57:277-280 ! DOI: 10.2332 allergolint. C-07-56 CASE REPORT Hypersensitivity Pneumonitis and Bronchial Asthma Attacks Caused by Environmental Fungi Nobuyuki Katayama1, Masaki Fujimura1, Masahide Yasui1, Haruhiko Ogawa1 and Shinji Nakao1 ABSTRACT We report a case of hypersensitivity pneumonitis and asthma attacks caused by environmental fungi in a 75- year-old man. The diagnosis was established by inhalation challenge with Bjerkandera adusta and Aspergillus fumigatus. The patient was admitted for treatment of fever, wheezing, and dyspnea. Chest computed tomogra- phy showed small nodular shadows with diffuse, partially patchy, ground-glass opacities. The findings of bron- choalveolar lavage fluid were compatible with hypersensitivity pneumonitis. His symptoms and objective find- ings, including chest radiographs, worsened after returning home, suggesting the existence of causative anti- gens in his house. B. adusta and A. fumigatus were isolated from the living room and bedroom. Based on the results of antigen inhalation bronchoprovocation test, he was given a diagnosis of hypersensitivity pneumonitis caused by B. adusta and bronchial asthma attacks caused by B. adusta and A. fumigatus. After cleaning the entire house, the patient has had no recurrence of the symptoms on returning home. KEY WORDS Bjerkandera adusta, bronchial asthma, home environment provocation test, hypersensitivity pneumonitis, inha- lation challenge test sity Hospital on 29 March 2006 because of dyspnea, INTRODUCTION productive cough, fever, and wheezing. He had previ- Hypersensitivity pneumonia (HP) is an interstitial ously received outpatient treatment for bronchial lung disease characterized by an abnormal immu- asthma, sinobronchial syndrome, and yellow nail syn- nologic reaction to specific antigens contained in a drome. He had been hospitalized six times since the wide variety of organic dust. Summer-type hypersen- age of 50 for the treatment of pneumonia. In January sitivity pneumonia (SHP) is one of the most common 2004, he had been admitted because of fever and types of HP in Japan.1 Most cases of SHP in Japan are dyspnea. Chronic eosinophilic pneumonia was diag- caused by inhalation of Trichosporon cutaneum, a fun- nosed on bronchoalveolar lavage fluid (BALF) and gus that grows copiously in the house during the hu- other findings. Corticosteroid therapy was started mid summer after the rainy season.2 Other types of and tapered off gradually until September 2005. The fungi, for example Penicillium3 and Fusarium,4 also patient had no history of smoking or dust exposure. have been reported as causes of HP. Bronchial He lived in a 30-year-old wooden house. No pets were asthma is an allergic disease, and inhalation of fungal kept in his house. antigens causes asthma attacks in some patients. We Physical examination revealed the following find- report here a case of HP and asthma attacks caused ings: temperature 38.6℃, blood pressure 90!58 by an environmental fungus, Bjerkandera adusta, mmHg, and pulse rate 84 beats!min. Findings on car- which was diagnosed by antigen inhalation challenge. diac examination were entirely within normal limits. Respiratory rate was 26 times!min. Auscultation of CLINICAL SUMMARY the lungs revealed holo-inspiratory and expiratory A 75-year-old man was admitted to Kanazawa Univer- rhonchi in all lung fields. 1Respiratory Medicine, Kanazawa University Hospital, Ishikawa, Email: [email protected]−u.ac.jp Japan. Received 4 September 2007. Accepted for publication 10 Decem- Correspondence: Nobuyuki Katayama, Respiratory Medicine, Ka- ber 2007. nazawa University Hospital, 13−1 Takara-machi, Kanazawa, !2008 Japanese Society of Allergology Ishikawa 920−8641, Japan. Allergology International Vol 57, No3, 2008 www.jsaweb.jp! 277 Katayama N et al. Fig. 1 Chest radiograph on admission showing small nod- Fig. 2 Chest computed tomography scan on admission ules, linear shadows, and band-shaped shadows with an in- showing small nodular shadows with diffuse, partially crease in lung density predominantly in both lower fields. patchy, ground-glass opacities. The white blood cell count was 22,700 cells!μL analysis of BALF, taken after the home provocation with a differential of 73.0% neutrophils, 16.0% lympho- test, revealed 22.5% alveolar macrophages, 64.0% lym- cytes, 9.0% monocytes, and 1.0% eosinophils. The phocytes, 11.5% neutrophils, 2.0% eosinophils, and an erythrocyte sedimentation rate was 77 mm!h. The C- increased total cell count of 3.3 × 105. These findings reactive protein level was 1.1 mg!dL. Arterial blood strongly suggested the diagnosis of HP. gas analysis showed pH 7.494, PaCO2 35.4 torr, and Sterile Petri dishes containing Sabouraud’s agar PaO2 51.2 torr. The total IgE, KL-6, SP-D, and other medium supplemented with antibiotics were exposed laboratory findings were normal or negative. Cultures for 10 minutes on the floor of every room of the pa- for microorganisms from the patient’s sputum grew tient’s house with the windows closed, and Aspergil- normal flora. The chest radiograph on admission lus fumigatus and B. adusta were isolated from the showed small nodules, linear shadows, and band- dishes exposed in the living room and bedroom. shaped shadows with an increase in lung density pre- Skin tests for fungal antigens were done by intrad- dominantly in both lower fields (Fig. 1). The chest ermal injection with 0.02 ml of the solutions (1 mg! computed tomography scan showed small nodular ml). The immediate-type and late-type skin test reac- shadows with diffuse, partially patchy, ground-glass tions for A. fumigatus and B. adusta were negative. opacities (Fig. 2). The specific IgE for Aspergillus was positive. Because of concerns that the patient might have Bronchoprovocation test using 2 ml of the fungal atypical pneumonia, for example, Legionella pneumo- antigen solutions (1 mg!ml) was performed after the nia, concurrent with an asthma attack, we began the patient gave informed consent. We confirmed that en- treatment with antibiotics (quinolone) and bronchodi- dotoxin was not contained in the antigen. The control lators. The patient’s symptoms and objective findings solution did not induce any abnormal findings. How- improved smoothly and he was discharged on 7 April. ever, A. fumigatus antigen inhalation caused wheez- However, 3 days later, on 10 April, he was readmitted ing and decrease in FEV1, whereas it was judged to for recurrence of cough, wheezing, and dyspnea. The be negative for provocation of HP. B. adusta antigen objective findings this time were very similar to those inhalation revealed wheezing, decreased FEV1, dete- from the last admission. He promptly improved fol- rioration of SpO2 to 93%, 1℃ increase in body tem- lowing treatment with 20 mg!day prednisolone for perature, and increased numbers of white blood cells the asthma attack. We now suspected that the patient in the peripheral blood (Table1). We judged that B. must be suffering from HP, and a home environment adusta was the antigen causing both asthma and HP. provocation test was done on 21 April. Approximately Based on these results, the patient thoroughly 20 hours after he returned home, his illness was re- cleaned the entire house, and he has not experienced produced. This time his symptoms and laboratory further exacerbations since the cleaning. and radiological findings improved following hospi- talization, only, without medication. Differential cell 278 Allergology International Vol 57, No3, 2008 www.jsaweb.jp! Fungus Related Allergic Lung Diseases Table 1 Clinical and laboratory findings of the antigen inhalation challenge test using antigen extract solutions of Aspergillus fumigatus and Bjerkandera adusta Clinical and laboratory Antigen Before 10 min Bronchodilator 1 h 6 h 24 h findings Aspergillus Body temperature (℃) 36.2 36.3 36.2 36.5 36.1 35.8 fumigatus Symptoms ― Dyspnea ― ― ― ― Auscultation of the lungs Normal Wheezes Normal Normal Normal Normal WBC (/μL) 7700 7700 CRP (mg/dL) 0.1 0.2 FVC (L) 3.12 3.02 3.10 3.10 3.08 3.10 FEV1 (L) 1.52 1.26 1.43 1.43 1.43 1.44 SpO2 (%) 97 97 97 97 97 97 Bjerkandera Body temperature (℃) 35.9 36.6 36.5 36.4 36.9 35.7 adusta Symptoms ― Dyspnea ― ― ― ― Auscultation of the lungs Normal Wheezes Normal Normal Normal Normal WBC (/μL) 8600 9300 CRP (mg/dL) 0.1 0.1 FVC (L) 2.98 2.90 3.00 3.08 3.10 3.06 FEV1 (L) 1.43 1.11 1.43 1.53 1.58 1.44 SpO2 (%) 97 97 96 93 95 97 and was successfully treated by reducing the expo- DISCUSSION sure. On the other hand, it was proved by the bron- Fungi are among the most important antigens for HP. choprovocation test that B. adusta and A. fumigatus For example, T. cutaneum is the principal antigen were antigens inducing asthma attacks in this patient. linked to summer-type HP, one of the most prevalent In considering the patient’s history and these find- types of HP in Japan.1 Many other fungi have also ings, we suspect that eosinophilic pneumonia, diag- been reported as causative antigens for HP. Some of nosed in 2004, may have been related to inhalation of these are encountered through occupational expo- these environmental fungi. Cases of eosinophilic sure5 and others through environmental expo- pneumonia caused by fungal antigens have also been sure.1,3,4,6,7 Generally, it is very difficult to detect the reported.10,11 This case emphasizes the importance of antigen, especially in the case of environmental expo- an environmental survey and antigen inhalation bron- sure. In some patients, bronchial asthma also is choprovocation testing to detect causative antigens in caused by inhalation of fungal antigens, and some allergic lung diseases. cases of asthma are linked with a particular fungus, as in allergic bronchopulmonary aspergillosis. ACKNOWLEDGEMENTS Fungi comprise more than 72,000 species. Some of We thank National Sagamihara Hospital for providing them are known pathogens, but large numbers of the B.
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