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Increased carbon monoxide in exhaled air of patients with seasonal allergic rhinitis
Author(s) -
Mizue Monma,
Mutsuo Yamaya,
Kiyohisa Sekizawa,
Katsuhisa Ikeda,
Naohiro Suzuki,
Toshiaki Kikuchi,
Tomonori Takasaka,
Hidetada Sasaki
Publication year - 1999
Publication title -
clinical and experimental allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 154
eISSN - 1365-2222
pISSN - 0954-7894
DOI - 10.1046/j.1365-2222.1999.00684.x
Subject(s) - exhalation , exhaled air , medicine , exhaled breath condensate , gastroenterology , carbon monoxide , allergy , asthma , immunology , anesthesia , chemistry , toxicology , biology , biochemistry , catalysis
Background Carbon monoxide (CO) can be detected in exhaled air and is increased in asthmatic patients. However, it is uncertain whether exhaled CO is increased in patients with allergic rhinitis. Objective and methods To study whether exhaled CO is increased in patients with allergic rhinitis, exhaled CO concentrations were measured on a CO monitor by vital capacity manoeuvre in 86 patients with seasonal allergic rhinitis during and out of the cedar pollen season. Results During the season, exhaled CO concentrations were 3.6 ± 0.3 p.p.m. and decreased to 1.2 ± 0.1 p.p.m. out of the season. The values of exhaled CO out of the season were similar to those in age‐matched non‐smoking healthy control subjects (1.2 ± 0.1 p.p.m.). Exhaled CO concentrations were significantly higher in patients with symptoms than in those without symptoms ( P < 0.01). Exhaled CO concentrations in patients did not differ significantly among oral and nasal exhalation, and oral exhalation with an expiratory resistance ( P > 0.20). Conclusion These findings suggest that allergic rhinitis increases the concentration of CO in exhaled air and increases in exhaled CO may be derived from lower airways.