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Am. J. Respir. Crit. Care Med., Volume 158, Number 1, July 1998, 311-314

Increased Carbon Monoxide in Exhaled Air of Subjects with Upper Respiratory Tract Infections

MUTSUO YAMAYA, KIYOHISA SEKIZAWA, SATOSHI ISHIZUKA, MIZUE MONMA, KATSUMI MIZUTA, and HIDETADA SASAKI

Department of Geriatric Medicine, Tohoku University School of Medicine, and Virus Center, Clinical Research Division, Sendai National Hospital, Sendai, Japan

Viral infection may induce the expression of heme oxygenase, resulting in increased carbon monoxide (CO) formation. CO may be produced by various cells of the upper and lower respiratory tract and may be detected in the exhaled air. Therefore, exhaled CO concentrations were measured on a CO monitor by vital capacity maneuver in subjects with upper respiratory tract infections (URTIs) and in nonsmoking and smoking healthy control subjects. At the time of symptoms of URTI, exhaled CO concentrations were 5.6 ± 0.4 ppm and decreased to 1.0 ± 0.1 ppm during recovery. Recovery values of exhaled CO were similar to those in age-matched nonsmoking healthy control subjects (1.2 ± 0.3 ppm). Smoking healthy control subjects had the highest levels of exhaled CO concentration among the groups (18.5 ± 2.5 ppm). These findings suggest that symptomatic URTIs increase the concentration of CO in exhaled air. This may reflect the induction of heme oxygenase that has an antiviral effect in the airways.




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