title: The patient with underlying disease must be excluded or analyzed separately.
authors.affiliation: Emergency Medicine Department, Shahid Dr. Rahnemoon Hospital, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Electronic address: hajimaghsoudi@tums.ac.ir.
authors.forename: Majid
authors.initials: M
authors.lastname: Hajimaghsoudi
authors.affiliation: Emergency Medicine Department, Shahid Dr. Rahnemoon Hospital, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Electronic address: fmodjallal@yahoo.com.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Mojallal Najjar
mesh_terms: D019296:Capnography; D004636:Emergency Service, Hospital; D005260:Female; D006801:Humans; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*