ABSTRACT

This is a retrospective chart-review study. Patients data files were enrolled on two bases, (1) they were exposed to carbon monoxide (CO) for more than 24 h (i.e., chronic), and (2) they were adult, that is, 18 years of age and above. The cohort was subdivided into those patients who were active smokers (18) and those who were not smokers (43). Diagnostic questionnaires on file had been completed by the patients, some completing two or even three questionnaires over the course of their evaluation. In all instances, the most recently completed questionnaire (i.e., longest time period since CO exposure) was chosen for use. The questionnaires used were dated from 2001 to 2006.