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Original Article
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Volume 328:1665-1669 June 10, 1993 Number 23
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Association between Exposure to Environmental Tobacco Smoke and Exacerbations of Asthma in Children
Barbara A. Chilmonczyk, Luis M. Salmun, Keith N. Megathlin, Louis M. Neveux, Glenn E. Palomaki, George J. Knight, Andrea J. Pulkkinen, and James E. Haddow

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ABSTRACT

Background Exposure to environmental tobacco smoke, as reported by parents, has been linked to diminished pulmonary function and more frequent exacerbations of asthma in children with the disease. Further insight into this association might be gained by using urine cotinine levels to measure actual exposure.

Methods We measured urine cotinine levels in 199 children with asthma; 145 also underwent pulmonary-function studies. A parent answered questions about each child's exposure to environmental tobacco smoke. Acute exacerbations of asthma during the preceding year were documented through blinded review of medical records. Possible confounding factors were accounted for by the use of multivariate analysis and by comparisons of serum theophylline levels in exposed and unexposed children.

Results The median urine cotinine levels were 5.6 ng per milliliter in the 116 children reported not to have been exposed to tobacco smoke, 13.1 ng per milliliter in the 53 children exposed to cigarette smoking by the mother or other persons, and 55.8 ng per milliliter in the 30 children exposed to cigarette smoking by the mother and other persons. Acute exacerbations of asthma increased with exposure, whether such exposure was reported by a parent or identified on the basis of the cotinine level; the relative risks for the highest as compared with the lowest exposure category were 1.8 (95 percent confidence interval, 1.4 to 2.2) for reported exposure and 1.7 (95 percent confidence interval, 1.4 to 2.1) for exposure indicated by cotinine levels. The forced expiratory volume in one second (FEV1), the forced expiratory flow between 25 and 75 percent of vital capacity, and the ratio of FEV1 to forced vital capacity also decreased with increases in both measures of exposure.

Conclusions Measurement of urine cotinine levels provides further evidence of an association between exposure to environmental tobacco smoke and pulmonary morbidity in children with asthma. These data emphasize the need for systematic, persistent efforts to stop the exposure of children with asthma to environmental tobacco smoke.


Source Information

From the Foundation for Blood Research, Scarborough, Me. (B.A.C., L.M.N., G.E.P., G.J.K., A.J.P., J.E.H.); and the Maine Medical Center, Portland (B.A.C., L.M.S., K.N.M.).

Address reprint requests to Dr. Haddow at the Foundation for Blood Research, P.O. Box 190, Scarborough, ME 04070-0190.

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Related Letters:

The Hazards of Active and Passive Smoking
Richardson R.S., Coggins C., Haddow J. E., Palomaki G. E., Chilmonczyk B. A., Boyle P.
Extract | Full Text  
N Engl J Med 1993; 329:1580-1581, Nov 18, 1993. Correspondence

Cockroach Allergen and Asthma
Schulaner F. A., Jaén C. R., Rosenstreich D. L., The Environmental Subcommittee of the National Cooperative Inner-City Asthma Study
Extract | Full Text  
N Engl J Med 1997; 337:791-792, Sep 11, 1997. Correspondence

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