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Association between exposure to environmental tobacco smoke and exacerbations of asthma in children.
N Engl J Med. 1993 Jun 10; 328(23):1665-9.NEJM

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.

Authors+Show Affiliations

Foundation for Blood Research, Scarborough, ME 04070-0190.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

8487825

Citation

Chilmonczyk, B A., et al. "Association Between Exposure to Environmental Tobacco Smoke and Exacerbations of Asthma in Children." The New England Journal of Medicine, vol. 328, no. 23, 1993, pp. 1665-9.
Chilmonczyk BA, Salmun LM, Megathlin KN, et al. Association between exposure to environmental tobacco smoke and exacerbations of asthma in children. N Engl J Med. 1993;328(23):1665-9.
Chilmonczyk, B. A., Salmun, L. M., Megathlin, K. N., Neveux, L. M., Palomaki, G. E., Knight, G. J., Pulkkinen, A. J., & Haddow, J. E. (1993). Association between exposure to environmental tobacco smoke and exacerbations of asthma in children. The New England Journal of Medicine, 328(23), 1665-9.
Chilmonczyk BA, et al. Association Between Exposure to Environmental Tobacco Smoke and Exacerbations of Asthma in Children. N Engl J Med. 1993 Jun 10;328(23):1665-9. PubMed PMID: 8487825.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Association between exposure to environmental tobacco smoke and exacerbations of asthma in children. AU - Chilmonczyk,B A, AU - Salmun,L M, AU - Megathlin,K N, AU - Neveux,L M, AU - Palomaki,G E, AU - Knight,G J, AU - Pulkkinen,A J, AU - Haddow,J E, PY - 1993/6/10/pubmed PY - 1993/6/10/medline PY - 1993/6/10/entrez SP - 1665 EP - 9 JF - The New England journal of medicine JO - N. Engl. J. Med. VL - 328 IS - 23 N2 - 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. SN - 0028-4793 UR - https://www.unboundmedicine.com/medline/citation/8487825/Association_between_exposure_to_environmental_tobacco_smoke_and_exacerbations_of_asthma_in_children_ L2 - http://www.nejm.org/doi/full/10.1056/NEJM199306103282303?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -