Meyer Kattan1, Leonard B Bacharier2, George T O'Connor3, Robyn Cohen3, Ronald L Sorkness4, Wayne Morgan5, Peter J Gergen6, Katy F Jaffee7, Cynthia M Visness7, Robert A Wood8, Gordon R Bloomberg2, Susan Doyle4, Ryan Burton4, James E Gern4. 1. Department of Pediatrics, Columbia University College of Physicians and Surgeons, New York, NY. Electronic address: mk2833@cumc.columbia.edu. 2. Department of Pediatrics, Washington University School of Medicine, St. Louis, Mo. 3. Department of Medicine, Boston University School of Medicine, Boston, Mass. 4. Pharmacy Practice Division, University of Wisconsin School of Medicine and Public Health, Madison, Wis. 5. Department of Pediatrics, University of Arizona College of Medicine, Tucson, Ariz. 6. Division of Allergy, Immunology, and Transplantation, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Bethesda, Md. 7. Federal Systems Division, Rho Inc., Chapel Hill, NC. 8. Department of Pediatric Immunology, Johns Hopkins University School of Medicine, Baltimore, Md.
Abstract
BACKGROUND: Comparisons of the technical acceptability of spirometry and impulse oscillometry (IOS) and clinical correlations of the measurements have not been well studied in young children. There are no large studies focused on African American and Hispanic children. OBJECTIVES: We sought to (1) compare the acceptability of spirometry and IOS in 3- to 5-year-old children and (2) examine the relationship of maternal smoking during pregnancy to later lung function. METHODS: Spirometry and IOS were attempted at 4 sites from the Urban Environmental and Childhood Asthma Study birth cohort at ages 3, 4, and 5 years (472, 471, and 479 children, respectively). We measured forced expiratory flow in 0.5 s (forced expiratory volume in 0.5 seconds [FEV0.5]) with spirometry and area of reactance (AX), resistance and reactance at 5 Hz (R5 and X5, respectively) using IOS. RESULTS: Children were more likely to achieve acceptable maneuvers with spirometry than with IOS at age 3 (60% vs 46%, P < .001) and 5 years (89% vs 84%, P = .02). Performance was consistent among the 4 study sites. In children without recurrent wheeze, there were strong trends for higher FEV0.5 and lower R5 and AX over time. Maternal smoking during pregnancy was associated with higher AX at ages 4 and 5 years (P < .01 for both years). There was no significant difference in FEV0.5 between children with and without in utero exposure to smoking. CONCLUSION: There is a higher rate of acceptable maneuvers with spirometry compared with IOS, but IOS may be a better indicator of peripheral airway function in preschool children.
BACKGROUND: Comparisons of the technical acceptability of spirometry and impulse oscillometry (IOS) and clinical correlations of the measurements have not been well studied in young children. There are no large studies focused on African American and Hispanic children. OBJECTIVES: We sought to (1) compare the acceptability of spirometry and IOS in 3- to 5-year-old children and (2) examine the relationship of maternal smoking during pregnancy to later lung function. METHODS: Spirometry and IOS were attempted at 4 sites from the Urban Environmental and Childhood Asthma Study birth cohort at ages 3, 4, and 5 years (472, 471, and 479 children, respectively). We measured forced expiratory flow in 0.5 s (forced expiratory volume in 0.5 seconds [FEV0.5]) with spirometry and area of reactance (AX), resistance and reactance at 5 Hz (R5 and X5, respectively) using IOS. RESULTS:Children were more likely to achieve acceptable maneuvers with spirometry than with IOS at age 3 (60% vs 46%, P < .001) and 5 years (89% vs 84%, P = .02). Performance was consistent among the 4 study sites. In children without recurrent wheeze, there were strong trends for higher FEV0.5 and lower R5 and AX over time. Maternal smoking during pregnancy was associated with higher AX at ages 4 and 5 years (P < .01 for both years). There was no significant difference in FEV0.5 between children with and without in utero exposure to smoking. CONCLUSION: There is a higher rate of acceptable maneuvers with spirometry compared with IOS, but IOS may be a better indicator of peripheral airway function in preschool children.
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