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Relating small airways to asthma control by using impulse oscillometry in children.
J Allergy Clin Immunol 2012; 129(3):671-8JA

Abstract

BACKGROUND

Previous reports suggest that the peripheral airways are associated with asthma control. Patient history, although subjective, is used largely to assess asthma control in children because spirometric results are many times normal values. Impulse oscillometry (IOS) is an objective and noninvasive measurement of lung function that has the potential to examine independently both small- and large-airway obstruction.

OBJECTIVE

We sought to determine the utility of IOS in assessing asthma control in children.

METHODS

Asthmatic and healthy children (6-17 years) were enrolled in the study. Spirometric and IOS (resistance of the respiratory system at 5 Hz [R5] and 20 Hz [R20], reactance of the respiratory system at 5 Hz [X5], resonant frequency of reactance [Fres], and area under the reactance curve between 5 Hz and Fres [reactance area {AX}]) values were collected in triplicate before and after a bronchodilator was administered. The physicians were blinded to the IOS measurements and assessed asthma control using American Thoracic Society guidelines.

RESULTS

Small-airway IOS measurements, including the difference of R5 and R20 [R5-20], X5, Fres, and AX, of children with uncontrolled asthma (n = 44) were significantly different from those of children with controlled asthma (n = 57) and healthy children (n = 14), especially before the administration of a bronchodilator. However, there was no difference in large-airway IOS values (R20). No differences were found between children with controlled asthma and healthy children in any of the end points. Receiver operating characteristic analysis showed cut points for baseline R5-20 (1.5 cm H(2)O · L(-1) · s) and AX (9.5 cm H(2)O · L(-1)) that effectively discriminated controlled versus uncontrolled asthma (area under the curve, 0.86 and 0.84) and correctly classified more than 80% of the population.

CONCLUSION

Uncontrolled asthma is associated with small-airways dysfunction, and IOS might be a reliable and noninvasive method to assess asthma control in children.

Authors+Show Affiliations

Department of Biomedical Engineering, University of California, Irvine, CA 92697-2730, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22178635

Citation

Shi, Yixin, et al. "Relating Small Airways to Asthma Control By Using Impulse Oscillometry in Children." The Journal of Allergy and Clinical Immunology, vol. 129, no. 3, 2012, pp. 671-8.
Shi Y, Aledia AS, Tatavoosian AV, et al. Relating small airways to asthma control by using impulse oscillometry in children. J Allergy Clin Immunol. 2012;129(3):671-8.
Shi, Y., Aledia, A. S., Tatavoosian, A. V., Vijayalakshmi, S., Galant, S. P., & George, S. C. (2012). Relating small airways to asthma control by using impulse oscillometry in children. The Journal of Allergy and Clinical Immunology, 129(3), pp. 671-8. doi:10.1016/j.jaci.2011.11.002.
Shi Y, et al. Relating Small Airways to Asthma Control By Using Impulse Oscillometry in Children. J Allergy Clin Immunol. 2012;129(3):671-8. PubMed PMID: 22178635.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relating small airways to asthma control by using impulse oscillometry in children. AU - Shi,Yixin, AU - Aledia,Anna S, AU - Tatavoosian,Ahramahzd V, AU - Vijayalakshmi,Shruthi, AU - Galant,Stanley P, AU - George,Steven C, Y1 - 2011/12/17/ PY - 2011/09/17/received PY - 2011/11/02/revised PY - 2011/11/07/accepted PY - 2011/12/20/entrez PY - 2011/12/20/pubmed PY - 2012/7/7/medline SP - 671 EP - 8 JF - The Journal of allergy and clinical immunology JO - J. Allergy Clin. Immunol. VL - 129 IS - 3 N2 - BACKGROUND: Previous reports suggest that the peripheral airways are associated with asthma control. Patient history, although subjective, is used largely to assess asthma control in children because spirometric results are many times normal values. Impulse oscillometry (IOS) is an objective and noninvasive measurement of lung function that has the potential to examine independently both small- and large-airway obstruction. OBJECTIVE: We sought to determine the utility of IOS in assessing asthma control in children. METHODS: Asthmatic and healthy children (6-17 years) were enrolled in the study. Spirometric and IOS (resistance of the respiratory system at 5 Hz [R5] and 20 Hz [R20], reactance of the respiratory system at 5 Hz [X5], resonant frequency of reactance [Fres], and area under the reactance curve between 5 Hz and Fres [reactance area {AX}]) values were collected in triplicate before and after a bronchodilator was administered. The physicians were blinded to the IOS measurements and assessed asthma control using American Thoracic Society guidelines. RESULTS: Small-airway IOS measurements, including the difference of R5 and R20 [R5-20], X5, Fres, and AX, of children with uncontrolled asthma (n = 44) were significantly different from those of children with controlled asthma (n = 57) and healthy children (n = 14), especially before the administration of a bronchodilator. However, there was no difference in large-airway IOS values (R20). No differences were found between children with controlled asthma and healthy children in any of the end points. Receiver operating characteristic analysis showed cut points for baseline R5-20 (1.5 cm H(2)O · L(-1) · s) and AX (9.5 cm H(2)O · L(-1)) that effectively discriminated controlled versus uncontrolled asthma (area under the curve, 0.86 and 0.84) and correctly classified more than 80% of the population. CONCLUSION: Uncontrolled asthma is associated with small-airways dysfunction, and IOS might be a reliable and noninvasive method to assess asthma control in children. SN - 1097-6825 UR - https://www.unboundmedicine.com/medline/citation/22178635/Relating_small_airways_to_asthma_control_by_using_impulse_oscillometry_in_children_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0091-6749(11)01743-X DB - PRIME DP - Unbound Medicine ER -