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Updated: Jun 10, 2026
Bronchial Thermoplasty: A Novel Therapeutic Approach to Severe Asthma
Published on: November 4, 2010
Association between asthma control and health-related quality of life in severe asthma: a cross-sectional study from
Noeul Kang1, Seung-Eun Lee2, Hyun Lee3
1Division of Allergy, Department of Medicine, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Republic of Korea.
Background:
Severe asthma (SA) imposes a significant burden on patients' health-related quality of life (HRQoL). This study aimed to quantify HRQoL burden and identify clinical determinants associated with HRQoL impairment in patients with SA.
Methods:
Cross-sectional data were collected from 701 patients (592 with SA, 109 with non-severe asthma (NSA)) in the Korean Severe Asthma Registry (KoSAR). HRQoL was measured using the EuroQoL 5-dimension 5-level (EQ-5D-5L) and Severe Asthma Questionnaire (SAQ). Asthma control status was assessed with the Asthma Control Test (ACT) scores. Multivariable and ordinal logistic regression analyses were conducted to identify factors associated with HRQoL.
Results:
Patients with SA had lower EQ-5D-5L scores than those with NSA (SA: 0.83 versus NSA: 0.87, p<0.001). Among patients with SA, recent rescue medication use, reduced lung function and uncontrolled symptoms were associated with impaired HRQoL. Uncontrolled SA was associated with greater impairments than controlled SA (uncontrolled: 0.75 versus controlled: 0.85, p<0.001). Uncontrolled SA was associated with higher odds of worse health states across all five domains, with greatest impairments in the usual activities domain. The EQ-5D-5L scores decreased in proportion to the level of asthma control. ACT scores strongly correlated with both EQ-5D-5L (r=0.608, p<0.001) and SAQ (r=0.680, p<0.001). Amongst ACT items, "daily functioning" was the strongest determinant of HRQoL.
Conclusion:
Uncontrolled asthma, particularly its impact on daily functioning, was associated with HRQoL impairment in patients with SA. Enhancing asthma control may significantly reduce the disease burden and improve HRQoL in SA.
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