한빛사 논문
Ji-Hyang Lee MD1, Jin An MD1, Ha-Kyeong Won MD2, Yewon Kang MD3, Hyouk-Soo Kwon MD, PhD1, Tae-Bum Kim MD, PhD1, You Sook Cho MD, PhD1, Hee-Bom Moon MD, PhD1, Woo-Jung Song MD, PhD1,*James H. Hull FRCP, PhD4,*
1 Department of Allergy and Clinical Immunology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
2 Department of Internal Medicine, Veterans Health Service Medical Center, Seoul, Korea
3 Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
4 National Heart & Lung Institute, Imperial College London & Royal Brompton and Harefield NHS Foundation Trust, London, UK
*Co-Correspondence to: Woo-Jung Song, MD, PhD. Department of Allergy and Clinical Immunology, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea.
*Co-Correspondence to: James H. Hull, FRCP, PhD. National Heart & Lung Institute, Imperial College London & Royal Brompton and Harefield NHS Foundation Trust, London, SW3 6HP, UK.
Abstract
Background
Laryngeal or vocal cord dysfunction has long been regarded as a mimic of asthma; however recent evidence indicates that it may be a significant comorbid condition in asthmatics.
Objective
We aimed to systematically estimate the prevalence of comorbid laryngeal dysfunction (LD) in asthmatic adults and to characterize its clinical impact on asthma.
Methods
Electronic databases were searched for relevant studies published until June 2019. Studies were included if LD was objectively defined by direct visualization of laryngeal movement. Outcomes included the prevalence of LD and its association with clinical asthma indicators, such as severity, control and quality of life. Random effects meta-analyses were performed to calculate the estimates.
Results
A total of 21 studies involving 1,637 patients were identified. Overall, the pooled prevalence of LD in asthmatic adults was 25% (95% CI: 15-37%; I2=96%). Prevalence estimates differed according to the diagnostic test utilized with lowest overall prevalence (4%; 95% CI: 0-10%; I2=90%) seen when LD was diagnosed by resting laryngoscopy without external stimuli; however, it was much higher in laryngoscopy studies utilizing external trigger, such as exercise (38%, 95% CI: 24-53; I2=90%) or in those using a CT-based diagnostic protocol (36%; 95% CI: 24-49; I2=78%). Only seven studies reported the associations between LD and clinical asthma indicators; inconsistencies between studies limited meaningful conclusions.
Conclusion
LD may be a common comorbidity in asthma, affecting about 25% of adult patients. Further prospective studies are needed to better characterize its clinical impact and benefits of detecting and managing LD in asthmatic patients.
Key words
laryngeal dysfunction; vocal cord dysfunction; inducible laryngeal obstruction; asthma; treatable traits; prevalence; systematic review
Abbreviations
LD, laryngeal dysfunction; VCD, vocal cord dysfunction; ILO, inducible laryngeal obstruction; CT, computed tomography; 95% CI, 95% confidence interval
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