Relationship between Current Psychological Symptoms and Future Risk of Asthma Outcomes: A 12-Month Prospective Cohort Study

Abstract

Background. Subjects with asthma are more susceptible to psychological symptoms, but it is uncertain whether psychological symptoms are linked to future risk of asthma outcomes. Objective. To investigate the relationship between current psychological symptoms and future risk of asthma outcomes. Methods. We conducted a prospective cohort study with a 12-month follow-up period of 297 patients with asthma. Psychological symptoms, lung function, asthma control test, and Asthma Quality of Life Questionnaire at baseline were assessed. Asthma outcomes including exacerbations, unplanned visits, emergency visits, hospital admissions, intensive care unit admissions, and length of hospital stays were monitored monthly. The time to the first asthma outcomes was analyzed. Furthermore, the association between psychological symptoms and future risk of asthma outcomes was calculated as adjusted relative risk (RR) using logistic regression models. Results. The asthma patients were assigned to one of three groups: neither anxiety nor depression symptoms (NAD, n = 102), either anxiety or depression symptoms (A/D, n = 68), or anxiety and depression symptoms (AD, n = 120). Logistic regression models indicated that asthma patients in the AD group, but not the A/D group, had an increased adjusted RR for unplanned visits and emergency visits (RR = 2.33, 95% confidence interval (CI) = [1.50, 3.61]; and RR = 3.13, 95% CI = [1.90, 5.17], respectively). The time to the first asthma outcomes including exacerbations, unplanned visits, and emergency visits was shorter in patients with psychological symptoms than those without (all p < .001). Conclusion. Current psychological symptoms, especially anxiety combined with depression, independently predict the future risk of asthma outcomes.

Ting Zhou and Lan Wang contributed equally to this study.

• anxiety
• asthma outcomes
• depression
• future risk
• psychological symptoms

Acknowledgements

This study was supported by National Natural Science Foundation of China (30971326 and 30901907), Sichuan Youth Science & Technology Foundation (2010JQ0008), Funding Doctoral Fund of Ministry of Education of China (20070610155), and Youth Science Funding of Sichuan University (2011SCU04B17).

Declaration of Interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

Notes

Ting Zhou and Lan Wang contributed equally to this study.