Impact of psychiatric illness upon asthma patients’ health care utilization and illness control. Are all psychiatric comorbidities created equal?

Abstract

The impact of psychiatric illnesses upon asthma patients' functioning is not well understood. This study examined the impact of psychiatric comorbidity upon illness management in asthma patients using empirically-derived psychiatric comorbidity groups. Participants were a clinic sample of Greek-speaking asthma patients (N = 212) assessed using the Patient Health Questionnaire (PHQ) Somatoform, Depression, Panic Disorder (PD), Other Anxiety Disorder, Eating Disorder (ED) and Alcohol sub-scales. The associations between sub-scales were examined using multiway frequency analysis. The following groups were derived: Somatoform disorder and/or Any Depressive disorder (n = 63), Somatoform disorder and/or Other Anxiety disorder (n = 51), Somatoform disorder and/or Any ED (n = 60), and Any Anxiety group including PD and/or Other Anxiety disorder (n = 24). Across all groups, psychiatric illness was associated with significantly worse asthma control (p < .01). Participants in Any Anxiety group, OR = 4.61, 95% CI [1.90, 11.15], Somatoform and/or Any Depressive disorder, OR = 2.06, 95% CI [1.04, 4.09] and Somatoform and/or Other Anxiety disorder, OR = 2.75, 95% CI [1.35, 5.60] were at higher risk for asthma-related Emergency Room (ER) visits compared to controls. However only Somatoform and/or Any Depressive disorder, OR = 3.67, 95% CI [1.60, 8.72], Somatoform and/or Other Anxiety disorder, OR = 5.50, 95% CI [2.34, 12.74], and Somatoform and/or Any ED, OR = 4.98, 95% CI [2.14, 11.60] group membership were risk factors for asthma-related hospitalizations. Results suggest that while comorbid psychiatric disorders generally negatively impact asthma illness management, different psychiatric comorbidities appear to have disparate effects upon illness management outcomes.

Keywords:

• Psychiatric comorbidity
• asthma
• illness management
• healthcare utilization

Acknowledgements

Part of this study was funded by the Cyprus Research Promotion Foundation, Thematic Action Grant, DESMI 2008, ΑΝΘΡΩΠΙΣΤΙΚΕΣ/ΚΟΙΝΩ/0308(ΒΙΕ) awarded to Maria Karekla, Ph.D. The authors would like to thank the participants, the medical staff of the Nicosia General Hospital, and the student volunteers at the University of Cyprus for their help in data collection.

Disclosure statement

No potential conflict of interest was reported by the authors.