A Breathlessness Catastrophizing Scale for chronic obstructive pulmonary disease.

ABSTRACT

OBJECTIVE: Catastrophizing about breathlessness may be related to disability in patients with chronic obstructive pulmonary disease (COPD), but assessment options are limited. This study reports the initial validation of a 13-item Breathlessness Catastrophizing Scale (BCS). METHOD: Pulmonary rehabilitation inpatients completed spirometric, functional performance and questionnaire assessments at admission (N=242) and discharge (n=186). RESULTS: The BCS comprised a unifactorial scale that demonstrated excellent internal consistency (Cronbach's alpha=.96) and correlated with measures of anxiety sensitivity, depression, and self-efficacy, but not with performance on walk and stair-climbing tests. BCS scores improved robustly with rehabilitation, approaching a medium effect size (d=.43), and demonstrated a modest association with enhanced performance in a stair-climbing test of exercise tolerance. CONCLUSION: The BCS is a reliable measure of catastrophizing in severe COPD that has good convergent validity and sensitivity to change. Its association with functional performance requires further investigation. However, it appears that a high level of catastrophizing about breathlessness is not a barrier to functional improvement with inpatient pulmonary rehabilitation.