A Breathlessness Catastrophizing Scale for chronic obstructive pulmonary disease.

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.