The Visual Analogue Scale 8 (VAS8), consisting of eight linear scales, has
been developed to measure health-related quality of life (HRQoL) in chronic
obstructive pulmonary disease (COPD) patients. The purpose of this study w
as to examine the validity and responsiveness of the VAS8.
First, HRQoL was assessed in a cross-sectional study with the VAS8 and the
St George's Respiratory Questionnaire (SGRQ) in 46 COPD patients. Relations
hips between the VAS8 and various physiological parameters were examined. S
econd, in a longitudinal study. changes in HRQoL scores after pulmonary reh
abilitation were evaluated in 29 COPD patients.
The total VAS8 scores showed a weak correlation with vital capacity and max
imal inspiratory pressure and a moderately strong correlation with 6-min wa
lking distance and dyspnoea rating. The total VAS8 score showed a significa
nt correlation with each SGRQ score. Furthermore, almost every VAS8 and SGR
Q score improved significantly after pulmonary rehabilitation. The change i
n the total VAS8 value showed a strong correlation with that of the SGRQ.
The VAS8 is well-suited to assess HRQoL in COPD patients. Visual analogue s
cales are generally useful in measuring HRQoL in COPD patients, and the VAS
8 is particularly beneficial because or its case of use.