Validity of the Fatigue Scale Functional Assessment of Chronic Illness Therapy Fatigue Scale (FACIT-F) in individuals with Chronic Obstructive Pulmonary Disease nn Brazil
DOI:
https://doi.org/10.1590/1809-2950/e23001924ptKeywords:
Chronic Obstructive Pulmonary Disease, Fatigue, Exercise ToleranceAbstract
Fatigue is one of the most prevalent symptoms
in individuals with Chronic Obstructive Pulmonary Disease
(COPD), but it is poorly evaluated. The Functional Assessment of Chronic Illness Therapy Fatigue Scale (FACIT-F) is one of the
main instruments used to measure fatigue. However, this instrument
has not yet been validated for the Brazilian population with COPD.
This study aimed to investigate the validity of the FACIT-F fatigue
scale in individuals with COPD. In a cross-sectional study, the
impact of symptoms (COPD Assessment Test – CAT), dyspnea
(modified Medical Research Council – MRC scale), functional
capacity (six-minute step test – 6MST), exertional fatigue (Borg
modified scale at the end of 6MST), and the FACIT-F scale to
assess multidimensional fatigue were evaluated. Concurrent
validity was assessed by associating the FACIT-F with the CAT,
and convergent validity by associating it with the number of steps,
perceived exertional fatigue, and dyspnea. Discriminant validity
was assessed by comparing fatigue with the dyspnea severity
strata. In total, 92 participants were studied (69.9±8.8 years, FEV1
:
48.4% of predicted). The FACIT-F presented an average of 30.1±10.9
points, strong concurrent validity with the CAT (r=-0.80), strong
convergent validity with dyspnea (r=−0.66), and low with exercise
capacity (r=0.40) and fatigue on exertion (r=-0.44). FACIT-F
was effective in discriminating groups with different intensities
of dyspnea. Conclusion: The FACIT-F is a valid tool for assessing
fatigue in the Brazilian population with COPD.
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