Tradução, adaptação transcultural e validação do Chronic Pain Acceptance Questionnaire - 8 em brasileiros com dor crônica oncológica

Abstract

Introduction: Chronic cancer-related pain is common and negatively affects functioning, emotional status, and quality of life. It may result from tumor progression, invasion or compression of neural structures, and antineoplastic treatments themselves, presenting nociceptive, neuropathic, or mixed components. Pain acceptance is a central psychological process in contemporary pain management models, associated with engagement in important activities despite pain and willingness to experience pain without attempting to control it. In Brazil, psychometric evidence for the Chronic Pain Acceptance Questionnaire–8 (CPAQ-8) remains scarce. Objectives: To translate, cross‑culturally adapt and validate the CPAQ‑8 for patients with chronic cancer‑related pain. Methods: This methodological study was conducted according to COSMIN guidelines. The eight CPAQ-8 items, grouped into Activity Engagement and Pain Willingness, were translated, back-translated, reviewed by experts, and administered to 136 adults diagnosed with cancer and chronic pain. After pretesting, confirmatory factor analysis, internal consistency (Cronbach’s alpha), test retest reliability (intraclass correlation coefficient), standard error of measurement, minimal detectable change, and correlations with measures of quality of life (EORTC QLQ-C30), functionality (Barthel Index), emotional symptoms (HADS), catastrophizing (PCS), and pain intensity were analyzed. Results: The two‑factor structure was partially confirmed, although one item showed a low loading. Internal consistency was low in both domains, probably due to the small number of items and the heterogeneity of the sample, but test–retest reliability was good to excellent. The Activity Engagement domain correlated moderately with functionality, quality of life and emotional symptoms, and negatively with anxiety, depression and catastrophizing. There was no significant correlation with pain intensity. Conclusion: The Brazilian version of the CPAQ‑8 provides initial evidence of construct validity and temporal reliability in patients with chronic cancer‑related pain, although the low internal consistency requires further studies to deepen its psychometric properties.