Nocebo expectations rather than placebo expectations affect topical pain relief: A randomized clinical trial

Autor: Mingxiao Yang, Qing S. Li, Raymond E. Baser, Xiaotong Li, Jason Hou, Jun J. Mao
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Biomedicine & Pharmacotherapy, Vol 175, Iss , Pp 116728- (2024)
Druh dokumentu: article
ISSN: 0753-3322
DOI: 10.1016/j.biopha.2024.116728
Popis: Patients' expectations and beliefs regarding the potential benefits and harms of medical interventions may induce placebo and nocebo effects, and affect the response to pain therapies. In a randomized clinical trial, we examined the effect of placebo and nocebo expectations on pain relief and adverse events (AEs) in association with a topical treatment among 65 cancer survivors experiencing chronic musculoskeletal pain. Participants received either a 1% camphor-based topical pain patch or a placebo treatment for 14 days. We measured pain severity with the worst pain item of the Brief Pain Inventory (BPI) at baseline and 14 days and treatment expectations at baseline with validated expectation questionnaires. We found that high vs. low nocebo expectations decreased pain severity improvements by 2.5 points (95% confidence interval [CI] −3.8 to −1.2; p
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