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Grosso F, Barbiani D, Cavalera C, Volpato E, Pagnini F. Risk factors associated with nocebo effects: A review of reviews. Brain Behav Immun Health 2024; 38:100800. [PMID: 39021437 PMCID: PMC11252084 DOI: 10.1016/j.bbih.2024.100800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 05/02/2024] [Accepted: 05/21/2024] [Indexed: 07/20/2024] Open
Abstract
Objective This meta-review aims to identify and categorize the risk factors that are associated with nocebo effects. The nocebo effect can exert a negative impact on treatment outcomes and have detrimental outcomes on health. Learning more about its potential predictors and risk factors is a crucial step to mitigating it. Methods Literature review studies about the risk factors for nocebo effects were searched through five databases (PubMed, Scopus, The Cochrane Library, PsycINFO, and Embase) and through grey literature. Methodological validity and risk of bias were assessed. We conducted a thematic analysis of the results of the forty-three included reviews. Results We identified nine categories of risk factors: prior expectations and learning; socio-demographic characteristics; personality and individual differences; neurodegenerative conditions; inflammatory conditions; communication of information and patient-physician relationship; drug characteristics; setting; and self-awareness. We also highlighted the main biochemical and neurophysiological mechanisms underlying nocebo effects. Conclusions Nocebo effects arise from expectations of adverse symptoms, particularly when triggered by previous negative experiences. A trusting relationship with the treating physician and clear, tailored treatment instructions can act as protective factors against a nocebo effect. Clinical implications are discussed.
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Affiliation(s)
- Francesca Grosso
- Department of Psychology, Università Cattolica del Sacro Cuore, Milan, Italy
- IRCCS Fondazione Don Carlo Gnocchi, Milan, Italy
| | - Diletta Barbiani
- Department of Psychology, Università Cattolica del Sacro Cuore, Milan, Italy
| | - Cesare Cavalera
- Department of Psychology, Università Cattolica del Sacro Cuore, Milan, Italy
| | - Eleonora Volpato
- Department of Psychology, Università Cattolica del Sacro Cuore, Milan, Italy
- IRCCS Fondazione Don Carlo Gnocchi, Milan, Italy
| | - Francesco Pagnini
- Department of Psychology, Università Cattolica del Sacro Cuore, Milan, Italy
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Tang B, Livesey E, Colagiuri B. The downside to choice: instrumental control increases conditioned nocebo hyperalgesia. Pain 2024:00006396-990000000-00588. [PMID: 38709490 DOI: 10.1097/j.pain.0000000000003251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 03/12/2024] [Indexed: 05/07/2024]
Abstract
ABSTRACT Nocebo hyperalgesia is a pervasive problem in which the treatment context triggers negative expectations that exacerbate pain. Thus, developing ethical strategies to mitigate nocebo hyperalgesia is crucial. Emerging research suggests that choice has the capacity to reduce nocebo side effects, but choice effects on nocebo hyperalgesia have not been explored. This study investigated the impact of choice on conditioned nocebo hyperalgesia using a well-established electrocutaneous pain paradigm where increases in noxious stimulation were surreptitiously paired with the activation of a sham device. In study 1, healthy volunteers (N = 104) were randomised to choice over (nocebo) treatment administration, nocebo administration without choice, or a natural history control group. Nocebo hyperalgesia was greater for those with choice than no choice, suggesting that choice increased rather than diminished nocebo hyperalgesia. Study 2 tested whether providing positive information about the benefits of choice in coping with pain could counteract heightened nocebo hyperalgesia caused by choice. A different sample of healthy adults (N = 137) were randomised to receive nocebo treatment with choice and positive choice information, choice only, or no choice. The positive choice information failed to attenuate the effect of choice on nocebo hyperalgesia. The current results suggest that, rather than decreasing nocebo hyperalgesia, treatment choice may exacerbate pain outcomes when a painful procedure is repeatedly administered. As such, using choice as a strategy to mitigate nocebo outcomes should be treated with caution.
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Affiliation(s)
- Biya Tang
- School of Psychology, The University of Sydney, Sydney, Australia
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Druart L, Graham Longsworth SE, Terrisse H, Locher C, Blease C, Rolland C, Pinsault N. If only they knew! A non-inferiority randomized controlled trial comparing deceptive and open-label placebo in healthy individuals. Eur J Pain 2024; 28:491-501. [PMID: 37965922 DOI: 10.1002/ejp.2204] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 09/26/2023] [Accepted: 11/03/2023] [Indexed: 11/16/2023]
Abstract
BACKGROUND Placebo use is widespread in clinical practice. However, they are most often administered deceptively rather than openly. It is often suggested that open-label placebos (OLP) are less effective than deceptive placebos (DP). This study aimed to compare the use of DP and OLP treatments to reduce pain in healthy volunteers. METHODS We conducted a non-inferiority, parallel, randomized, controlled trial, which also included a nested cross-over no-treatment condition. This study was conducted at a university clinic in France. RESULTS We included 60 subjects and the main result shows that the OLP was not inferior to the DP by a margin of 10 mm. The mean difference between both groups regarding intensity of pain was 0.7 mm with a 95% compatibility interval (95% CI) of ]-∞; 5.4], and 97.5% CI of ]-∞; 6.3]. Secondary outcomes require cautious interpretation of the effect of placebo versus no treatment due to a time-treatment interaction. CONCLUSION The study indicates that OLP may perform just as well as DP and could provide support for the use of OLP as an ethical alternative to DP when they are to be used in a clinical setting. If only patients knew about the placebo nature of some treatments they are receiving, unnecessary lies could be avoided while maintaining similar placebo effects. SIGNIFICANCE This study is the first to show non-inferiority of placebos administered honestly, also called OLP, compared to DP in reducing pain. This suggests that OLP could be as effective as their deceptive counterparts while having the ethical advantage of not being required to lie. If deception is not a necessary condition for efficacy, OLP should be preferred over DP.
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Affiliation(s)
- L Druart
- Univ. Grenoble Alpes, CNRS, UMR 5525, VetAgro Sup, Grenoble INP, TIMC, Grenoble, France
- Department of Physiotherapy, University Grenoble Alpes, Grenoble, France
| | - S E Graham Longsworth
- Univ. Grenoble Alpes, CNRS, UMR 5525, VetAgro Sup, Grenoble INP, TIMC, Grenoble, France
- Department of Physiotherapy, University Grenoble Alpes, Grenoble, France
| | - H Terrisse
- Univ. Grenoble Alpes, CNRS, UMR 5525, VetAgro Sup, Grenoble INP, TIMC, Grenoble, France
| | - C Locher
- Department of Consultation-Liaison Psychiatry and Psychosomatic Medicine, University Hospital Zurich, Zurich, Switzerland
| | - C Blease
- Department of Psychiatry, Digital Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - C Rolland
- Univ. Grenoble Alpes, CNRS, UMR 5525, VetAgro Sup, Grenoble INP, TIMC, Grenoble, France
| | - N Pinsault
- Univ. Grenoble Alpes, CNRS, UMR 5525, VetAgro Sup, Grenoble INP, TIMC, Grenoble, France
- Department of Physiotherapy, University Grenoble Alpes, Grenoble, France
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Meeuwis SH, Wasylewski MT, Bajcar EA, Bieniek H, Adamczyk WM, Honcharova S, Di Nardo M, Mazzoni G, Bąbel P. Learning pain from others: a systematic review and meta-analysis of studies on placebo hypoalgesia and nocebo hyperalgesia induced by observational learning. Pain 2023; 164:2383-2396. [PMID: 37326688 PMCID: PMC10578425 DOI: 10.1097/j.pain.0000000000002943] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 03/10/2023] [Accepted: 03/23/2023] [Indexed: 06/17/2023]
Abstract
ABSTRACT Observing someone experience pain relief or exacerbation after an intervention may induce placebo hypoalgesia or nocebo hyperalgesia. Understanding the factors that contribute to these effects could help in the development of strategies for optimizing treatment of chronic pain conditions. We systematically reviewed and meta-analyzed the literature on placebo hypoalgesia and nocebo hyperalgesia induced by observational learning (OL). A systematic literature search was conducted in the databases PubMed, PsycINFO, Web of Science, ScienceDirect, PsycARTICLES, Scopus, and Academic Search Ultimate. Twenty-one studies were included in the systematic review, 17 of which were suitable for meta-analysis (18 experiments; n = 764 healthy individuals). The primary end point was the standardized mean difference (SMD) for pain following placebo cues associated during OL with low vs high pain. Observational learning had a small-to-medium effect on pain ratings (SMD 0.44; 95% confidence interval [CI] 0.21-0.68; P < 0.01) and a large effect on pain expectancy (SMD 1.11; 95% CI 0.49-2.04; P < 0.01). The type of observation (in-person vs videotaped) modulated the magnitude of placebo hypoalgesia/nocebo hyperalgesia ( P < 0.01), whereas placebo type did not ( P = 0.23). Finally, OL was more effective when observers' empathic concern (but no other empathy-related factors) was higher ( r = 0.14; 95% CI 0.01-0.27; P = 0.03). Overall, the meta-analysis demonstrates that OL can shape placebo hypoalgesia and nocebo hyperalgesia. More research is needed to identify predictors of these effects and to study them in clinical populations. In the future, OL could be an important tool to help maximize placebo hypoalgesia in clinical settings.
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Affiliation(s)
- Stefanie H. Meeuwis
- Jagiellonian University, Institute of Psychology, Pain Research Group, Kraków, Poland
| | - Mateusz T. Wasylewski
- Jagiellonian University, Institute of Psychology, Pain Research Group, Kraków, Poland
| | - Elżbieta A. Bajcar
- Jagiellonian University, Institute of Psychology, Pain Research Group, Kraków, Poland
| | - Helena Bieniek
- Jagiellonian University, Institute of Psychology, Pain Research Group, Kraków, Poland
| | - Wacław M. Adamczyk
- Jagiellonian University, Institute of Psychology, Pain Research Group, Kraków, Poland
- The Jerzy Kukuczka Academy of Physical Education, Institute of Physiotherapy and Health Sciences, Katowice, Poland
| | - Sofiia Honcharova
- Jagiellonian University, Institute of Psychology, Pain Research Group, Kraków, Poland
| | - Marianna Di Nardo
- Department of Dynamic, Clinical Psychology and Health, Sapienza University of Rome, Rome, Italy
| | - Giuliana Mazzoni
- Department of Dynamic, Clinical Psychology and Health, Sapienza University of Rome, Rome, Italy
| | - Przemysław Bąbel
- Jagiellonian University, Institute of Psychology, Pain Research Group, Kraków, Poland
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Jones CMP, Lin CWC, Blease C, Lawson J, Abdel Shaheed C, Maher CG. Time to reflect on open-label placebos and their value for clinical practice. Pain 2023; 164:2139-2142. [PMID: 37713359 DOI: 10.1097/j.pain.0000000000003017] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 06/24/2023] [Indexed: 09/17/2023]
Affiliation(s)
- Caitlin M P Jones
- Sydney Musculoskeletal Health, The University of Sydney, Sydney, Australia
- The Institute for Musculoskeletal Health, The University of Sydney and Sydney Local Health District, Sydney, Australia
| | - Chung-Wei Christine Lin
- Sydney Musculoskeletal Health, The University of Sydney, Sydney, Australia
- The Institute for Musculoskeletal Health, The University of Sydney and Sydney Local Health District, Sydney, Australia
| | - Charlotte Blease
- Department of Women's and Children's Health, Uppsala University Sweden
- Digital Psychiatry, Department of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, United States
| | - Jen Lawson
- Patient Advocate, Kalamazoo, Michigan, United States
| | - Christina Abdel Shaheed
- Sydney Musculoskeletal Health, The University of Sydney, Sydney, Australia
- The Institute for Musculoskeletal Health, The University of Sydney and Sydney Local Health District, Sydney, Australia
- The University of Sydney, School of Public Health, Sydney, Australia
| | - Christopher G Maher
- Sydney Musculoskeletal Health, The University of Sydney, Sydney, Australia
- The Institute for Musculoskeletal Health, The University of Sydney and Sydney Local Health District, Sydney, Australia
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