How side effects can improve treatment efficacy: a randomized trial
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View abstract on PubMed
Summary
This summary is machine-generated.Mild side effects can signal effective treatment, improving pain relief and patient expectations. This study explored how side effects influence treatment outcomes and brain activity, offering insights for clinical practice and trial design.
Area Of Science
- Neuroscience
- Psychology
- Pain Management
Background
- Treatment side effects can negatively impact patients but may also indicate treatment efficacy.
- Understanding the psychological and neurological mechanisms linking side effects to treatment outcomes is crucial.
Purpose Of The Study
- To investigate if and how side effects can trigger positive treatment expectations and enhance treatment outcomes.
- To explore the role of the descending pain modulatory system in mediating these effects.
Main Methods
- A pre-registered trial (DRKS00026648) with 77 healthy participants receiving thermal pain after a nasal spray.
- Nasal sprays contained either capsaicin (to induce mild burning side effect) or saline (inert).
- Functional MRI was used to assess brain activity, with participants randomized into groups based on continued or informed belief about fentanyl presence.
Main Results
- Nasal sprays with side effects resulted in lower pain perception compared to inert sprays.
- The impact of side effects on pain was moderated by individual beliefs and treatment expectations.
- Functional MRI revealed activation in the descending pain modulatory system, including the anterior cingulate cortex and periaqueductal gray.
Conclusions
- Mild side effects can act as a signal for effective treatment, positively influencing expectations and outcomes.
- These effects are mediated by the descending pain modulatory system.
- Findings have implications for optimizing clinical practice and highlight a potential confound in placebo-controlled trials.
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