01-08-2010 | Original Article
Patient Expectancy and Post-chemotherapy Nausea: A Meta-analysis
Published in: Annals of Behavioral Medicine | Issue 1/2010
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Background
Post-chemotherapy nausea remains a significant burden to cancer patients. While some studies indicate that expecting nausea is predictive of experiencing nausea, there are a number of conflicting findings.
Purpose
The purpose of this study was to conduct a meta-analytic review to determine the strength of the relationship between expectancy and post-chemotherapy nausea.
Methods
The findings from 17 relevant studies (n = 2,400) identified through systematic searches of Medline, PsycInfo, and Cinhal were analyzed using a combination of meta-analytic techniques.
Results
Overall, there was a robust positive association between expectancy and post-chemotherapy nausea (ESr = 0.18, equivalent to Cohen’s d = 0.35), suggesting that patients with stronger expectancies experience more chemotherapy-induced nausea. Although weaker associations were found in studies employing multivariate analysis, specifically controlling for a history of nausea, and involving breast cancer patients, none of the moderators assessed were statistically significant.
Conclusions
These findings suggest that patient expectancies may contribute to post-chemotherapy nausea and that expectancy-based manipulations may provide a useful intervention strategy.