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Placebo Responses on Cardiovascular, Gastrointestinal, and Respiratory Organ Functions

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Placebo

Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 225))

Abstract

It is widely acknowledged that placebo responses are accompanied by physiological changes in the central nervous system, but little is known about placebo responses on end organ functions. The present chapter aims to fill this gap by reviewing the literature on peripheral placebo responses. Overall, there is a wide range of placebo and nocebo responses on various organ functions of the cardiovascular, the gastrointestinal system, and the respiratory system. Most of these studies used expectation paradigms to elicit placebo and nocebo responses. Expectations can affect heart rate, blood pressure, coronary diameter, gastric motility, bowel motility, and lung function. Classical conditioning can induce placebo respiratory depression after prior exposure to opioid drugs, and habitual coffee drinkers show physiological arousal in response to coffee-associated stimuli. Similar to findings in placebo pain research, peripheral placebo responses can be target specific. The autonomic nervous system is a likely candidate to mediate peripheral placebo responses. Further studies are necessary to identify the brain mechanisms and pathways involved in peripheral placebo responses.

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Acknowledgments

I gratefully acknowledge Hans Distel (†) and Anja Haile for their helpful comments on the manuscript. This work has been supported by the Theophrastus Foundation (Germany) and the Schweizer-Arau-Foundation (Germany).

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Correspondence to Karin Meissner .

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© 2014 Springer-Verlag Berlin Heidelberg

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Meissner, K. (2014). Placebo Responses on Cardiovascular, Gastrointestinal, and Respiratory Organ Functions. In: Benedetti, F., Enck, P., Frisaldi, E., Schedlowski, M. (eds) Placebo. Handbook of Experimental Pharmacology, vol 225. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44519-8_11

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