Abstract
Background
Opioid analgesics inhibit anal sphincter function and contribute to opioid-induced bowel dysfunction (OIBD). However, it is unknown whether the inhibition can be reduced by opioid antagonism with prolonged-release (PR) naloxone and how this compares to laxative treatment.
Aims
To compare the effects of combined PR oxycodone/naloxone or PR oxycodone plus macrogol 3350 on anal sphincter function and gastrointestinal symptoms.
Methods
A randomized, double-blind, crossover trial was conducted in 20 healthy men. Participants were treated for 5 days with combined PR oxycodone/naloxone or PR oxycodone plus macrogol 3350. Resting anal pressure, anal canal distensibility, and relaxation of the internal sphincter to rectal distension were evaluated before treatment (baseline) and on day 5. The Patient Assessment of Constipation Symptom (PAC-SYM) questionnaire, stool frequency, and stool consistency were assessed daily.
Results
Both PR oxycodone/naloxone and PR oxycodone plus macrogol treatment decreased sphincter relaxation compared to baseline (− 27.5%; P < 0.001 and − 14.7%; P = 0.01). However, sphincter relaxation was increased after PR naloxone/oxycodone treatment compared to macrogol (difference = + 17.6%; P < 0.001). Resting anal pressure and anal canal distensibility did not differ between treatments. PAC-SYM abdominal symptoms score was lower during PR naloxone compared to macrogol (0.2 vs. 3.2; P = 0.002). The number of bowel movements was lower during PR naloxone versus macrogol (4.2 vs. 5.4; P = 0.035).
Conclusion
Relaxation of the internal anal sphincter was significantly better after PR oxycodone/naloxone treatment compared to PR oxycodone plus macrogol 3350. These findings highlight that OIBD may require specific therapy against the complex, pan-intestinal effects of opioids.
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Acknowledgments
We thank Susanne Haas, MD for her assistance in protocol design, pilot studies, and production of the balloons for rectal distension.
Funding
The study was funded in part by Innovation Fund Denmark—Individuals, Disease and Society, Grant Number 10–092786, in part by The A.P. Møller Foundation for the Advancement of Medical Science, Grant Number 14-319, in part by Aage og Johanne Louis-Hansens Fond, in part Svend Andersen Fonden, and in part by an unrestricted grant from Mundipharma Research GmbH & Co. KG.
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JLP was involved in study design; data acquisition; data interpretation; statistical analysis; drafting of manuscript, submission guarantor. CB contributed to study supervision; study design; data interpretation; drafting of the manuscript. DG, DL, and HG were involved in data acquisition; data interpretation; revision of the manuscript for important intellectual content. KK contributed to study design, data interpretation; revision of the manuscript for important intellectual content. AMD was involved in obtaining funding for the study; study supervision; study design; data interpretation; revision of the manuscript for important intellectual content. All authors approved the final version of the manuscript.
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Asbjørn Mohr Drewes has received financial support from Mundipharma, AstraZeneca, Shire, Almirall, Grünenthal, and Pfizer. Klaus Krogh has served as an advisory board member for Coloplast, Wellspect, Nordic Health Care, Amirall, and Shire. Hans Gregersen invented the EndoFLIP technology and owns a minority share (< 5%) in Crospon Ltd.
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Poulsen, J.L., Brock, C., Grønlund, D. et al. Prolonged-Release Oxycodone/Naloxone Improves Anal Sphincter Relaxation Compared to Oxycodone Plus Macrogol 3350. Dig Dis Sci 62, 3156–3166 (2017). https://doi.org/10.1007/s10620-017-4784-7
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DOI: https://doi.org/10.1007/s10620-017-4784-7