Concomitant benzodiazepine and opioids decrease sleep apnoea risk in chronic pain patients

Soodaba Mir; Jean Wong; Clodagh M Ryan; Geoff Bellingham; Mandeep Singh; Rida Waseem; Danny J Eckert; Frances Chung

doi:10.1183/23120541.00093-2020

Concomitant benzodiazepine and opioids decrease sleep apnoea risk in chronic pain patients

ERJ Open Res. 2020 Aug 25;6(3):00093-2020. doi: 10.1183/23120541.00093-2020. eCollection 2020 Jul.

Authors

Soodaba Mir¹, Jean Wong^{1

2}, Clodagh M Ryan³, Geoff Bellingham⁴, Mandeep Singh¹, Rida Waseem¹, Danny J Eckert⁵, Frances Chung¹

Affiliations

¹ Dept of Anesthesia and Pain Medicine, University Health Network, University of Toronto, Toronto, ON, Canada.
² Dept of Anesthesia and Pain Medicine, Women's College Hospital, University of Toronto, Toronto, ON, Canada.
³ Centre of Sleep Health and Research, Dept of Medicine, University Health Network, University of Toronto, Toronto, ON, Canada.
⁴ Dept of Anesthesia and Perioperative Medicine, St Joseph's Health Care, Western University, London, ON, Canada.
⁵ Adelaide Institute for Sleep Health, Flinders University, Bedford Park, SA, Australia.

Abstract

Background: The concurrent use of sedating centrally acting drugs and opioids by chronic pain patients occurs routinely despite concerns of negative impacts on respiration during sleep. The effects of centrally acting drugs and opioids on sleep apnoea have not been well characterised. The objective of this study was to assess the effect of concomitant centrally acting drugs and opioids on the prevalence and severity of sleep apnoea in chronic pain patients.

Methods: We conducted a prospective cohort study at five chronic pain clinics. Each participant underwent an in-laboratory polysomnography and daily morphine milligram equivalents were calculated. Participants were grouped into centrally acting drugs and opioid users versus sole opioid users.

Results: Of the 332 consented participants, 204 underwent polysomnography and 120 (58.8%) had sleep apnoea (72% obstructive, 20% central, and 8% indeterminate sleep apnoea). Overall, 35% (71 of 204) were taking opioids alone, and 65% (133 of 204) were taking centrally acting drugs and opioids. There was a 69% decrease in the odds of having sleep apnoea (apnoea-hypopnoea index ≥5 events·h^-1) in participants taking benzodiazepine/opioids versus sole opioid users (OR 0.31, 95% CI:0.12-0.80, p=0.015). Additionally, concomitant benzodiazepine/opioids versus sole opioid use was associated with a decrease in respiratory arousal index scores (p=0.03). Mean overnight S _pO₂ was approximately 1% lower in the concomitant benzodiazepine/opioids group versus sole opioid users (93.1±2.5 versus 94.4±2.1%, p=0.01).

Conclusion: In chronic pain patients on opioids, administration of certain benzodiazepine sedatives induced a mild respiratory depression but paradoxically reduced sleep apnoea risk and severity by increasing the respiratory arousal threshold.