Effect of self-reported cannabis use on postoperative outcomes: a propensity matched cohort analysis of non-cardiac surgery patients
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* Harsha Shanthanna
* Betty Huiyu Zhang
* Haris Saud
* Neil Sengupta
* Max Chen
* Devyani Bakshi
* Liz Richardson
* Li Wang

*   analgesia
*   drug-related side effects and adverse reactions
*   postoperative complications

## Abstract

Cannabis use is potentially associated with increased harms and varied effects on pain control. Zhang *et al* performed a retrospective cohort study in patients having non-cardiac surgery and compared patients who self-report cannabis use to matched controls.1 There were no differences in the composite outcome (death, myocardial infarction, stroke, cardiac or respiratory arrest, intensive care unit admission), and in the secondary outcomes of new-onset arrhythmias, pain control or nausea–vomiting.

![Figure1](http://rapm.bmj.com/https://rapm.bmj.com/content/rapm/46/8/656/F1.medium.gif)

[Figure1](http://rapm.bmj.com/content/46/8/656/F1)

## Ethics statements

### Patient consent for publication

Not required.

## Footnotes

*   Twitter @harshamd5

*   Contributors HS: Conception and study design, drafting the article, final approval and creation of infographic. BHZ: Data collection, drafting the article and final approval. HS, NS, MC, DB and LR: Data collection and final approval. LW: Study design, data analysis and final approval.

*   Funding This project received funding from the McMaster Medical Student Research Excellence Scholarship dated March 29, 2019.

*   Competing interests None declared.

*   Provenance and peer review Commissioned; internally peer reviewed.

*   Received April 6, 2021.
*   Revision received April 27, 2021.
*   Accepted April 28, 2021.


*   © American Society of Regional Anesthesia & Pain Medicine 2021. No commercial re-use. See rights and permissions. Published by BMJ.

## Reference

1.   BH Z , H S , N S . Effect of preoperative cannabis use on perioperative outcomes: a retrospective cohort study. Reg Anesth Pain Med 2021;46:650–5.
    
    [Abstract/FREE Full Text](http://rapm.bmj.com/lookup/ijlink/YTozOntzOjQ6InBhdGgiO3M6MTQ6Ii9sb29rdXAvaWpsaW5rIjtzOjU6InF1ZXJ5IjthOjQ6e3M6ODoibGlua1R5cGUiO3M6NDoiQUJTVCI7czoxMToiam91cm5hbENvZGUiO3M6NDoicmFwbSI7czo1OiJyZXNpZCI7czo4OiI0Ni84LzY1MCI7czo0OiJhdG9tIjtzOjE5OiIvcmFwbS80Ni84LzY1Ni5hdG9tIjt9czo4OiJmcmFnbWVudCI7czowOiIiO30=)