2025 AMA Research Challenge – Member Premier Access

October 22, 2025

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Abstract Title Propofol-Induced Cannabinoid Hyperemesis Syndrome in a Chronic Cannabis User

Background

Cannabinoid Hyperemesis Syndrome (CHS) is a paradoxical condition in chronic cannabis users characterized by cyclic nausea and vomiting, despite cannabis's known antiemetic effects. Propofol-induced Cannabinoid Hyperemesis Syndrome (PI-CHS) is an emerging, under-recognized phenomenon in which propofol anesthesia may trigger CHS-like symptoms in chronic cannabis users. The suspected mechanism involves propofol’s lipophilic nature mobilizing stored delta-9-tetrahydrocannabinol (THC) from adipose tissue, potentially precipitating an acute emetic response.

Case Presentation

A 56-year-old male presented at the stand-alone surgical center for a routine screening colonoscopy. He reported daily cannabis use for over 40 years, with no history of chronic illness, alcohol, or tobacco use. His previous colonoscopy, performed six years prior, was followed by severe nausea and vomiting, which he attributed to an unknown cause at the time. Preoperative evaluation was otherwise unremarkable. He denied baseline gastrointestinal symptoms, cyclic vomiting, or any personal or family history of anesthesia complications. Following the current colonoscopy, which was performed under propofol sedation, the patient again developed intractable nausea and vomiting within hours post-procedure, necessitating emergency department evaluation. Workup revealed no surgical or infectious cause. Supportive care and cessation of cannabis use led to resolution of symptoms over several days.

Discussion

This case highlights a potential association between propofol administration and the unmasking of CHS in chronic cannabis users. The theory that propofol may mobilize THC from fat stores into circulation offers a possible mechanism for PI-CHS. As cannabis use continues to rise, anesthesiologists and perioperative providers should be aware of this phenomenon. Preoperative screening for chronic cannabis use may help identify at-risk patients and guide perioperative planning. Further studies are needed to elucidate the pathophysiology of PI-CHS and to establish appropriate prevention and management strategies.

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