Cannabinoid hyperemesis syndrome
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Cannabinoid Hyperemesis Syndrome: An Overview
Introduction to Cannabinoid Hyperemesis Syndrome (CHS)
Cannabinoid Hyperemesis Syndrome (CHS) is a condition characterized by cyclic episodes of severe nausea, vomiting, and abdominal pain in individuals with chronic cannabis use. Despite cannabis's well-known antiemetic properties, CHS presents a paradoxical proemetic effect, particularly in long-term, high-dose users 157.
Epidemiology and Demographics
CHS predominantly affects young male adults who have been using cannabis daily for several years . However, it is also observed in adolescents, with some cases reported as early as age 15. Interestingly, in the adolescent population, CHS may present more frequently in females .
Clinical Presentation and Diagnosis
Patients with CHS typically present with intractable nausea and vomiting, often seeking relief through compulsive hot showers or baths, which is a hallmark behavior of the syndrome 145. The diagnosis of CHS can be challenging due to its symptomatic overlap with other gastrointestinal disorders and the general lack of awareness among healthcare providers 78. A thorough patient history, including cannabis use patterns and symptom relief with hot showers, is crucial for accurate diagnosis 69.
Pathophysiology
The exact pathophysiology of CHS remains unclear. However, it is hypothesized that prolonged high doses of Δ9-tetrahydrocannabinol (THC) disrupt the endocannabinoid system, affecting stress and anxiety responses, thermoregulation, and various neurotransmitter systems . This disruption may lead to the cyclical vomiting and abdominal pain observed in CHS .
Treatment and Management
The most effective treatment for CHS is the complete cessation of cannabis use, which leads to the resolution of symptoms 258. In the acute setting, supportive care with intravenous fluids, benzodiazepines, haloperidol, and topical capsaicin cream has shown some benefit 38. Traditional antiemetics and dopamine antagonists are generally ineffective 14.
Prognosis and Long-term Outcomes
Following an emergency department (ED) visit, many patients experience persistent symptoms for up to two weeks, with a median duration of seven days . Although cannabis use often decreases immediately after an ED visit, many patients revert to their previous usage patterns within a few days, leading to recurrent symptoms and ED visits . Longitudinal studies are needed to better understand the long-term clinical course of CHS .
Conclusion
CHS is an underrecognized condition associated with chronic cannabis use, characterized by cyclic vomiting and abdominal pain relieved by hot showers. Accurate diagnosis requires a detailed patient history, and the most effective treatment is cannabis cessation. Increased awareness and further research are essential to improve the management and understanding of CHS.
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