Cannabis hyperemesis syndrome: Incidence and treatment with topical capsaicin

There are few studies in Spain on cannabinoid hyperemesis syndrome (CHS), as well as on the use of topical capsaicin as a treatment. Methods: Retrospective study of patients over 14 years of age seen in a hospital emergency department during 2018 and 2019 with a diagnosis of CHS based on the following criteria: compatible clinical picture, cannabis use less than 48 h and positive urine cannabis test. Epidemiological and clinical variables, attendance times and treatment (including use of topical capsaicin 0.075%) were collected. Results: Fifty-nine attendances were studied, from 29 patients (4.4 cases/10,000 visits, 95% CI 2.8-4.7). Fifty per cent returned for CHS, differing only in more tobacco (A=.01) and cocaine (A=.031) use. Capsaicin was used in 74.6% of visits. The mean time to resolution of vomiting after application was 17.87 min. Conclusions: Although probably underdiagnosed, CHS has a low incidence in the emergency department in Spain, with high patient recurrence. The use of capsaicin ointment is efficient and safe. (C) 2021 Elsevier Espana, S.L.U. All rights reserved.