Date: January 20th, 2021

Guest Skeptics: Dr. Thorben Doll and Dr. Johannes Pott. They are both fourth year resident doctors in anesthesiology, intensive care and emergency care in St. Bernward Hospital in Hildesheim, Germany.

Thorben and Johannes have a knowledge translation project called Pin-Up-Docs. It is a German emergency medicine and intensive care podcast. Their mission is to share  knowledge with paramedics, nurses, medical student and also young doctors as they take their first steps in the field of emergency medicine. 

Each month they post new content and focus two main topics, the medical therapy of the month as well as tricks for dealing with complex emergencies. All of their shared information is based on the latest medical studies and data. Additionally, they host selected guests for special episodes, and publish blogs dedicated to more advanced medical questions or topics.

Reference: Ruberto et al. Intravenous Haloperidol Versus Ondansetron for Cannabis Hyperemesis Syndrome (HaVOC): A Randomized, Controlled Trial. Annals of EM 2020.

Case: A 32-year-old male patient presents to your emergency department (ED) with severe nausea, vomiting and abdominal pain. He reports the symptoms have been continuous for 4 or 5 hours. Over-the-counter medications like acetaminophen (paracetamol) and ibuprofen have not helped. His flatmate (roommate) says he only gets relief by taking really long, hot showers.

On examination, his vital signs are normal, and he is afebrile. The abdomen exam shows no peritoneal sign and normal bowel sounds are heard. Laboratory values are unremarkable. An ultrasound does not show any free fluids or any signs of an Ileus, appendicitis or gallbladder disease.

His pain and nausea are difficult to control with standard medications. You admit him to hospital and the next day he undergoes gastroscopy which is unremarkable.

In the afternoon the patient is seen by a nurse when he is smoking “weed” (cannabis) in the garden of the hospital. He admits to being a heavy cannabis user and his symptoms do seem to get worse when smoking weed. You suspect he has cannabis hyperemesis syndrome and discharge him home with the recommendation to stop smoking as much weed.

Background: Chronic marijuana use was recognized by Allen el al in 2004 to cause cyclical vomiting in patients from South Australia. Roche and Foster quickly reported in 2005 that this was not an isolated problem to the Adelaide Hills of South Australia. The medical condition became known as cannabinoid hyperemesis syndrome. We covered this on SGEM#46: Don’t Pass the Dutchie

 

Cannabis stimulates two receptors: CB1 and CB2. CB1 is also expressed in the GI-system and reduces motility and relaxes the esophageal sphincter tonus. If you conduct chronical cannabis abuse, it seems that the anti-nausea effect of cannabis vanishes and there is a continuous hyperstimulation of CB1. That’s why you have abdominal pain and nausea with continuous vomiting.

There are some criteria proposed for the diagnosis of cannabinoid hyperemesis. An essential feature is long term cannabis use (often daily). There are five major features for the diagnosis and five supportive features for the diagnosis. These are listed in the table. 

Clinical Question: Can haloperidol effectively treat patients with cannabis hyperemesis syndrome?

Reference: Ruberto et al.