Cyclic Vomiting Syndrome: Underdiagnosed and Challenging to Pin Down

Cyclic Vomiting Syndrome (CVS) is often overlooked by healthcare providers, leading to a high rate of underdiagnosis. A recent study published in Neurogastroenterology & Motility underscores the insufficiencies in awareness and diagnostic criteria for CVS.

Challenges in Diagnosing CVS

Researchers from the United States conducted a study involving about 90 adult patients who maintained a daily diary for six months, tracking their symptoms, frequency, and the duration of episodes. The findings revealed significant discrepancies between the current diagnostic criteria and patients’ actual experiences.

One key issue highlighted in the study is the requirement for a minimum 7-day interval between episodes. The authors argue that this criterion, based on expert consensus rather than empirical evidence, can lead to underdiagnosis as it does not reflect clinical reality.

Expert Insight: Dr. Claudio Romano

Claudio Romano, MD, PhD, head of the Pediatric Gastroenterology and Cystic Fibrosis Unit at the University of Messina, Italy, offers a different perspective on CVS. While he acknowledges the challenges in accurate diagnosis, he disagrees with some of the study’s conclusions. Romano emphasizes that CVS is more accurately classified as a migraine variant rather than a purely gastrointestinal disorder.

“CVS is a clinical condition that presents primarily as vomiting, but it should be understood as a type of migraine,” Romano explains. “The episodes can last hours to days and are often accompanied by other symptoms such as photophobia, headaches, abdominal pain, and epigastralgia.”

Pediatric Onset and Symptoms

The pediatric form of CVS通常 begins in early childhood and is characterized by severe, uncontrollable vomiting episodes. These episodes can start early in the morning and occur several times per hour, often lasting for hours or even days. Between episodes, children typically experience no symptoms.

“Misdiagnosis is common because vomiting is often attributed to other conditions,” Romano says. “Healthcare providers might mistake these episodes for viral infections, food allergies, or intolerance.”

Adult-Onset CVS

CVS can also occur in adults, with a later onset compared to pediatrics. Adult cases are more frequent in women than in men and are often accompanied by neurological symptoms such as migraines and headaches.

“The ideal approach is to refer patients to a neurologist or neuropsychiatrist rather than a gastroenterologist,” Romano adds. “These specialists are more equipped to handle the neurological aspects of CVS.”

Management and Prevention

Once diagnosed, CVS can be managed with a combination of preventive treatments and strategies for acute episodes. Antiserotonergic medications, advanced migraine drugs, and antiepileptics are commonly prescribed to reduce the frequency of episodes.

“Antiemetics like ondansetron can be effective, but only in about 50% of cases,” Romano notes. “Using these medications early in an episode can significantly shorten its duration.”

Cannabinoid Hyperemesis Syndrome in Adults

It is also crucial to consider cannabinoid hyperemesis syndrome in adults presenting with recurrent vomiting. Contrary to popular belief, cannabis use can exacerbate rather than alleviate vomiting episodes.

“In adults with unexplained, frequent vomiting, cannabinoid hyperemesis syndrome should always be part of the differential diagnosis,” Romano warns.

Prevalence and Diagnostic Criteria

The prevalence of CVS in the general population is difficult to estimate due to a lack of reference centers in Italy. Estimates from North America and Asia suggest a prevalence of about 2%.

“The current diagnostic criteria are largely based on expert opinion rather than empirical evidence,” Romano explains. “However, we have observed patients with up to two episodes per month, each separated by at least 15 days. Weekly episodes are more likely to be chronic vomiting rather than CVS.”

Collaboration Between Specialists

Effective diagnosis and management of CVS require collaboration between specialists. Neurologists, gastroenterologists, and neuropsychiatrists should work together to rule out other potential causes and provide the best care for patients.

“Doctors should suspect CVS in patients with recurring vomiting episodes and consult a neurologist first,” Romano concludes.

This story was translated and edited for clarity and SEO optimization, using AI and human reviews.