Cyclic Vomiting Syndrome Workup

  • Author: Thangam Venkatesan, MBBS; Chief Editor: Carmen Cuffari, MD   more...
 
Updated: Apr 23, 2010
 

Laboratory Studies

A heterogeneous group of disorders can mimic cyclic vomiting syndrome (CVS), and these disorders must be excluded with systematic laboratory and radiographic testing. An analysis by Li and colleagues demonstrated 3 main categories to consider in the differential diagnoses: GI disorders, extraintestinal disorders, and idiopathic cyclic vomiting syndrome.[43]

  • When evaluating for GI diseases, screening blood work should include a CBC count with differential, erythrocyte sedimentation rate (ESR), and levels of hepatic transaminases, pancreatic amylase, and lipase.
  • Nonanatomic renal disease can be detected using serum BUN and creatinine tests, urinalysis, and urine calcium-to-creatinine ratio.[44]
  • Screening for multiple metabolic and endocrine disorders can be accomplished by assessing electrolytes, pH, glucose, lactic acid, ammonia, amino acids, ACTH, and antidiuretic hormone (ADH).
  • Urinary ketones, organic acids, ester-to-free carnitine ratio, porphobilinogen, and aminolevulinic acid may also guide diagnosis in the correct direction.[44] These metabolic and endocrine tests must be obtained during the episode to detect intermittent disorders (eg, disorder of fatty acid oxidation) or heterozygote disorders (eg, partial ornithine transcarbamylase deficiency).
  • Blood and urine tests must be performed before starting intravenous fluids that contain glucose or other medical treatments.
  • In a postmenarchal girl, the physician must consider a beta human chorionic gonadotropin (bhCG) test for pregnancy.[44]
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Imaging Studies

The following imaging studies may be indicated:

  • When evaluating for GI diseases, an upper GI (UGI) with small-bowel followthrough (SBFT) radiography, esophagogastroduodenoscopy (EGD), abdominal ultrasonography, or CT and gastric-emptying scanning may provide definitive information.[44]
  • When evaluating for neurologic or otolaryngologic diseases, a sinus CT scan or brain MRI should be considered.[44] CT scans may not adequately visualize the subtentorial region.
  • Obstructive renal disease can be revealed with renal ultrasonography or CT imaging.[44]
  • With a broad array of possible diagnoses and possible diagnostic approaches, an extensive evaluation may appear cumbersome. Olson and Li reported that UGI radiography followed by empiric antimigraine therapy for 2 months is the most cost-effective approach ($1600) for the initial treatment of recurrent episodic vomiting in children ($3020 for extensive diagnostic evaluation, and $1830 for empiric treatment alone).[45] Until prospective trials are conducted, the authors' current approach generally includes initial blood and urine screens, including metabolic screening and UGI at initial presentation.
  • The presence of specific symptoms such as hematemesis, bilious vomiting, persistent headache, flank pain, acidosis, or uncharacteristically severe or atypical vomiting episodes should raise the clinician's index of suspicion of an underlying disorder and should warrant a prompt and more extensive or repeat evaluation.[45] The 4 tests with the highest yield include endoscopy, sinus radiography or CT imaging, small-bowel radiography, and head CT imaging or MRI.[44]
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Other Tests

Other tests that may be indicated include the following:

  • A psychological evaluation may reveal ongoing panic, anxiety, and eating disorders, and stress management may attenuate the stress triggers.[44]
  • In summary, because no biochemical markers have been identified, the recent NASPHAGN guidelines suggest that physicians must initially look for alarming symptoms and tailor their work up accordingly. Suspicious symptoms include the following:
    • Bilious vomiting, abdominal tenderness, and/or severe abdominal pain
    • Attacks precipitated by intercurrent illness, fasting, and/or high protein meal
    • Abnormal neurologic examination findings, including severe alteration of mental status, abnormal eye movements, papilledema, motor asymmetry, and/or gait abnormality (ataxia)
    • Progressively worsening episodes or conversion to a continuous or chronic pattern
  • Depending on the presenting symptoms and signs other than vomiting, different diagnostic approaches are recommended. In addition, certain subgroups of patients are thought to be at high risk for metabolic disorders; if the following conditions are met, early referral to a metabolic specialist or neurologist should be considered:
    • Presentation younger than age 2 years (with cyclic vomiting or comorbidities below)
    • Vomiting episodes associated with intercurrent illnesses, prior fasting, and/or increased protein intake
    • Any neurological finding, including ataxia, dystonia, or another gait disturbance; mental retardation; or seizure disorder or acute encephalopathy (including true lethargy, severe irritability, confusion, psychosis, or rapidly changing/unstable mental status)
    • Laboratory metabolic findings, including hypoglycemia, substantial anion gap metabolic acidosis, respiratory alkalosis, or hyperammonemia
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Contributor Information and Disclosures
Author

Thangam Venkatesan, MBBS  Assistant Professor, Department of Internal Medicine, Division of Gastroenterology and Hepatology, Medical College of Wisconsin

Thangam Venkatesan, MBBS is a member of the following medical societies: American Gastroenterological Association and Indian Medical Association

Disclosure: Nothing to disclose.

Coauthor(s)

B UK Li, MD  Professor of Pediatrics, Division of Gastroenterology, Hepatology and Nutrition, Director, Pediatric Fellowships and Gastroenterology Fellowship, Medical Director, Functional Gastrointestinal Disorders and Cyclic Vomiting Program, Medical College of Wisconsin; Attending Gastroenterologist, Children's Hospital of Wisconsin

B UK Li, MD is a member of the following medical societies: Alpha Omega Alpha, American Gastroenterological Association, and North American Society for Pediatric Gastroenterology and Nutrition

Disclosure: Nothing to disclose.

Seth Marcus, MD  Fellow, Department of Pediatric Gastroenterology, Hepatology and Nutrition, Children's Memorial Hospital, Northwestern University

Seth Marcus, MD is a member of the following medical societies: American Academy of Pediatrics and North American Society for Pediatric Gastroenterology and Nutrition

Disclosure: Nothing to disclose.

Shikha Sundaram, MD  Fellow, Department of Gastroenterology, Hepatology and Nutrition, Children's Memorial Hospital of Chicago and Northwestern University

Shikha Sundaram, MD is a member of the following medical societies: American Academy of Pediatrics and American Medical Association

Disclosure: Nothing to disclose.

Abhilasha Pandey, MBBS  Froedtert Hospital, Medical College of Wisconsin

Disclosure: Nothing to disclose.

Specialty Editor Board

Jayant Deodhar, MD  Associate Professor in Pediatrics, BJ Medical College, India; Honorary Consultant, Departments of Pediatrics and Neonatology, King Edward Memorial Hospital, India

Disclosure: Nothing to disclose.

Mary L Windle, PharmD  Adjunct Associate Professor, University of Nebraska Medical Center College of Pharmacy; Pharmacy Editor, eMedicine

Disclosure: Nothing to disclose.

David A Piccoli, MD  Chief of Pediatric Gastroenterology, Hepatology and Nutrition, The Children's Hospital of Philadelphia; Professor, University of Pennsylvania School of Medicine

David A Piccoli, MD is a member of the following medical societies: American Association for the Study of Liver Diseases, American Gastroenterological Association, and North American Society for Pediatric Gastroenterology and Nutrition

Disclosure: Nothing to disclose.

Steven M Schwarz, MD, FAAP, FACN, AGAF  Professor of Pediatrics, Children's Hospital at Downstate, SUNY-Downstate Medical Center

Steven M Schwarz, MD, FAAP, FACN, AGAF is a member of the following medical societies: American Academy of Pediatrics, American College of Nutrition, American College of Physician Executives, American Gastroenterological Association, American Pediatric Society, Gastroenterology Research Group, New York Academy of Medicine, North American Society for Pediatric Gastroenterology and Nutrition, and Society for Pediatric Research

Disclosure: Curemark, LLC Consulting fee Board membership; Centocor, Inc. Grant/research funds Independent contractor; Johnson & Johnson, Inc. Grant/research funds Independent contractor

Chief Editor

Carmen Cuffari, MD  Associate Professor, Department of Pediatrics, Division of Gastroenterology/Nutrition, Johns Hopkins University School of Medicine

Carmen Cuffari, MD is a member of the following medical societies: American College of Gastroenterology, American Gastroenterological Association, North American Society for Pediatric Gastroenterology, Hepatology and Nutrition, and Royal College of Physicians and Surgeons of Canada

Disclosure: Nothing to disclose.

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Cyclic versus chronic temporal patterns of recurrent vomiting. The number of emeses is plotted over a 2-month period. The chronic pattern, represented by a thin dashed line, has low grade on nearly a daily basis (eg, gastroesophageal reflux). The cyclic pattern, represented by a heavy solid line, involves high-intensity episodes intermittently once every several weeks (eg, cyclic vomiting syndrome).
Table 1. Characteristics of Emergency Department Visits in Patients With Cyclic Vomiting Syndrome
CharacteristicAdults



(n = 104)



Children



(n = 147)



Number of ED visits per patient with cyclic vomiting syndrome (Median)15 (range, 1-200)10 (range, 1-175)
Number of ED visits prior to a diagnosis of cyclic vomiting syndrome (Median)7 (Range, 1-150)5 (Range, 0-65)
Diagnosis not made in the ED89 (93%)119 (93%)
Diagnosis not recognized in the ED in patients with an established diagnosis of cyclic vomiting syndrome84 (88%)97 (80%)
Number of different ED visited (Mean ± standard deviation)4.69 ± 4.722.6 ± 2.42
Table 2. Clinical Features in Adults and Children with Cyclic Vomiting Syndrome[39]
Feature ChildrenAdults
Age of Onset4.8 y (Earliest, 6 d)35 y (Latest, 73 y)
Delay in Diagnosis2.6 y8 y
Female-to-Male Ratio57:4317:24
FrequencyEvery 2-4 wkEvery 3 mo
Duration (Mean)1-2 d (range, 1-10 d)6 d (range, 1-21 d)
Periodicity49%Not reported
Early Morning Onset42%50%
Stereotypical Episodes99%85%
Prodrome72%, 1.5 h93%
SymptomsNausea, anorexia, pallorNausea, epigastric pain
Recovery to Oral Feeding6 h24 h
Relieving FactorsDeep sleepHot bath/shower (56%)
Precipitating FactorsStress (47%), infection (31%)Menses (57%), anxiety
Comorbid conditionsAnxietyNot reported
Interepisodic nausea< 6%63%
Coalescence of EpisodesFew50%
Vomiting6/hr at peak, bile (81%)8.5/hr
Systemic SymptomsPallor, salivation, listlessnessIntense thirst (33%)
GI SymptomsAnorexia, nausea, diarrhea, abdominal painAbdominal pain, diarrhea
Neurologic SymptomsHeadache, photophobia, phonophobia, abdominal painIrritable, confused
Natural history≥ 28% progress to migraineNot reported
Family history82%57%
ComplicationsDehydration, esophagitisDehydration, esophagitis, laparotomy (18%)
Morbidity14-25 d of missed school/year32% completely disabled
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