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Acute Gastroenteritis Article gastrointestinal disorders Acute Gastroenteritis Deise Granado-Villar, MD, Educational Gap MPH,* Beatriz Cunill-De Sautu, MD,† Andrea In managing acute diarrhea in children, clinicians need to be aware that management Granados, MDx based on “bowel rest” is outdated, and instead reinstitution of an appropriate diet has been associated with decreased stool volume and duration of diarrhea. In general, drug therapy is not indicated in managing diarrhea in children, although zinc supplementation Author Disclosure and probiotic use show promise. Drs Granado-Villar, Cunill-De Sautu, and Objectives After reading this article, readers should be able to: Granados have disclosed no financial 1. Recognize the electrolyte changes associated with isotonic dehydration. relationships relevant 2. Effectively manage a child who has isotonic dehydration. to this article. This 3. Understand the importance of early feedings on the nutritional status of a child who commentary does has gastroenteritis. contain a discussion of 4. Fully understand that antidiarrheal agents are not indicated nor recommended in the an unapproved/ treatment of acute gastroenteritis in children. investigative use of 5. Recognize the role of vomiting in the clinical presentation of acute gastroenteritis. a commercial product/ device. Introduction Acute gastroenteritis is an extremely common illness among infants and children world- wide. According to the Centers for Disease Control and Prevention (CDC), acute diarrhea among children in the United States accounts for more than 1.5 million outpatient visits, 200,000 hospitalizations, and approximately 300 deaths per year. In developing countries, diarrhea is a common cause of mortality among children younger than age 5 years, with an estimated 2 million deaths each year. American children younger than 5 years have an av- erage of two episodes of gastroenteritis per year, leading to 2 million to 3 million office visits and 10% of all pediatric hospital admissions. Furthermore, approximately one third of all hospitalizations for diarrhea in children younger than 5 years are due to rotavirus, with an associated direct cost of $250 million annually. (1)(2) Definitions Diarrhea is defined as the passage of three or more loose or watery stools per day (or more frequent passage of stool than is normal for the individual). Stool patterns may vary among children; thus, it is important Abbreviations to note that diarrhea should represent a change from the norm. Frequent passage of formed stools is not diarrhea, CDC: Centers for Disease Control and Prevention nor is the passing of “pasty” stools by breastfed young infants. IV: intravenous (2)(3) D K : potassium There are three clinical classifications of diarrheal D Na : sodium conditions: NG: nasogastric • ORS: oral rehydration solution Acute diarrhea, lasting several hours or days • WHO: World Health Organization Acute bloody diarrhea or dysentery • Persistent diarrhea, lasting 14 days or longer *Chief Medical Officer, Senior Vice President for Medical & Academic Affairs, Miami Children’s Hospital; Clinical Associate Professor of Pediatrics, Affiliate Dean for Miami Children’s Hospital, Herbert Wertheim College of Medicine, Florida International University. †Director, Pediatric Residency Program, Miami Children’s Hospital; Clinical Assistant Professor of Pediatrics, Herbert Wertheim College of Medicine, Florida International University. xChief Resident, Miami Children’s Hospital; currently Pediatric Endocrinology Fellow, University of Michigan. Pediatrics in Review Vol.33 No.11 November 2012 487 Downloaded from http://pedsinreview.aappublications.org/ at Siu School Of Medicine on December 3, 2019 gastrointestinal disorders gastroenteritis Clinical Presentation The clinical manifestations of acute gastroenteritis can in- Table 1. Causes of Acute clude diarrhea, vomiting, fever, anorexia, and abdominal Gastroenteritis in Children (2) cramps. Vomiting followed by diarrhea may be the initial presentation in children, or vice versa. However, when Viruses emesis is the only presenting sign, the clinician must con- Rotaviruses Noroviruses (Norwalk-like viruses) template other diagnostic possibilities, such as diabetes, Enteric adenoviruses metabolic disorders, urinary tract infections, meningitis, Caliciviruses gastrointestinal obstruction, and ingestion. The charac- Astroviruses teristics of the emesis, such as color, intensity, and fre- Enteroviruses quency, as well as relationship to feedings, often lead Bacteria Campylobacter jejuni to the most likely diagnoses. (1)(2)(4) Nontyphoid Salmonella spp A complete history and physical examination always Enteropathogenic Escherichia coli must be performed. The clinician should inquire about Shigella spp the duration of illness; the number of episodes of vomit- Yersinia enterocolitica ing and diarrhea per day; urine output; the presence of Shiga toxin producing E coli Salmonella typhi and S paratyphi blood in the stool; accompanying symptoms such as fe- Vibrio cholerae ver, abdominal pain, and urinary complaints; and recent Protozoa fluid and food intake. Recent medications and the child’s Cryptosporidium immunization history also should be reviewed. The phys- Giardia lamblia ical examination should focus on identifying signs of de- Entamoeba histolytica Helminths hydration such as level of alertness, presence of sunken Strongyloides stercoralis eyes, dry mucous membranes, and skin turgor. (1)(3) Viruses are the cause of the majority of cases of acute gastroenteritis in children worldwide. Viral infections usually are characterized by low-grade fever and watery by the World Health Organization (WHO) in 1995, which diarrhea without blood. Bacterial infections may result also divided patients into three groups: no signs of dehydra- in infiltration of the mucosal lining of the small and large tion (<3%–5%), some signs of dehydration (5%–10%), and intestines, which in turn causes inflammation. Children severe dehydration (>10%). thus are more likely to present with high fever and the The authors of studies have evaluated the correlation presence of blood and white blood cells in the stool. of clinical signs of dehydration with posttreatment weight Table 1 lists the common causal pathogens of acute gas- gain and have demonstrated that the first signs of dehy- troenteritis in children. (2) dration might not be evident until 3% to 4% dehydration. Furthermore, more obvious clinical signs of dehydration Assessment of Dehydration become apparent at 5% dehydration, and indications of fl Dehydration related to acute gastroenteritis is a major severe dehydration become evident when the uid loss concern in pediatric patients. Therefore, clinicians in pri- reaches 9% to 10%. As a result, the CDC revised its recom- mary care offices, emergency departments, and hospital mendations in 2003 and combined the mild and moderate settings must assess the circulatory volume status as part dehydration categories, acknowledging that the signs of of the initial evaluation of children presenting with acute dehydration might be apparent over a relatively wide fl gastroenteritis. This assessment is essential in guiding the range of uid loss (Table 2). The ultimate goal of this as- decision making regarding therapy and patient disposition. sessment is to identify which patients can be sent home In 1996, the CDC published recommendations on safely, which should remain under observation, and which the assessment of dehydration, which were subsequently are candidates for immediate, aggressive therapy. (1) endorsed by the American Academy of Pediatrics (AAP). These guidelines classified patients into three groups Laboratory Evaluation based on their estimated fluid deficit: mild dehydration Serum electrolytes are not indicated routinely in patients (3%–5% fluid deficit), moderate dehydration (6%–9% who have acute gastroenteritis. Authors of several studies fluid deficit), and severe dehydration (>10% fluid deficit have evaluated the utility of laboratory tests in assessing or shock). These classifications are similar to those delineated the degree of dehydration, and the evidence reveals that 488 Pediatrics in Review Vol.33 No.11 November 2012 Downloaded from http://pedsinreview.aappublications.org/ at Siu School Of Medicine on December 3, 2019 gastrointestinal disorders gastroenteritis Table 2. Symptoms Associated With Dehydration (1) Minimal or No Dehydration Mild to Moderate Dehydration Severe Dehydration Symptom (<3% Loss of Body Weight) (3%–9% Loss of Body Weight) (>9% Loss of Body Weight) Mental status Well; alert Normal, fatigued or restless, irritable Apathetic, lethargic, unconscious Thirst Drinks normally; might Thirsty; eager to drink Drinks poorly; unable to drink refuse liquids Heart rate Normal Normal to increased Tachycardia, with bradycardia in most severe cases Quality of Normal Normal to decreased Weak, thready, impalpable pulses Breathing Normal Normal; fast Deep Eyes Normal Slightly sunken Deeply sunken Tears Present Decreased Absent Mouth and Moist Dry Parched tongue Skin fold Instant recoil Recoil in <2 seconds Recoil in >2 seconds Capillary refill Normal Prolonged Prolonged; minimal Extremities Warm Cool Cold; mottled; cyanotic Urine output Normal to decreased Decreased Minimal such studies are imprecise and may distract clinicians from is the cornerstone of therapy in managing uncomplicated focusing on signs and symptoms that have proven diag- cases of diarrhea. nostic utility. Commonly obtained laboratory tests, such ORSs began to evolve in the 1940s, as an initiative
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