Pediatric Dehydration


Article Author:
Roy Vega


Article Editor:
Usha Avva


Editors In Chief:
Sherri Murrell


Managing Editors:
Avais Raja
Orawan Chaigasame
Khalid Alsayouri
Kyle Blair
Radia Jamil
Erin Hughes
Patrick Le
Anoosh Zafar Gondal
Saad Nazir
William Gossman
Hassam Zulfiqar
Navid Mahabadi
Hussain Sajjad
Steve Bhimji
Muhammad Hashmi
John Shell
Matthew Varacallo
Heba Mahdy
Ahmad Malik
Abbey Smiley
Sarosh Vaqar
Mark Pellegrini
James Hughes
Beenish Sohail
Hajira Basit
Phillip Hynes
Sandeep Sekhon


Updated:
2/3/2019 2:36:13 PM

Introduction

The World Health Organization defines dehydration as a condition that results from excessive loss of body water. The most common causes of dehydration in children are vomiting and diarrhea. 

Etiology

Infants and young children are particularly susceptible to diarrheal disease and dehydration. Reason include higher metabolic rate, inability to communicate their needs or hydrate themselves, and increased insensible losses. Other causes of dehydration may be the result of other disease processes resulting in fluid loss which includes: diabetic ketoacidosis (DKA), diabetes insipidus, burns, excessive sweating, and third spacing. Dehydration may also be the result of decreased intake along with ongoing losses. In addition to total body water losses, electrolyte abnormalities may exist. Infants and children have higher metabolic needs and that make them more susceptible to dehydration.[1]

Epidemiology

Dehydration is a major cause of morbidity and mortality in infants and young children worldwide.  Each year approximately 760,000 children of diarrheal disease worldwide. Most cases of dehydration in children are the consequence of acute gastroenteritis.

Acute gastroenteritis in the United States is usually infectious in etiology. Viral infections, including rotavirus, norovirus, and enteroviruses cause 75 to 90 percent of infectious diarrhea cases. Bacterial pathogens cause less than 20 percent of cases. Common bacterial causes include Salmonella, Shigella, and Escherichia coli. Approximately 10 percent of bacterial disease occurs secondary to diarrheagenic Escherichia coli. Parasites such as Giardia and Cryptosporidium account for less than 5 percent of cases.

Pathophysiology

Dehydration causes a decrease in total body water in both the intracellular and extracellular fluid volumes. Volume depletion closely correlates with the signs and symptoms of dehydration. The total body water (TBW) in humans is distributed in two major compartments. 2/3rd the of TBW is in the intracellular compartment and the other 1/3rd is distributed between interstitial space (75%) and plasma (25%). The total body water is higher in infants and children as compared to the adults. In infants, it is 70% of the total weight, whereas it is 65% and 60% respectively in children and adults. As indicated earlier dehydration is total water depletion with respect to the sodium and volume depletion is the decrease in the circulation volume. Volume depletion is seen in acute blood loss and burns, whereas distributive volume depletion is seen in sepsis and anaphylaxis. In much of the literature, the distinction between dehydration and volume depletion is a blur.

Metabolic acidosis is seen in infants and children with dehydration, the pathophysiology of which is multifactorial.

1. excess bicarbonate loss in the diarrhea stool or in the Urine is certain types of renal tubular acidosis

2. Ketosis secondary to the glycogen depletion seen in starvation which sets in infants and children much earlier when compared to adults.

3. Lactic acid production secondary to poor tissue perfusion

4. Hydrogen ion retention by the kidney from decreased renal perfusion and decreased glomerular filtration rate.

In children with pyloric stenosis have very unique electrolyte abnormalities from the excessive emesis of gastric contents. This is seen mostly in the older children. They loose chloride, sodium, potassium in addition to volume resulting in hypochloremic, hypokalemic metabolic alkalosis. Kidney excretes base in the form of Hco3 ion to maintain acid-base balance of loss of Hydrogen ion in the emesis in the form of hydrogen chloride. It is interesting to note that kidney also excretes hydrogen ion to save sodium and water, which could be the reason for aciduria. Recently published article has shown that many children with pyloric stenosis may not have metabolic alkalosis.

History and Physical

Various sign and symptoms can be present depending on the patient's degree of dehydration. Dehydration is categorized as mild (3% to 5%), moderate (6% to 10%), and severe ( more than 10%). The table below can assist with categorizing the patient's degree of dehydration. The degree of dehydration between an older child and infant are slightly different as the infant could have total body water (TBW) content of 70%-80% of the body weight and older children have TBW of 60% of the body weight. An infant has to lose more body weight than the older child to get to the same level of dehydration.[2]

Dehydration%   Mild 3% to 5%  Moderate 6% to 10%  Severe >10%

Mental status         Normal         Listless, irritable     Altered mental

Heart rate              Normal         Increased              Increased

Pulses                    Normal        Decreased              Thready

Capillary refill         Normal        Prolonged               Prolonged

Blood pressure       Normal         Normal                  Decreased

Respirations           Normal        Tachypnea             Tachypnea

Eyes                      Normal        Slightly sunken       Fewer tears

Fontanelle              Normal        Sunken                  Sunken

Urine output           Normal        Decreased              Oliguric

(see image below)

Evaluation

Dehydration could be associated with hypo or hyper or isonatremia. Most cases of dehydration are hyponatremic. In selected cases, electrolyte abnormalities may exist. This includes derangements in sodium levels, acidosis characterized by low bicarbonate levels or elevated lactate levels. For patients with vomiting, who have not been able to tolerate oral fluids hypoglycemia may be present. Evaluation of urine specific gravity and the presence of ketones can assist in the evaluation of dehydration.[3]

Children who were given free water when they have ongoing diarrhea disease can present with hyponatremic dehydration, the excess of free water concurrent to excess sodium and bicarbonate loss in diarrhea. This is also seen in the syndrome of inappropriate secretion of antidiuretic hormone (SIADH). In these cases, the children appear to be more dehydrated and could also present with hyponatremic seizure activity.

Similarly, infants who are fed oral rehydration solution prepared from excess salt or who lost excess free water as in diabetes incipidus could have hypernatraemic dehydration

End-tidal carbon dioxide measurements have been studied in an attempt to assess degrees of dehydration greater than five percent in children. This non-invasive approach has promise, but as of now has not proven to be an effective tool in determining the degree of dehydration in children. [4]

Treatment / Management

Priorities in the management of dehydration include early recognition of symptoms, identifying the degree of dehydration, stabilization, and rehydration strategies.

Symptoms include vomiting, diarrhea, fever, decreased oral intake, inability to keep up with ongoing losses, decreased urine output, progressing to lethargy, and hypovolemic shock.

Mild Dehydration

The American Academy of Pediatrics recommends oral rehydration for patients with mild dehydration. Breastfed infants should continue to nurse. Fluids with high sugar content may worsen diarrhea and should be avoided. Children can be fed age-appropriate foods frequently but in small amounts.

Moderate Dehydration

The Morbidity and Mortality Weekly Report recommends administering 50 mL to 100 mL of oral rehydration solutions per kilogram per body weight during two to four hours to replace the estimated fluid deficit, with additional oral rehydration solution, administered to replace ongoing losses.

Severe Dehydration

For patients who are severely dehydrated, rapid restorations of fluids are required.

Patients who are severely dehydrated can present with altered mental status, lethargy, tachycardia, hypotension, signs of poor perfusion, weak thread pulses, and delayed capillary refill.

Intravenous fluids, starting with 20 ml/kg boluses of normal saline are required. Multiple boluses may be needed for children in hypovolemic shock. Additional priorities include obtaining a point of care glucose test, electrolytes, and urinalysis assessing for elevated specific gravity and ketones. [5]

Hypoglycemia should be assessed at the point of care testing via glucometer, and venous blood gas with electrolytes or serum chemistries. It should be treated with intravenous glucose. The dose is 0.5 gm/km to 1 gm/km. This translates to 5 ml/kg to 10 ml/kg of D10, 2ml/kg to  4 ml/kg of D25, or 1 ml/kg to- 2 ml/kg of D50. The use of D50 is usually reserved for an adolescent or adult-sized patients using a large bore intravenous line.[6]

Replacement of Fluids

An assessment of the degree of dehydration will determine the fluid replacement. Using tables that can predict the degree of dehydration is helpful. If a previous "well weight" is available, that can be subtracted from the patient's "sick weight" to calculate total weight loss. One kilogram weight loss equates to one liter of fluid lost.

The rate of replacement is based on the severity of the dehydration. Patients with hypovolemic shock need rapid boluses of isotonic fluid either normal saline or ringer lactate at 20ml/kg body weight. This could be repeated 3 times with reassessment in-between the boluses. Ringer lactate is superior to normal saline in hemorrhagic shock requiring rapid resuscitation with isotonic fluids.[7] This difference is not found in the children with severe dehydration from acute diarrheal disease. In these children, the replacement with normal saline and ringer lactate did show similar clinical improvement.[8]

Rapid infusion can cause cardiac insufficiency, congestive heart failure, and pulmonary edema. Rapid correction in patients with diabetic ketoacidosis can cause cerebral edema in adolescent and children.

The rate of replacement fluids is calculated after taking into account for the maintenance, replacement and deficit requirement of the patient. Sodium requirements of the children in the hospital are higher than that of the adults. The children have high metabolic needs, has higher insensible lose as they have a higher body surface area. They also have higher respiratory and heart rates, requiring the use of an intravenous solution containing high sodium like D5NS. The deficit is determined by the degree of dehydration as outlined earlier. The second phase of fluid replacement therapy lasts for 8 hours, during which the child requires 1/2 of the remaining deficit in addition 1/3rd of the maintenance fluid. The remaining half of the deficit and the 2/3rd of the daily maintenance therapy is given during the third phase of the therapy which spans the following 16 hours.

Holliday-Segar calculation is used for calculation of maintenance fluid in children, which is 100ml/kg/day for first 10 kg body weight (BW), then 50 ml/kg/day for the next 10 kg BW and then 20 ml/kg /day for any BW over and above.[9]

For patients where intravenous access can not be achieved or maintained, other methods can be employed. They include continuous nasogastric hydration and subcutaneous hydration.[10]]

Hypodermoclysis refers to hydrating the subcutaneous space with fluid which can be absorbed systemically. Hypodermoclysis is best reserved for the stable child or infant with mild to moderate dehydration who either fails a trial of fluids by mouth or who needs some degree of rehydration to facilitate gaining intravenous access after a slow subcutaneous fluid bolus has been given.

The process begins with:

The placement of topical anesthetic cream, such as EMLA, cover with an occlusive dressing, wait for 15 to 20 minutes.“Pinch an inch” of skin anywhere, but the most practical site for young children is between the scapulae.Insert a 25-gauge butterfly needle or 24-gauge angiocatheterInject 150 units hyaluronidase SC (if available).Infuse 20 mL/kg isotonic solution over one hour, repeat as needed or use this technique as a bridge to intravenous access.

Pearls and Other Issues

Once the patient’s condition has stabilized, hydration therapy continues to replace existing and ongoing losses. Fluid therapy should include maintenance fluids plus replacement of the existing fluid deficit.

Deficit calculation can be determined in several ways. If the patient's weight before the illness is known, it can be subtracted from the current weight. Each kilogram lost would be equivalent to one liter of fluid lost. If the prior weight is not known, multiply the weight in kilograms by the dehydration percent.

For a 10 kg patient who is 10% dehydrated, 0.1 represents 10%

  • (10 kg) x (.10) = 1 kilogram

Maintenance fluids can be calculated as follows:

For a patient weighing less than 10 kg, they should receive 100 mL/kg/day.

If the patient weighs less than 20 kg, fluids will include the 1000 mL/day plus 50 mL/kg/day for each kilogram between 10 kg and 20 kg.

For patients weighing more than 20 kg, give 1500 mL/day, plus 20 mL/kg/day for each kilogram over 20 kg. Divide the total by 24 to determine the hourly rate.

In hyponatremic dehydration, half of the deficit can be replaced over eight hours with the remaining half the following sixteen hours. Severe hyponatremia (< 130 mEq/L) or hypernatremic dehydration (> 150 mEq/L) is corrected over 24 to 48 hours. Symptomatic hyponatremia (seizures, lethargy) can be acutely managed with hypertonic saline (3% sodium chloride). The deficit may be calculated to restore the sodium to 130 mEq/L and administered over 48 hours, as follows:

Sodium deficit = (sodium desired - sodium actual) x volume of distribution x weight (kg))

Example: Sodium = 123, weight = 10 kg, assumed volume of distribution of 0.6; Sodium deficit = (130-123) X 0.6 X 10 kg = 42 mEq sodium. Hypertonic saline (3%) which contains 0.5 mEq/mL may be used for rapid partial correction of symptomatic hyponatremia. A bolus dose of 4 mL/kg raises the serum sodium by 3 mEq/L to 4 mEq/L.

Rapid correction of hypernatremia may result in cerebral edema, as a result of intracellular swelling occurs. Osmotic demyelination syndrome, also known as central pontine myelinolytic, can occur as a result of rapid correction of hyponatremia. Symptoms include a headache, confusion, altered consciousness, gait disturbance, and may lead to respiratory arrest.

Enhancing Healthcare Team Outcomes

Diarrheal diseases and resulting severe dehydration are the leading cause of infant mortality worldwide especially in children < 5years of age.[11]. This burden is even higher among children in developing countries. To improve the outcome and decrease the morbidity and mortality from the diarrhea diseases especially Rotaviral disease which is the leading cause of death in children we need cooperation between various different agencies and countries.

World health organization while working with member countries and other agencies promotes national policies and investments to have access to safe drinking water, to improve sanitation, to research in diarrhea prevention like vaccination, to implement preventive measures like  source water treatments, safe storage and to help train the health care workers who could go into communities to bring the change at local level. 


  • Image 5622 Not availableImage 5622 Not available
    Contributed by Roy M. Vega MD
Attributed To: Contributed by Roy M. Vega MD

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Pediatric Dehydration - Questions

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Which is a potential consequence of prolonged diarrhea?



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A 12-month-old is brought to the emergency department with a 2-day history of repeated episodes of emesis. Today the child has foul-smelling, watery diarrhea. The diapers always have stool, so the mother is not sure when the child last urinated. The mucosa is dry, there are no tears when the child cries, and the child is listless. Vital signs show a temperature of 39.2 C, a heart rate of 175 beats per minute, a respiratory rate of 45 breaths per minute, and a blood pressure of 78/45 mm Hg. The child's weight is 7 kg. There is no focal sign of infection found on the exam. What is the most appropriate initial management?



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In a child who is dehydrated, what change will be seen in the urine specific gravity?



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Which of the following is the best intravenous fluid for dehydration in children?



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Which of the following is the best method of rehydration in a severely malnourished child with dehydration for 6 weeks?



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A patient with serum hyperosmolarity should be treated with which of the following?



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Why do infants tend to be severely affected by fluid loss?



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What physical finding is a sensitive indicator of early volume depletion in a pediatric patient?



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Which of the following is strong, objective evidence of volume loss in children?



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Which of the following is the best solution for intravenous treatment of severe dehydration in children?



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Which of the following is the best method of rehydration of severely malnourished children with dehydration?



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Which of the following conditions would cause a rise in serum osmolality?



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A 16-month-old has had vomiting and diarrhea for a week. His mother has given him sugar water, rice, and salt. The child is irritable and lethargic, and the muscles feel doughy. What lab value is consistent with this condition?



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A 17-year-old female marathon runner is brought to the emergency department after a 25 k event. She is lightheaded and disoriented. Her normal weight is 47 kg. Her vital signs show a heart rate of 120 bpm, blood pressure 82/60 mmHg, and temperature 38.1 C. The patient's skin turgor is poor and serum sodium is 170 meq/L. What is her estimated free water deficit?



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A 17-year-old is light-headed after running but is not drinking any fluids. The patient is orthostatic but afebrile. Mental status in normal. Which lab value is least probable?



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An infant presents with a pulse of 180, respiratory rate of 35 and a tachyarrhythmia after 24 hours of poor feeding and vomiting with diarrhea. What is the primary problem?



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A 22 pound pediatric patient presents with gastroenteritis and needs fluid replacement. What is the first step in management?



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What is the best management for a moderately dehydrated child?



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What is the best management of a severely dehydrated child?



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A 17-year-old male becomes disoriented and extremely fatigued during his first marathon at 18 miles. The weather is 82F with 80% humidity. The patient complains of a dry mouth and lightheadedness. What is the most likely cause of his condition?



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Which of the following usually is not successful in the treatment of dehydration in pediatric patients?



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Which is true regarding dehydration in children?



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A 1-year-old infant has had diarrhea for 3 days. She is alert and awake with tachycardia, depressed fontanelle, decreased skin turgor, and sunken eyes. What is the estimated dehydration?



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An 18-month-old infant is brought to the emergency room after one day of vomiting and diarrhea. The patient has had watery diarrhea without blood or fevers. On exam, the infant is afebrile and tachycardic, but the blood pressure is normal. Mucous membranes are dry, skin turgor is decreased, and pulses are good. The child is alert but fussy. Select the most appropriate initial management.



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Pediatric Dehydration - References

References

Tutay GJ,Capraro G,Spirko B,Garb J,Smithline H, Electrolyte profile of pediatric patients with hypertrophic pyloric stenosis. Pediatric emergency care. 2013 Apr     [PubMed]
Falszewska A,Szajewska H,Dziechciarz P, Diagnostic accuracy of three clinical dehydration scales: a systematic review. Archives of disease in childhood. 2018 Apr     [PubMed]
Martini WZ,Cortez DS,Dubick MA, Comparisons of normal saline and lactated Ringer's resuscitation on hemodynamics, metabolic responses, and coagulation in pigs after severe hemorrhagic shock. Scandinavian journal of trauma, resuscitation and emergency medicine. 2013 Dec 11     [PubMed]
Meyers RS, Pediatric fluid and electrolyte therapy. The journal of pediatric pharmacology and therapeutics : JPPT : the official journal of PPAG. 2009 Oct     [PubMed]
Estimates of global, regional, and national morbidity, mortality, and aetiologies of diarrhoeal diseases: a systematic analysis for the Global Burden of Disease Study 2015. The Lancet. Infectious diseases. 2017 Sep     [PubMed]
Vega RM,Avner JR, A prospective study of the usefulness of clinical and laboratory parameters for predicting percentage of dehydration in children. Pediatric emergency care. 1997 Jun     [PubMed]
Freedman SB,Johnson DW,Nettel-Aguirre A,Mikrogianakis A,Williamson-Urquhart S,Monfries N,Cheng A, Assessing Dehydration Employing End-Tidal Carbon Dioxide in Children With Vomiting and Diarrhea. Pediatric emergency care. 2018 Aug     [PubMed]
Geurts D,Steyerberg EW,Moll H,Oostenbrink R, How to Predict Oral Rehydration Failure in Children With Gastroenteritis. Journal of pediatric gastroenterology and nutrition. 2017 Nov     [PubMed]
Sendarrubias M,Carrón M,Molina JC,Pérez MÁ,Marañón R,Mora A, Clinical Impact of Rapid Intravenous Rehydration With Dextrose Serum in Children With Acute Gastroenteritis. Pediatric emergency care. 2018 Dec     [PubMed]
Kartha GB,Rameshkumar R,Mahadevan S, Randomized Double-blind Trial of Ringer Lactate Versus Normal Saline in Pediatric Acute Severe Diarrheal Dehydration. Journal of pediatric gastroenterology and nutrition. 2017 Dec     [PubMed]
Rébeillé-Borgella B,Barbier C,Moussaoui R,Faisant A,Michard-Lenoir AP,Rubio A, [Nasogastric rehydration for treating children with gastroenteritis]. Archives de pediatrie : organe officiel de la Societe francaise de pediatrie. 2017 Jun     [PubMed]
Yang HW,Jeon W,Min YG,Lee JS, Usefulness of end-tidal carbon dioxide as an indicator of dehydration in pediatric emergency departments: A retrospective observational study. Medicine. 2017 Sep;     [PubMed]

Disclaimer

The intent of StatPearls is to provide practice questions and explanations to assist you in identifying and resolving knowledge deficits. These questions and explanations are not intended to be a source of the knowledge base of all of medicine, nor is it intended to be a board or certification review of Nurse-Elder Adult Care. The authors or editors do not warrant the information is complete or accurate. The reader is encouraged to verify each answer and explanation in several references. All drug indications and dosages should be verified before administration.

StatPearls offers the most comprehensive database of free multiple-choice questions with explanations and short review chapters ever developed. This system helps physicians, medical students, dentists, nurses, pharmacists, and allied health professionals identify education deficits and learn new concepts. StatPearls is not a board or certification review system for Nurse-Elder Adult Care, it is a learning system that you can use to help improve your knowledge base of medicine for life-long learning. StatPearls will help you identify your weaknesses so that when you are ready to study for a board or certification exam in Nurse-Elder Adult Care, you will already be prepared.

Our content is updated continuously through a multi-step peer review process that will help you be prepared and review for a thorough knowledge of Nurse-Elder Adult Care. When it is time for the Nurse-Elder Adult Care board and certification exam, you will already be ready. Besides online study quizzes, we also publish our peer-reviewed content in eBooks and mobile Apps. We also offer inexpensive CME/CE, so our content can be used to attain education credits while you study Nurse-Elder Adult Care.