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Health Encylopedia

 
Dehydration
 
SubjectContents
Definition Dehydration means the body does not have enough fluids to function at an optimal level. Dehydration can be caused by fluid loss (through vomiting, diarrhea or excessive urination), inadequate intake, or a combination of both. The most common cause of dehydration in infants and children is acute gastroenteritis , with its associated vomiting and diarrhea. Dehydration is classified as mild, moderate, or severe based on the percentage of body weight lost during the acute illness: Depending on age,
  • Mild dehydration
  • -- a loss of 3-5% of body weight
  • Moderate dehydration
  • -- a loss of 6-10% of body weight
  • Severe dehydration
  • -- a loss of more than 9-15% of body weight. This is a life-threatening emergency!
    Alternative Names 
    Causes, incidence, and risk factors Because of their smaller body weights and higher turnover rates for water and electrolytes, infants and children are more susceptible to dehydration than adults. Causes of dehydration include excessive fluid losses, inadequate fluid intake, or a combination of these factors. Causes of acute fluid loss include:
  • vomiting
  • diarrhea
  • (especially well recognized in
  • cholera )
  • excessive urine output (
  • polyuria ) such as with uncontrolled diabetes
  • sweating, excessive
  • fever
  • Dehydration can also occur from inadequate intake as in:
  • nausea
  • refusing to drink because of mouth sores (
  • stomatitis ) or a sore throat ( pharyngitis )
  • acute
  • illness with
  • loss of appetite Dehydration in children is most often a combination of both as in:
  • gastroenteritis with vomiting and diarrhea
  • acute illness where the child refuses fluids and loses excessive fluid through
  • sweating with fever
    Symptoms
  • excessive loss of fluid through
  • vomiting , urinating, stools or sweating
  • poor intake of fluids, "can't keep anything down"
  • sunken eyes
  • markedly sunken fontanelles in an infant
  • dry or sticky mucous membranes in the mouth
  • the skin may lack its normal elasticity and sag back into position slowly when pinched up into a fold (
  • poor skin turgor )
  • decreased or absent urine output (
  • oliguria or anuria)
  • decreased tears
  • deep and rapid breathing
  • with severe dehydration -- lethargic or comatose
  • Signs and tests A physical examination may also show signs of:
  • low blood pressure
  • (hypotension)
  • rapid heart rate
  • (tachycardia)
  • delayed capillary refill
  • shock
  • Tests include:
  • blood chemistries
  • (to check
  • electrolytes , especially sodium, potassium, and bicarbonate levels)
  • urine specific gravity
  • (a high specific gravity indicates significant dehydration)
  • BUN
  • (blood urea nitrogen -- may be elevated with dehydration)
  • creatinine
  • (creatinine -- may be elevated with dehydration)
  • Complete Blood Count (CBC) to look for signs of concentrated blood (hemoconcentration)
  • Other tests may be done to determine the specific cause of the dehydration (for example, a blood sugar to check for diabetes ).
    Treatment Drinking fluids is often sufficient for mild dehydration. It is better to encourage frequent, small amounts of fluid (using a teaspoon or syringe) rather than forcing a child to drink a large amount of fluid at one time. Intravenous fluids and hospitalization may be necessary for moderate to severe dehydration. The health care provider must also determine and, if possible, treat the cause of the dehydration. The great majority of cases of acute gastroenteritis are caused by viruses. They tend to be self-limited, resolving on their own after a few days.
    Support Groups 
    Expectations (prognosis) When dehydration is recognized and treated promptly, the outcome is generally good.
    Complications Untreated severe dehydration may result in seizures , permanent brain damage, or death.
    Calling your health care provider Call your health care provider if you suspect dehydration. Remember that a child can quickly become severely dehydrated.
    Prevention It is important to carefully monitor hydration status any time an infant or child is ill. If you believe that dehydration is developing, consult a health care provider before the child becomes moderately or severely dehydrated. A few simple measures may prevent the development of severe dehydration. Always encourage fluids during an illness, and remember that fluid needs are increased with fever, vomiting, and diarrhea. The easiest signs to monitor are urine output (there should be frequent wet diapers or trips to the bathroom), saliva in the mouth, and tears with crying. Avoid using water as the primary replacement fluid, especially in infants. Specific solutions (such as Pedialyte) are available that provide the right amount of electrolytes to prevent electrolyte abnormalities.