dehydration

(noun)

In physiology and medicine, dehydration (hypohydration) is defined as the excessive loss of body fluid.

Related Terms

  • muscle pull
  • osmoreceptors
  • thirst
  • electrolyte

Examples of dehydration in the following topics:

  • Water Balance Disorders

    • In physiology and medicine, dehydration (hypohydration) is defined as the excessive loss of body fluid.
    • Much of the physiological effects of dehydration is due to the changes in ion concentration that may occur as a result of the dehydration.
    • Hypotonic dehydration causes decreased plasma osmolarity, while hypertonic dehydration will cause increased plasma osmolarity.
    • Isotonic dehydration is the most common type of dehydration.
    • Intravenous administration of fluid is one effective treatment of dehydration in humans.
  • Sodium, Electrolytes, and Fluid Balance

    • Chronic laxative abuse or severe diarrhea or vomiting (gastroenteritis) can lead to electrolyte disturbances along with dehydration.
    • In humans, the most common type of dehydration by far is isotonic (isonatraemic) dehydration which effectively equates with hypovolemia; but the distinction of isotonic from hypotonic or hypertonic dehydration may be important when treating people with dehydration.
    • In hypotonic dehydration, intravascular water shifts to the extravascular space, exaggerating intravascular volume depletion for a given amount of total body water loss.
    • In more severe cases, correction of a dehydrated state is accomplished by the replenishment of necessary water and electrolytes (through oral rehydration therapy or fluid replacement by intravenous therapy).
    • As oral rehydration is less painful, less invasive, less expensive, and easier to provide, it is the treatment of choice for mild dehydration.
  • Pylorospasm and Pyloric Stenosis

    • Dehydration also can occur causing the infant to cry without having tears, and having less wet or dirty diapers (hours up to a couple days without a dirty/wet diaper).
    • The danger of pyloric stenosis comes from the dehydration and electrolyte disturbance rather than the underlying problem itself.
    • Therefore, the baby must be initially stabilized by correcting the dehydration and hypochloremic alkalosis with IV fluids.
  • Pancreatitis

    • Early complications of pancreatitis include shock, infection, systemic inflammatory response syndrome, low blood calcium, high blood glucose, and dehydration.
    • Blood loss, dehydration, and fluid leaking into the abdominal cavity can lead to kidney failure.
  • Glucosuria

    • Glycosuria leads to excessive water loss into the urine with resultant dehydration, a process called osmotic diuresis.
  • Alkalosis

    • Severe dehydration and the consumption of alkali are other causes.
  • Aging and the Urinary System

    • Dehydration can occur if an older person reduces fluid intake in an attempt to reduce bladder control problems.
  • Tissues and Aging

    • A compromised sense of thirst as a consequence of aging led these elderly people to be severely dehydrated.
    • Because water balance is altered and the sensation of thirst diminishes with age, older people are more susceptible to dehydration.
  • Fluids and Aging

    • In adults over the age of 50 years, the body's thirst sensation reduces and continues diminishing with age, putting this population at increased risk of dehydration.
  • Adrenal Gland Disorders

    • Symptoms include hypoglycemia, dehydration, weight loss, and disorientation.
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