Dehydration

In physiology and medicine, dehydration (hypohydration) is defined as the excessive loss of body water, with an accompanying disruption of metabolic processes. It is literally the removal of water (Ancient Greek: ὕδωρ hýdōr) from an object; however, in physiological terms, it entails a deficiency of fluid within an organism. Dehydration of skin and mucous membranes can be called medical dryness.

There are three types of dehydration: hypotonic or hyponatremic (primarily a loss of electrolytes, sodium in particular), hypertonic or hypernatremic (primarily a loss of water), and isotonic or isonatremic (equal loss of water and electrolytes).

In humans, the most commonly seen 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 who become dehydrated. Physiologically, dehydration, despite the name, does not simply mean loss of water, as water and solutes (mainly sodium) are usually lost in roughly equal quantities to how they exist in blood plasma. In hypotonic dehydration, intravascular water shifts to the extravascular space, exaggerating intravascular volume depletion for a given amount of total body water loss. Neurological complications can occur in hypotonic and hypertonic states. The former can lead to seizures, while the latter can lead to osmotic cerebral edema upon rapid rehydration.

Read more about Dehydration:  Definition, Signs and Symptoms, Differential Diagnosis, Prevention, Treatment

Other articles related to "dehydration":

Dehydration Reactions
... In organic synthesis, there are many examples of dehydration reactions for example dehydration of alcohols or sugars ... center Dehydration reactions Reaction Equation Conversion of alcohols to ethers 2 R-OH → R-O-R + H2O Conversion of alcohols to alkenes R-CH2-CHOH-R → R-CH=CH-R ...
Tentative Wound - Dehydration
... Death from dehydration can take from several days to a few weeks ... Those who die by terminal dehydration typically lapse into unconsciousness before death, and may also experience delirium and deranged serum sodium ... Patients with edema tend to take longer to die of dehydration because of the excess fluid in their bodies ...
American Football/to Do - Physicality - Nutrition and Dehydration
... with the dangerous combination of warm weather and high humidity, dehydration is a great risk for the players ... important for players to drink enough fluids because dehydration can seriously reduce athletic performance and increase the risk of heat illnesses ...
Chemical Derivatives Of Ethanol - Reactions - Dehydration
... Strong acid desiccants cause the dehydration of ethanol to form diethyl ether and other byproducts ... If the dehydration temperature exceeds around 160 °C, ethylene will be the main product ...
Dehydration - Treatment
... The treatment for minor dehydration often considered the most effective, is drinking water and stopping fluid loss ... expensive, and easier to provide, it is the treatment of choice for mild dehydration ... For severe cases of dehydration where fainting, unconsciousness, or other severely inhibiting symptom is present (the patient is incapable of standing or thinking clearly), emergency ...