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14-September-2008 18:02:39 - Dehydration This article is about the medical condition. For the removal of water through chemical or physical means, see desiccation. For the chemical reaction, see dehydration reaction. For food preservation by dehydration, see drying food. Dehydration Classification and external resources ICD-10 E86. ICD-9 276.5 Dehydration hypohydration is the removal of water hydro in ancient Greek from an object. In physiological terms, it entails a relative deficiency of water molecules in relation to other dissolved solutes. Dehydration, thus, is slightly different from hypovolemia, which defines water deficiency only in terms of overall volume rather than in terms of solute concentrations. Contents 1 Medical causes of dehydration in humans 2 Symptoms and prognosis 3 Treatment 4 Avoiding dehydration 5 See also 6 References 7 Notes 8 External links Medical causes of dehydration in humans In humans, dehydration can be caused by a wide range of diseases and states that impair water homeostasis in the body. These include: External or stress-related causes Prolonged physical activity without consuming adequate water, especially in a hot and/or humid environment Prolonged exposure to dry air, e.g. in high-flying airplanes 5-15% relative humidity Survival situations, especially desert conditions Blood loss or hypotension due to physical trauma Diarrhea Hyperthermia Shock hypovolemic Vomiting Burns Lacrimation Use of Methamphetamine and other stimulants. Drinking of Alcohol. Infectious diseases Cholera Gastroenteritis Shigellosis Yellow fever Malnutrition Electrolyte disturbance Hypernatremia also caused by dehydration Hyponatremia, especially from restricted salt diets Fasting Recent rapid weight loss may reflect progressive depletion of fluid volume the loss of 1 L of fluid results in a weight loss of 1 kg or 2.2 lb.1 Patient refusal of nutrition and hydration Other causes of obligate water loss Severe hyperglycemia, especially in Diabetes mellitus Glycosuria Symptoms and prognosis Symptoms may include headaches similar to what is experienced during a hangover, muscle cramps, a sudden episode of visual snow, decreased blood pressure hypotension, and dizziness or fainting when standing up due to orthostatic hypotension. Untreated dehydration generally results in delirium, unconsciousness, swelling of the tongue1 and in extreme cases death. Dehydration symptoms generally become noticeable after 2% of one's normal water volume has been lost. Initially, one experiences thirst and discomfort, possibly along with loss of appetite and dry skin. This can be followed by constipation. Athletes may suffer a loss of performance of up to 30%2, and experience flushing, low endurance, rapid heart rates, elevated body temperatures, and rapid onset of fatigue. Symptoms of mild dehydration include thirst, decreased urine volume, abnormally dark urine, unexplained tiredness, irritability, lack of tears when crying, headache, dry mouth, dizziness when standing due to orthostatic hypotension, and in some cases can cause insomnia. In moderate to severe dehydration, there may be no urine output at all. Other symptoms in these states include lethargy or extreme sleepiness, seizures, sunken fontanel soft spot in infants, fainting, and sunken eyes. The symptoms become increasingly severe with greater water loss. One's heart and respiration rates begin to increase to compensate for decreased plasma volume and blood pressure, while body temperature may rise because of decreased sweating. Around 5% to 6% water loss, one may become groggy or sleepy, experience headaches or nausea, and may feel tingling in one's limbs paresthesia. With 10% to 15% fluid loss, muscles may become spastic, skin may shrivel and wrinkle, vision may dim, urination will be greatly reduced and may become painful, and delirium may begin. Losses greater than 15% are usually fatal. 3 For adults over age 50, the body's thirst sensation diminishes and continues diminishing with age. Many senior citizens suffer symptoms of dehydration. Dehydration along with hyperthermia results in seniors dying during extreme hot weather. Dehydration is the excessive loss of water from the body. Diseases of the gastrointestinal tract can lead to dehydration in various ways. Often, dehydration becomes the major problem in an otherwise self-limited illness. Fluid loss may even be severe enough to become life-threatening. Treatment Nurses encourage a patient to drink an Oral Rehydration Solution to improve dehydration he acquired from cholera. Nurses encourage a patient to drink an Oral Rehydration Solution to improve dehydration he acquired from cholera. The best treatment for minor dehydration is drinking water and stopping fluid loss. Water is preferable to sport drinks and other commercially-sold rehydration fluids, as the balance of electrolytes they provide may not match the replacement requirements of the individual.citation needed To stop fluid loss from vomiting and diarrhea, avoid solid foods and drink only clear liquids. In some cases, eating of salted foods may have a positive impact on the person. However, eating salted foods should come with more intake of a clear liquid. It is wise to slowly drink liquids when dehydrated. 4 In more severe cases, correction of a dehydrated state is accomplished by the replenishment of necessary water and electrolytes rehydration, through oral rehydration therapy or intravenous therapy. Even in the case of serious lack of fresh water e.g., at sea or in a desert, drinking seawater or urine does not help, nor does the consumption of alcohol. It is often thought that the sudden influx of salt into the body from seawater will cause the cells to dehydrate and the kidneys to overload and shut down but it has been calculated that an average adult can drink up to 0.2 liters of seawater per day before the kidneys start to fail.citation needed When dehydrated, unnecessary sweating should be avoided, as it wastes water. If there is only dry food, it is better not to eat, as water is necessary for digestion. 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 attention is required. Fluids containing a proper balance of replacement electrolytes are given orally or intravenously with continuing assessment of electrolyte status; complete resolution is the norm in all but the most extreme cases. Avoiding dehydration Dehydration is best avoided by drinking plenty of water. The greater the amount of water lost through perspiration, the more water must be consumed to replace it and avoid dehydration. Since the body cannot tolerate large deficits or excesses in total body water, consumption of water must be roughly concurrent with the loss in other words, if one is perspiring, one should also be drinking water frequently. Drinking water beyond the needs of the body entails little risk, since the kidneys will efficiently remove any excess water through the urine with a large margin of safety. A person's body, during an average day in a temperate climate such as the United Kingdom, loses approximately 2.5 litres of water. This can be through the lungs as water vapor, through the skin as sweat, or through the kidneys as urine. Some water a less significant amount, in the absence of diarrhea is also lost through the bowels. In warm or humid weather or during heavy exertion, however, the water loss can increase by an order of magnitude or more through perspiration; all of which must be promptly replaced. In extreme cases, the losses may be great enough to exceed the body's ability to absorb water from the gastrointestinal tract; in these cases, it is not possible to drink enough water to stay hydrated, and the only way to avoid dehydration is to reduce perspiration through rest, a move to a cooler environment, etc.. A useful rule of thumb for avoiding dehydration in hot or humid environments or during strenuous activity involves monitoring the frequency and character of urination. If one develops a full bladder at least every 3-5 hours and the urine is only lightly colored or colorless, chances are that dehydration is not occurring; if urine is deeply colored, or urination occurs only after many hours or not at all, water intake may not be adequate to maintain proper hydration. When large amounts of water are being lost through perspiration and concurrently replaced by drinking, maintaining proper electrolyte balance becomes an issue. Drinking fluids that are hypertonic or hypotonic with respect to perspiration may have grave consequences hyponatremia or hypernatremia, principally as the total volume of water turnover increases. If water is being lost through abnormal mechanisms such as vomiting or diarrhea, an imbalance can develop very quickly into a medical emergency. In fact, the main mechanisms through which diseases such as infantile diarrhea and cholera kill their victims are dehydration and loss of electrolytes. During sports events such as marathons, water stops and water breaks are provided to avoid dehydration of athletes. See also Hypovolemia, a depletion of blood volume that can be caused by dehydration Safe water Water intoxication Water therapy Water deprivation test References Ira R. Byock, M.D., Patient Refusal of Nutrition and Hydration: Walking the Ever-Finer Line. American Journal Hospice Palliative Care, pp. 8-13. March/April 1995 Notes ^ Dehydration Symptoms - Benefits of Drinking Water - Signs of Fluid Imbalance ^ Bean, Anita 2006. The Complete Guide to Sports Nutrition. A C Black Publishers Ltd., pp. 81-83. ISBN 0713675586. ^ http://faculty.washington.edu/kepeter/118/notes/pdf-set5/118water-bal-06.htm ^ Healthwise Handbook, Healthwise, Inc. 1999 External links Look up Dehydration in Wiktionary, the free dictionary. Water requirements in adults Definition of dehydration by the U.S. National Institutes of Health's MedlinePlus medical encyclopedia Rehydration Project at rehydrate.org v d e Water-electrolyte imbalance and acid-base imbalance E86-E87, 276 Volume status Dehydration/Hypervolemia - Hypovolemia Electrolyte Na+ Hypernatremia/Hyponatremia K+ Hyperkalemia/Hypokalemia Cl- Hyperchloremia/Hypochloremia Acid-base Acidosis: Metabolic - Respiratory - Lactic - Ketosis Alkalosis: Metabolic, Respiratory Mixed disorder of acid-base balance Retrieved from http://en..org/wiki/Dehydration Categories: Metabolic disorders | Electrolyte disturbances | Nutrition | Causes of deathHidden categories: All articles with statements | Articles with statements since February 2008 | Articles with statements since February 2007 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Català Česky Dansk Deutsch Español Français Bahasa Indonesia Italiano עברית Lietuvių Magyar Nederlands 日本語 ‪Norsk bokmÃ¥l‬ Polski Português РуÑ?Ñ?кий Simple English SlovenÄ?ina Suomi Svenska ä¸æ–‡ This page was last modified on 13 September 2008, at 09:08
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