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Hypovolemia, also known as volume depletion or volume contraction, is a state of abnormally low extracellular fluid in the body. [1] This may be due to either a loss of both salt and water or a decrease in blood volume. [2] [3] Hypovolemia refers to the loss of extracellular fluid and should not be confused with dehydration. [4]
Volume contraction is a decrease in the volume of body fluid, including the dissolved substances that maintain osmotic balance . The loss of the water component of body fluid is specifically termed dehydration .
Euvolemia is the state of normal body fluid volume, including blood volume, interstitial fluid volume, and intracellular fluid volume; hypovolemia and hypervolemia are imbalances. Water is necessary for all life on Earth. Humans can survive for 4 to 6 weeks without food but only for a few days without water.
Hypovolemic shock is a form of shock caused by severe hypovolemia (insufficient blood volume or extracellular fluid in the body). [ 1 ] [ 2 ] It can be caused by severe dehydration or blood loss . [ 3 ] [ 2 ] Hypovolemic shock is a medical emergency ; if left untreated, the insufficient blood flow can cause damage to organs , leading to ...
The causes of hyponatremia are typically classified by a person's body fluid status into low volume, normal volume, or high volume. [4] Low volume hyponatremia can occur from diarrhea, vomiting, diuretics, and sweating. [4] Normal volume hyponatremia is divided into cases with dilute urine and concentrated urine. [4]
Hypoosmolar hyponatremia is a condition where hyponatremia is associated with a low plasma osmolality. [1] The term "hypotonic hyponatremia" is also sometimes used.[2]When the plasma osmolarity is low, the extracellular fluid volume status may be in one of three states: low volume, normal volume, or high volume.
If the levels of an electrolyte are too low, a common response to electrolyte imbalance may be to prescribe supplementation. However, if the electrolyte involved is sodium, the issue is often water excess rather than sodium deficiency. Supplementation for these people may correct the electrolyte imbalance but at the expense of volume overload.
Volume contraction of intravascular fluid (blood plasma) is termed hypovolemia, [1] [2] and its signs include, in order of severity: a fast pulse; infrequent and low volume urination; dry mucous membranes (e.g. a dry tongue)