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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]
Intravascular volume depletion is divided into three types based on the blood sodium level: Isonatremic (normal blood sodium levels) Example: a child with diarrhea, because both water and sodium are lost in diarrhea.
ICD-10 is the 10th revision of the International Classification of Diseases (ICD), a medical classification list by the World Health Organization (WHO). It contains codes for diseases, signs and symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or diseases. [1]
[10] 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]
Symptoms of hypovolemic shock can be related to volume depletion, electrolyte imbalances, or acid–base disorders that accompany hypovolemic shock. [4]Patients with volume depletion may complain of thirst, muscle cramps, and/or orthostatic hypotension.
Thus, in term neonates, a FE Na of <3% represents volume depletion, and a FE Na as high as 4% may represent maximal sodium conservation in critically ill preterm neonates. [4] [5] The FE Na may also be spuriously elevated in children with adrenal insufficiency or pre-existing kidney disease (such as obstructive uropathy) due to salt wasting. [6]
Hypovolemic shock is the most common type of shock and is caused by insufficient circulating volume. [6] The most common cause of hypovolemic shock is hemorrhage (internal or external); however, vomiting and diarrhea are more common causes in children. [ 9 ]
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.