- Hypophosphatemia
DiseaseDisorder infobox
Name = Hypophosphatemia
ICD10 = ICD10|E|83|3|e|70
ICD9 = ICD9|275.3
ICDO =
Caption = Phosphate group chemical structure
OMIM =
OMIM_mult =
MedlinePlus = 000307
eMedicineSubj = med
eMedicineTopic = 1135
DiseasesDB = 6503
MeshID = D017674Hypophosphatemia is an
electrolyte disturbance in which there is an abnormally low level ofphosphate in theblood . The condition has many causes, but is most commonly seen when malnourished patients (especially chronic alcoholics) are given large amounts of carbohydrates, which create a high phosphorus demand by cells, removing phosphate from the blood ("refeeding syndrome ").Because a "decrease" in phosphate in the blood is sometimes associated with an "increase" in phosphate in the
urine , the terms hypophosphatemia and "phosphaturia" are occasionally used interchangeably; however, this is improper since there exist many causes of hypophosphatemia besides overexcretion and phosphaturia, and in fact the most common causes of hypophosphatemia are not associated with phosphaturia.Common causes of hypophosphatemia
*
Refeeding syndrome This causes a demand for phosphate in cells due to the action ofphosphofructokinase , an enzyme which attaches phosphate to glucose to begin metabolism of this. Also, production of ATP when cells are fed and recharge their energy supplies, requires phosphate.
*Respiratory alkalosis Any alkalemic condition moves phosphate out of the blood into cells. This includes most common respiratory alkalemia (a higher than normal blood pH from low carbon dioxide levels in the blood), which in turn is caused by any hyperventilation (such as sepsis, fever, pain, anxiety, drug withdrawal).
*Alcohol abuse Alcohol impairs phosphate absorption. Alcoholics are also malnourished with regard to minerals. In addition, alcohol treatment is associated with refeeding, and the stress ofalcohol withdrawal may create respiratory alkalosis, which exacerbates hypophosphatemia (see above).
*Malabsorption This includes GI damage, and also failure to absorb phosphate due to lack of vitamin D, or chronic use of phosphate binders such assucralfate , aluminum-containing antacids, and (more rarely) calcium-containing antacids.
* Hyperexcretion of phosphate in the urine (phosphaturia ), also known as primary hypophosphatemia. This includes excess excretion from renal dysfunction, and also the action of many classes ofdiuretic s. Additionally, both primary and secondaryhyperparathyroidism causes hyperexcretion of phosphate in the urine. Primary hypophosphatemia is the most common cause of nonnutritionalrickets . Laboratory findings include low-normal serumcalcium , moderately low serumphosphate , elevated serumalkaline phosphatase , and low serum 1,25 dihydroxy-vitamin D levels,hyperphosphaturia , and no evidence ofhyperparathyroidism . [Toy, Girardet, Hormann, Lahoti, McNeese, Sanders, and Yetman.Case Files: Pediatrics, Second Edition . 2007. McGraw Hill.]Other rarer causes include
* Certain blood cancers such as lymphoma or leukemia
*hereditary causes
*hepatic failure Pathophysiology
Hypophosphatemia is caused by the following three mechanisms:
* Inadequate intake (often unmasked in refeeding after long-term low phosphate intake)
* Increased excretion (e.g. in hyperparathyroidism)
* Shift from extracellular to intracellular space (seen in treatment ofdiabetic ketoacidosis , refeeding, short-term increases in cellular demand (e.g.,hungry bones syndrome ) and acuterespiratory alkalosis )Major signs and symptoms
* Muscle dysfunction and weakness. This occurs in major muscles, but also may manifest as:
diplopia , low cardiac output,dysphagia , and respiratory depression due to respiratory muscle weakness.
* Mental status changes. This may range from irritability to gross confusion, delirium, and coma.
* White cell dysfunction, causing worsening of infections
* Instability of cell membrates due to low ATP levels: this may causerhabdomyolysis with increased CPK, and alsohemolytic anemia .Treatment
Standard intravenous preparations of potassium phosphate are available and are routinely used in malnurished patients and alcoholics. Oral supplementation also is useful where no intravenous treatment is available. Historically one of the first demonstrations of this was in concentration camp victims who died soon after being re-fed: it was observed that those given milk (high in phosphate) had a higher survival rate than those who did not get milk.
ee also
*
Hyperphosphatemia
*Hypophosphatasia External links
* [http://www.emedicine.com/emerg/topic278.htm eMedicine review]
* [http://www.ccmtutorials.com/misc/phosphate/page_05.htm Tutorial - complications]
* [http://www.ccmtutorials.com/misc/phosphate/page_07.htm Refeeding Syndrome]References
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