Hyperkalemia: Difference between revisions
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In [[medicine]], '''hyperkalemia''' is an "abnormally high [[potassium]] concentration in the blood, most often due to defective renal excretion. It is characterized clinically by [[electrocardiogram|electrocardiographic]] abnormalities (elevated T waves and depressed P waves, and eventually by atrial asystole). In severe cases, weakness and flaccid paralysis may occur."<ref>{{MeSH}}</ref> | In [[medicine]], '''hyperkalemia''' is an "abnormally high [[potassium]] concentration in the blood, most often due to defective renal excretion. It is characterized clinically by [[electrocardiogram|electrocardiographic]] abnormalities (elevated T waves and depressed P waves, and eventually by atrial asystole). In severe cases, weakness and flaccid paralysis may occur."<ref>{{MeSH}}</ref> Hyperkalemia begins with a level of 5.0 mEq/L. | ||
Severe hyperkalemia is a life-threatening condition; indeed, intravenous [[potassium chloride]] is used to stop the heart both for [[open-heart surgery]] and [[lethal execution]]. | Severe hyperkalemia is a life-threatening condition; indeed, intravenous [[potassium chloride]] is used to stop the heart both for [[open-heart surgery]] and [[lethal execution]]. | ||
==Spurious hyperkalemia== | |||
Blood drawing errors, as well as confounding factors, can artificially raise measured potassium. The most common cause is contamination from a hemolyzed clot; pinkish serum samples should be discarded and taken again. If the patient strongly contracts muscles during [[phlebotomy]], as by not releasing a clenched fist requested to help visualize the vein, the muscles may release potassium. | |||
Elevations in [[platelet]]s and [[lactic dehydrogenase]] also can artificially raise the potassium level. | |||
==Treatment== | ==Treatment== | ||
Treatment includes both emergency and continued therapy. | Treatment includes both emergency and continued therapy. Emergency therapy needs to be instituted if the level is 7.0 or greater. | ||
===Emergency management=== | ===Emergency management=== | ||
Calcium gluconate (preferably) or calcium chloride should be administered immediately, two standard ampules of the gluconate as an intravenous bolus, followed by a continuing drip of calcium gluconate in dextrose in water. This helps stabilize the level. | |||
Intravenous [[insulin]] with [[glucose]], and inhaled [[adrenergic beta-agonist]]s, used separately or together, are established therapies for lowering potassium levels. <ref name=AFP>{{citation | Intravenous [[insulin]] with [[glucose]], and inhaled [[adrenergic beta-agonist]]s, used separately or together, are established therapies for lowering potassium levels. <ref name=AFP>{{citation | ||
| url = http://www.aafp.org/afp/2006/0115/p283.html | | url = http://www.aafp.org/afp/2006/0115/p283.html | ||
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| date = 2006 Jan 15| volume = 73| issue = 2 | pages =283-290}}</ref> | | date = 2006 Jan 15| volume = 73| issue = 2 | pages =283-290}}</ref> | ||
===Continued lowering=== | ===Continued lowering=== | ||
Sodium polystyrene sulfonate (Kayexalate) is widely used for continued lowering of potassium levels. While the resin proper is considered safe, the available preparations with it suspended in [[sorbitol]] may be dangerous. <ref name="pmid20167700">{{cite journal| author=Sterns RH, Rojas M, Bernstein P, Chennupati S| title=Ion-exchange resins for the treatment of hyperkalemia: are they safe and effective? | journal=J Am Soc Nephrol | year= 2010 | volume= 21 | issue= 5 | pages= 733-5 | pmid=20167700 | Sodium polystyrene sulfonate (Kayexalate) is widely used for continued lowering of potassium levels. While the resin proper is considered safe, the available preparations with it suspended in [[sorbitol]] may be dangerous. <ref name="pmid20167700">{{cite journal| author=Sterns RH, Rojas M, Bernstein P, Chennupati S| title=Ion-exchange resins for the treatment of hyperkalemia: are they safe and effective? | journal=J Am Soc Nephrol | year= 2010 | volume= 21 | issue= 5 | pages= 733-5 | pmid=20167700 | ||
| url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=clinical.uthscsa.edu/cite&retmode=ref&cmd=prlinks&id=20167700 | doi=10.1681/ASN.2010010079 }} </ref><ref name="pmid19373153">{{cite journal| author=McGowan CE, Saha S, Chu G, Resnick MB, Moss SF| title=Intestinal necrosis due to sodium polystyrene sulfonate (Kayexalate) in sorbitol. | journal=South Med J | year= 2009 | volume= 102 | issue= 5 | pages= 493-7 | pmid=19373153 | | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=clinical.uthscsa.edu/cite&retmode=ref&cmd=prlinks&id=20167700 | doi=10.1681/ASN.2010010079 }} </ref><ref name="pmid19373153">{{cite journal| author=McGowan CE, Saha S, Chu G, Resnick MB, Moss SF| title=Intestinal necrosis due to sodium polystyrene sulfonate (Kayexalate) in sorbitol. | journal=South Med J | year= 2009 | volume= 102 | issue= 5 | pages= 493-7 | pmid=19373153 | ||
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It may be accompanied by intravenous [[furosemide]] in saline. <ref name=AFP/> | It may be accompanied by intravenous [[furosemide]] in saline. <ref name=AFP/> | ||
Hemodialysis is the most definitive treatment. | |||
==References== | ==References== | ||
{{reflist|2}} | {{reflist|2}} | ||
Revision as of 22:33, 14 June 2010
In medicine, hyperkalemia is an "abnormally high potassium concentration in the blood, most often due to defective renal excretion. It is characterized clinically by electrocardiographic abnormalities (elevated T waves and depressed P waves, and eventually by atrial asystole). In severe cases, weakness and flaccid paralysis may occur."[1] Hyperkalemia begins with a level of 5.0 mEq/L.
Severe hyperkalemia is a life-threatening condition; indeed, intravenous potassium chloride is used to stop the heart both for open-heart surgery and lethal execution.
Spurious hyperkalemia
Blood drawing errors, as well as confounding factors, can artificially raise measured potassium. The most common cause is contamination from a hemolyzed clot; pinkish serum samples should be discarded and taken again. If the patient strongly contracts muscles during phlebotomy, as by not releasing a clenched fist requested to help visualize the vein, the muscles may release potassium.
Elevations in platelets and lactic dehydrogenase also can artificially raise the potassium level.
Treatment
Treatment includes both emergency and continued therapy. Emergency therapy needs to be instituted if the level is 7.0 or greater.
Emergency management
Calcium gluconate (preferably) or calcium chloride should be administered immediately, two standard ampules of the gluconate as an intravenous bolus, followed by a continuing drip of calcium gluconate in dextrose in water. This helps stabilize the level.
Intravenous insulin with glucose, and inhaled adrenergic beta-agonists, used separately or together, are established therapies for lowering potassium levels. [2]
Continued lowering
Sodium polystyrene sulfonate (Kayexalate) is widely used for continued lowering of potassium levels. While the resin proper is considered safe, the available preparations with it suspended in sorbitol may be dangerous. [3][4]
It may be accompanied by intravenous furosemide in saline. [2]
Hemodialysis is the most definitive treatment.
References
- ↑ Anonymous (2024), Hyperkalemia (English). Medical Subject Headings. U.S. National Library of Medicine.
- ↑ 2.0 2.1 Joyce C. Hollander-Rodriguez and James F. Calvert (2006 Jan 15), "Hyperkalemia", American Family Physician 73 (2): 283-290
- ↑ Sterns RH, Rojas M, Bernstein P, Chennupati S (2010). "Ion-exchange resins for the treatment of hyperkalemia: are they safe and effective?". J Am Soc Nephrol 21 (5): 733-5. DOI:10.1681/ASN.2010010079. PMID 20167700. Research Blogging.
- ↑ McGowan CE, Saha S, Chu G, Resnick MB, Moss SF (2009). "Intestinal necrosis due to sodium polystyrene sulfonate (Kayexalate) in sorbitol.". South Med J 102 (5): 493-7. DOI:10.1097/SMJ.0b013e31819e8978. PMID 19373153. Research Blogging.