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Hypokalemia and Hyperkalemia ANTHONY J Potassium Disorders: Hypokalemia and Hyperkalemia ANTHONY J. VIERA, MD, MPH, and NOAH WOUK, MD, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina Hypokalemia and hyperkalemia are common electrolyte disorders caused by changes in potassium intake, altered excretion, or transcellular shifts. Diuretic use and gastrointestinal losses are common causes of hypokalemia, whereas kidney disease, hyperglycemia, and medication use are common causes of hyperkalemia. When severe, potassium disorders can lead to life-threatening cardiac conduction disturbances and neuromuscular dysfunction. Therefore, a first priority is determining the need for urgent treatment through a combination of history, physical examination, laboratory, and electrocardiography findings. Indications for urgent treatment include severe or symptomatic hypo- kalemia or hyperkalemia; abrupt changes in potassium levels; electrocardiography changes; or the presence of certain comorbid conditions. Hypokalemia is treated with oral or intravenous potassium. To prevent cardiac conduction dis- turbances, intravenous calcium is administered to patients with hyperkalemic electrocardiography changes. Insulin, usually with concomitant glucose, and albuterol are preferred to lower serum potassium levels in the acute setting; sodium polystyrene sulfonate is reserved for subacute treatment. For both disorders, it is important to consider poten- tial causes of transcellular shifts because patients are at increased risk of rebound potassium disturbances. (Am Fam Physician. 2015;92(6):487-495. Copyright © 2015 American Academy of Family Physicians.) More online otassium disorders are common. same dosage, chlorthalidone is more likely to at http://www. Hypokalemia (serum potassium induce hypokalemia than hydrochlorothia- aafp.org/afp. level less than 3.6 mEq per L [3.6 zide, which is more often implicated because CME This clinical content mmol per L]) occurs in up to 21% of its widespread use.11,12 Diuretic-induced conforms to AAFP criteria Pof hospitalized patients and 2% to 3% of hypokalemia is dose-dependent and tends to for continuing medical education (CME). See outpatients.1-3 Hyperkalemia (serum potas- be mild (3 to 3.5 mEq per L [3 to 3.5 mmol CME Quiz Questions on sium level more than 5 mEq per L [5 mmol per L]), although it can be more severe when page 441. per L] in adults, more than 5.5 mEq per L accompanied by other causes (e.g., gastroin- Author disclosure: No rel- [5.5 mmol per L] in children, and more than testinal [GI] losses).13 evant financial affiliations. 6 mEq per L [6 mmol per L] in neonates) GI LOSSES Patient information: occurs in up to 10% of hospitalized patients A handout on this topic, and approximately 1% of outpatients.4,5 The GI losses are another common cause of written by the authors of body’s plasma potassium concentration is hypokalemia, particularly among hospital- this article, is available 9 at http://www.aafp.org/ closely regulated by a variety of mechanisms. ized patients. The mechanism by which afp/2015/0915/p487-s1. upper GI losses induce hypokalemia is indi- html. Causes of Hypokalemia rect and stems from the kidney’s response to Hypokalemia results from abnormal losses, the associated alkalosis. As a portion of daily transcellular shifts, or insufficient intake potassium is excreted in the colon, lower (Table 1).6-8 Abnormal losses are most com- GI losses in the form of persistent diarrhea mon.9 Because the kidney can significantly can also result in hypokalemia and may be lower potassium excretion in response to accompanied by hyperchloremic acidosis.6 decreased intake, insufficient intake is rarely the sole cause of hypokalemia, but it often contrib- Evaluation and Management utes to hypokalemia in hospitalized patients.9 of Hypokalemia GENERAL PRINCIPLES RENAL LOSSES Hypokalemia is often asymptomatic. Evalu- Diuretic use is a common cause of renally ation begins with a search for warning signs mediated hypokalemia.10 When given in the or symptoms warranting urgent treatment SeptemberDownloaded 15, from 2015 the American◆ Volume Family 92, NumberPhysician website6 at www.aafp.org/afp.www.aafp.org/afp Copyright © 2015 American Academy of FamilyAmerican Physicians. Family For the Physician private, noncom 487- mercial use of one individual user of the website. All other rights reserved. Contact [email protected] for copyright questions and/or permission requests. Potassium Disorders Table 1. Causes of Hypokalemia Abnormal losses Transcellular shifts Medications (continued) 7,14 (Figure 1). These include weakness or pal- Diuretics Alkalosis pitations, changes on electrocardiography Laxatives and enemas Refeeding syndrome (ECG), severe hypokalemia (less than 2.5 Corticosteroids Increased beta2 adrenergic stimulation mEq per L [2.5 mmol per L]), rapid-onset Gastrointestinal losses Delirium tremens hypokalemia, or underlying heart disease Renal losses Head injury or cirrhosis.7,15 Most cases of hypokalemia- Osmotic diuresis Myocardial ischemia induced rhythm disturbances occur in Mineralocorticoid excess Thyrotoxicosis individuals with underlying heart disease.10 Types I and II renal tubular acidosis Familial hypokalemic periodic Polydipsia Early identification of transcellular shifts is paralysis Intrinsic renal transport defects important because management may differ. Hypothermia Hypomagnesemia Identification and treatment of concurrent Inadequate intake Dialysis/plasmapheresis hypomagnesemia are also important because Anorexia Transcellular shifts magnesium depletion impedes potassium Dementia Medications repletion and can exacerbate hypokalemia- Starvation 16,17 Insulin overdose induced rhythm disturbances. Total parenteral nutrition Beta sympathomimetics 2 Pseudohypokalemia HISTORY AND PHYSICAL EXAMINATION Decongestants Delayed sample analysis Xanthines A focused history includes evaluation for Significant leukocytosis Amphotericin B 3 possible GI losses, review of medications, (> 75,000 cells per mm Verapamil intoxication 9 and assessment for underlying cardiac [75.0 × 10 per L]) Chloroquine (Aralen) intoxication comorbidities. A history of paralysis, hyper- Barium intoxication thyroidism, or use of insulin or beta agonists Cesium intoxication suggests possible transcellular shifts leading to redistributive hypokalemia. The physical NOTE: Listed in approximate order of frequency. examination should focus on identifying Information from references 6 through 8. cardiac arrhythmias and neurologic mani- festations, which range from generalized weakness to ascending paralysis. arrhythmias increases as serum potassium concentra- tion decreases, these findings are not reliable because LABORATORY ANALYSIS AND ECG some patients with severe hypokalemia do not have The diagnosis should be confirmed with a repeat serum ECG changes.20 potassium measurement. Other laboratory tests include serum glucose and magnesium levels, urine electrolyte Treatment of Hypokalemia and creatinine levels, and acid-base balance. The most The immediate goal of treatment is the prevention of accurate method for evaluating urinary potassium excre- potentially life-threatening cardiac conduction distur- tion is a 24-hour timed urine potassium collection; nor- bances and neuromuscular dysfunction by raising serum mal kidneys excrete no more than 15 to 30 mEq per L potassium to a safe level. Further replenishment can pro- (15 to 30 mmol per L) of potassium per day in response to ceed more slowly, and attention can turn to the diagnosis hypokalemia. A more practical approach is calculation of and management of the underlying disorder.15 Patients the urine potassium-to-creatinine ratio from a spot urine with a history of congestive heart failure or myocardial specimen; a ratio greater than 1.5 mEq per mmol (13 mEq infarction should maintain a serum potassium concen- per g) is indicative of renal potassium wasting.18 If no tration of at least 4 mEq per L (4 mmol per L), based on cause is identified with the initial workup, assessment of expert opinion.15 thyroid and adrenal function should be considered. Careful monitoring during treatment is essential Typically, the first ECG manifestation of hypokale- because supplemental potassium is a common cause mia is decreased T-wave amplitude. Further progression of hyperkalemia in hospitalized patients.21 The risk of can lead to ST-interval depression, T-wave inversions, rebound hyperkalemia is higher when treating redis- PR-interval prolongation, and U waves. Arrhythmias tributive hypokalemia. Because serum potassium con- associated with hypokalemia include sinus bradycar- centration drops approximately 0.3 mEq per L (0.3 dia, ventricular tachycardia or fibrillation, and torsade mmol per L) for every 100-mEq (100-mmol) reduction de pointes.19 Although the risk of ECG changes and in total body potassium, the approximate potassium 488 American Family Physician www.aafp.org/afp Volume 92, Number 6 ◆ September 15, 2015 Potassium Disorders deficit can be estimated in patients with abnormal losses Potassium should not be given in dextrose-containing and decreased intake. For example, a decline in serum solutions because dextrose-stimulated insulin secretion potassium from 3.8 to 2.9 mEq per L (3.8 to 2.9 mmol per L) can exacerbate hypokalemia. roughly corresponds to a 300-mEq (300-mmol) reduc- Nonurgent hypokalemia is treated with 40 to 100 mmol tion in total body potassium. Additional potassium will of oral potassium per day over days to weeks. For the pre- be required if losses are ongoing.
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