Hyperkalemia

Hyperkalemia
Specialty	Endocrinology

Hyperkalemia (hyper- high; kalium, potassium; -emia, "in the blood") is an elevated blood level of the electrolyte potassium. Extreme hyperkalemia is a medical emergency due to the risk of potentially fatal abnormal heart rhythms (arrhythmia).

Signs and symptoms

Symptoms are fairly nonspecific and generally include malaise, palpitations and muscle weakness; mild hyperventilation may indicate a compensatory response to metabolic acidosis, which is one of the possible causes of hyperkalemia. Often, however, the problem is detected during screening blood tests for a medical disorder, or it only comes to medical attention after complications have developed, such as cardiac arrhythmia or sudden death.

During the medical history taking, a physician will dwell on kidney disease and medication use (see below), as these are the main causes. The combination of abdominal pain, hypoglycemia and hyperpigmentation, often in the context of a history of other autoimmune disorders, may be signs of Addison's disease, itself a medical emergency.

Diagnosis

In order to gather enough information for diagnosis, the measurement of potassium needs to be repeated, as the elevation can be due to hemolysis in the first sample. The normal serum level of potassium is 3.5 to 5 mEq/L. Generally, blood tests for renal function (creatinine, blood urea nitrogen), glucose and occasionally creatine kinase and cortisol will be performed. Calculating the trans-tubular potassium gradient can sometimes help in distinguishing the cause of the hyperkalemia.

In many cases, renal ultrasound will be performed, since hyperkalemia is highly suggestive of renal failure.

Also, electrocardiography (EKG/ECG) may be performed to determine if there is a significant risk of cardiac arrhythmias (see ECG/EKG Findings, below).

Differential diagnosis

Causes include:

Ineffective elimination from the body

• Renal insufficiency
• Medication that interferes with urinary excretion:
  • ACE inhibitors and angiotensin receptor blockers
  • Potassium-sparing diuretics (e.g. amiloride and spironolactone)
  • NSAIDs such as ibuprofen, naproxen, or celecoxib
  • The calcineurin inhibitor immunosuppressants ciclosporin and tacrolimus
  • The antibiotic trimethoprim
  • The antiparasitic drug pentamidine
• Mineralocorticoid deficiency or resistance, such as:
  • Addison's disease
  • Aldosterone deficiency, including reduced levels due to the blood thinner, heparin
  • Some forms of congenital adrenal hyperplasia
  • Type IV renal tubular acidosis (resistance of renal tubules to aldosterone)
• Gordon's syndrome (“familial hypertension with hyperkalemia”), a rare genetic disorder caused by defective modulators of salt transporters, including the thiazide-sensitive Na-Cl cotransporter.

Excessive release from cells

• Rhabdomyolysis, burns or any cause of rapid tissue necrosis, including tumor lysis syndrome
• Massive blood transfusion or massive hemolysis
• Shifts/transport out of cells caused by acidosis, low insulin levels, beta-blocker therapy, digoxin overdose, or the paralyzing agent succinylcholine

Excessive intake

• Intoxication with salt-substitute, potassium-containing dietary supplements, or potassium chloride (KCl) infusion. Note that for a person with normal kidney function and nothing interfering with normal elimination (see above), hyperkalemia by potassium intoxication would be seen only with large infusions of KCl or oral doses of several hundred millequivalents of KCl.

Lethal injection

Hyperkalemia is intentionally brought about in an execution by lethal injection, with potassium chloride being the third and last of the three drugs administered to cause death.

Pseudohyperkalemia

Pseudohyperkalemia is a rise in the amount of potassium that occurs due to excessive leakage of potassium from cells, during or after blood is drawn. It is a laboratory artifact rather than a biological abnormality and can be misleading to caregivers. Pseudohyperkalemia is typically caused by hemolysis during venipuncture (by either excessive vacuum of the blood draw or by a collection needle that is of too fine a gauge); excessive tournequet time or fist clenching during phlebotomy (which presumably leads to efflux of potassium from the muscle cells into the bloodstream); or by a delay in the processing of the blood specimen. It can also occur in specimens from patients with abnormally high numbers of platelets (>1,000,000/mm³), leukocytes (> 100 000/mm³), or erythrocytes (hematocrit > 55%). People with "leakier" cell membranes have been found, whose blood must be separated immediately to avoid pseudohyperkalemia.

Pathophysiology

Potassium is the most abundant intracellular cation. It is critically important for many physiologic processes, including maintenance of cellular membrane potential, homeostasis of cell volume, and transmission of action potentials in nerve cells. Its main dietary sources are vegetables (tomato and potato), fruits (orange and banana) and meat. Elimination is through the gastrointestinal tract and the kidney.

The renal elimination of potassium is passive (through the glomeruli), and resorption is active in the proximal tubule and the ascending limb of the loop of Henle. There is active excretion of potassium in the distal tubule and the collecting duct; both are controlled by aldosterone.

Hyperkalemia develops when there is excessive production (oral intake, tissue breakdown) or ineffective elimination of potassium. Ineffective elimination can be hormonal (in aldosterone deficiency) or due to causes in the renal parenchyma that impair excretion.

Increased extracellular potassium levels result in depolarization of the membrane potentials of cells. This depolarization opens some voltage-gated sodium channels, but not enough to generate an action potential. After a short while, the open sodium channels inactivate and become refractory, increasing the threshold to generate an action potential. This leads to the impairment of neuromuscular, cardiac, and gastrointestinal organ systems. Of most concern is the impairment of cardiac conduction which can result in ventricular fibrillation or asystole.

During extreme exercise, potassium is released from active muscle and the serum potassium rises to a point that would be dangerous at rest. For unclear reasons, it appears as if the high levels of adrenaline and noradrenaline have a protective effect on the cardiac electrophysiology.

Patients with the rare hereditary condition of hyperkalemic periodic paralysis appear to have a heightened sensitivity of muscular symptoms that are associated with transient elevation of potassium levels. Episodes of muscle weakness and spasms can be precipitated by exercise or fasting in these subjects.

ECG findings

With mild to moderate hyperkalemia, there is reduction of the size of the P wave and development of peaked T waves. Severe hyperkalemia results in a widening of the QRS complex, and the EKG complex can evolve to a sinusoidal shape. There appears to be a direct effect of elevated potassium on some of the potassium channels that increases their activity and speeds membrane repolarization. Also, (as noted above), hyperkalemia causes an overall membrane depolarization that inactivates many sodium channels. The faster repolarization of the cardiac action potential causes the tenting of the T waves, and the inactivation of sodium channels causes a sluggish conduction of the electrical wave around the heart, which leads to smaller P waves and widening of the QRS complex.

The serum K⁺ concentration at which electrocardiographic changes develop is somewhat variable. Although the factors influencing the effect of serum potassium levels on cardiac electrophysiology are not entirely understood, the concentrations of other electrolytes, as well as levels of catecholamines, play a major role.

Treatment

Acute: When arrhythmias occur, or when potassium levels exceed 6.5 mmol/l, emergency lowering of potassium levels is mandated. Several agents are used to lower K levels. Choice depends on the degree and cause of the hyperkalemia, and other aspects of the patient's condition.

• Calcium supplementation (calcium gluconate 10% (10ml), preferably through a central venous catheter as the calcium may cause phlebitis) does not lower potassium but decreases myocardial excitability, protecting against life threatening arrhythmias.
• Insulin (e.g. intravenous injection of 10-15u of regular insulin {along with 50ml of 50% dextrose to prevent hypoglycemia}) will lead to a shift of potassium ions into cells, secondary to increased activity of the sodium-potassium ATPase.
• Bicarbonate therapy (e.g. 1 ampule (45mEq) infused over 5 minutes) is effective in cases of metabolic acidosis. The bicarbonate ion will stimulate an exchange of cellular H⁺ for Na⁺, thus leading to stimulation of the sodium-potassium ATPase.
• Salbutamol (albuterol, Ventolin) is a β₂-selective catecholamine that is administered by nebulizer (e.g. 10–20 mg). This drug promotes movement of K into cells, lowering the blood levels.
• Refractory or severe cases may need dialysis to remove the potassium from the circulation.

Prevention:

• Preventing recurrence of hyperkalemia typically involves reduction of dietary potassium, removal of an offending medication, and/or the addition of a diuretic (such as furosemide (Lasix) or hydrochlorothiazide).
• Polystyrene sulfonate (Calcium Resonium, Kayexalate) is a binding resin that binds K within the intestine and removes it from the body by defecation. Calcium Resonium (15g three times a day in water) can be given by mouth. Kayexelate (30g) can be given by mouth or as an enema. In both cases, the resin absorbs K within the intestine and carries it out of the body by defecation. This medication may cause diarrhea.

See also

• Hypokalemia
• Renal failure

External links

• Content of Selected Foods per Common Measure, sorted by nutrient content (Potassium)

USDA National Nutrient Database for Standard Reference, Release 20]

• List of foods rich in potassium
• National Kidney Foundation site on potassium content of foods