Medication Summary
Medical therapy for rhabdomyolysis focuses on restoring adequate intravascular volume. Hydration with isotonic sodium chloride solution (0.9% NaCl) is the cornerstone of rhabdomyolysis therapy. Many clinicians recommend the use of sodium bicarbonate. Use furosemide or other diuretics (such as mannitol in adults) with sufficient hydration if urine output is inadequate. Hyperkalemia should also be addressed.
Volume Expanders
Class Summary
The use of crystalloid solutions is the cornerstone of rhabdomyolysis therapy.
Sodium chloride 0.9%
Aggressive and early hydration with isotonic sodium chloride solution is important for the prevention of pigment-associated renal failure.
Diuretics, Loop
Class Summary
Loop diuretics promote the excretion of water and electrolytes by the kidneys.
Furosemide (Lasix)
Furosemide increases water excretion by interfering with the chloride-binding cotransport system; this, in turn, inhibits sodium and chloride reabsorption in the ascending loop of Henle and the distal renal tubule. Dosing must be individualized. Depending on the response, administer at increments of 20-40 mg every 6-8 hours until the desired diuresis occurs. When treating infants, titrate in increments of 1 mg/kg until a satisfactory effect is achieved.
Diuretics, Osmotic Agents
Class Summary
Osmotic diuretics increase osmolarity of glomerular filtrate and induce diuresis. They hinder tubular reabsorption of water, causing sodium and chloride excretion to increase.
Mannitol (Osmitrol)
Mannitol is an alternative diuretic used when urine output is inadequate despite aggressive fluid therapy. Initially, assess for adequate renal function in adults by administering a test dose of 200 mg/kg intravenously (IV) over 3-5 minutes; this should produce a urine flow of at least 30-50 mL/h over 2-3 hours. In children, assess for adequate renal function by administering a test dose of 200 mg/kg IV over 3-5 minutes; this should produce a urine flow of at least 1 mL/h over 1-3 hours.
Antidotes, Other
Class Summary
Intracellular potassium transporters are used to decrease serum potassium levels. Insulin causes a transcellular shift of potassium into muscle cells, thereby temporarily lowering serum levels of potassium.
Potassium exchange resins decrease serum potassium levels. Sodium polystyrene sulfonate is an exchange resin that can be used to treat mild-to-moderate hyperkalemia. Each 1 mEq of potassium is exchanged for 1 mEq of sodium.
Insulin regular human (Humulin, Novolin)
Regular human insulin stimulates cellular potassium uptake within 20-30 minutes. Administer with dextrose to prevent hypoglycemia. Monitor blood sugar levels frequently.
Sodium polystyrene sulfonate (Kayexalate)
Sodium polystyrene sulfonate exchanges sodium for potassium and binds it in the gut, primarily the large intestine. It decreases total-body potassium levels. Onset of action after oral administration ranges from 2-12 hours and takes longer after rectal administration.
Sodium polystyrene sulfonate should not be used as first-line therapy for severe life-threatening hyperkalemia. It may be used in the second stage of therapy to reduce total-body potassium levels. The resin is typically mixed in 25% sorbitol before administration.
Beta2-Agonists
Class Summary
Beta2 -adrenergic agents are used adjunctively to decrease serum potassium levels temporarily. Albuterol and other beta-adrenergic agents induce the intracellular movement of potassium via stimulation of the sodium-potassium adenosine triphosphatase (Na/K-ATPase) pump. Some studies using nebulized albuterol in adults and children indicate that this method of therapy is effective in lowering serum potassium levels, but peak response is unclear. Therefore, nebulized albuterol has not been established as a first-line therapy in severe hyperkalemia.
Albuterol nebulized
Nebulized albuterol is an adrenergic agonist that increases plasma insulin concentrations. This increase in insulin may shift potassium into the intracellular space. The onset of the decrease in potassium occurs at about 30 minutes. The duration of action is dose-dependent and is typically between 2 and 5 hours.
Alkalinizing Agents
Class Summary
Sodium bicarbonate is administered IV to alkalize urine in patients with rhabdomyolysis. This may prevent toxicity caused by the presence of myoglobin in acidic urine and crystallization of uric acid.
Sodium bicarbonate (Neut)
Sodium bicarbonate is useful in alkalization of urine to prevent acute myoglobinuric renal failure. Titrate the dose to raise the pH above 6.5-7.0.
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