Rhabdomyolysis is the breakdown of muscle fibers that leads to the release of muscle fiber contents (myoglobin) into the bloodstream. Myoglobin is harmful to the kidney and often causes kidney damage.
Causes, incidence, and risk factors
When muscle is damaged, a protein called myoglobin is released into the bloodstream. It is then filtered out of the body by the kidneys. Myoglobin breaks down into substances that can damage kidney cells.
Rhabdomyolysis may be caused by any condition that damages skeletal muscle, especially injury.
Risk factors include the following:
- (dark, red, or cola colored)Abnormal urine color
- Decreased urine production
- General weakness
- Muscle stiffness or aching (myalgia )
- Muscle tenderness
- of the affected musclesWeakness
Other symptoms that may occur with this disease:
Signs and tests
An examination shows tender or damaged skeletal muscles.
The following tests may be done:
This disease may also affect the results of the following tests:
Getting fluids that contain bicarbonate may prevent kidney damage by quickly flushing myoglobin out of the kidneys. Fluids may need to be given through a vein (by IV). Some patients may need kidney dialysis.
Medicines that may be prescribed include diuretics and bicarbonate (if there is enough urine output).
and low blood calcium levels (hypocalcemia) should be treated right away, if present. Hyperkalemia should also be treated.Kidney failure
The outcome depends on the amount of kidney damage . Acute kidney failure occurs in many patients. Getting treated soon after rhabdomyolysis begins will reduce the risk of permanent kidney damage.
People with milder cases may return to their normal activities within a few weeks to a month. However, some people continue to have problems with fatigue and muscle pain.
Calling your health care provider
Call your health care provider if you have symptoms of rhabdomyolysis.
Drink plenty of fluids after strenuous exercise to dilute your urine and flush any myoglobin that is released from your muscles out of your kidneys. Also drink a lot of fluids after any condition or event that may have damaged skeletal muscle.
O'Connor FG, Deuster PA. Rhabdomyolysis. In: Goldman L, Ausiello D, eds. . 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 114.
Remuzzi G, Perico N, DeBroe ME. Acute kidney injury. In: Brenner BM, ed. . 8th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 29.