Updated July 2026 · 9 min read

Rhabdomyolysis for ICU Nurses 2026

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A patient comes in after a long lie on the floor, a crush injury, a seizure, or extreme exertion — and the urine is the color of cola. Rhabdomyolysis is muscle breaking down and spilling its contents into the bloodstream, and the reason it lands in the ICU is that those contents can shut down the kidneys and stop the heart. The good news: the single most important treatment is one the nurse largely runs at the bedside — fluids, early and aggressive.

What's actually happening

When muscle cells are damaged — by crush, prolonged immobilization, seizures, extreme exertion, drugs/toxins, certain infections, or the hyperthermic syndromes — they rupture and dump their intracellular contents. Myoglobin is the dangerous one for the kidneys: it's filtered by the glomerulus, precipitates in the tubules, is directly toxic to tubular cells, and causes vasoconstriction — a three-hit path to acute kidney injury (AKI). At the same time, the muscle releases potassium and phosphate, and pulls calcium into the injured tissue. CK, an enzyme abundant in muscle, rises in proportion to the damage and is the marker the team trends.

The classic clues

The textbook triad is muscle pain, weakness, and dark ("tea-" or "cola-colored") urine, though many patients don't show all three. That dark urine is myoglobin — and a urine dipstick that's positive for blood but shows no red cells under the microscope is a classic hint, because the dipstick can't tell myoglobin from hemoglobin. A markedly elevated CK confirms it. Ask about the setup: a found-down patient, a recent seizure or intense workout, a crush, statin use, cocaine or other toxins, or a hyperthermic drug reaction.

Fluids are the treatment

The cornerstone is early, aggressive IV fluid resuscitation, started as soon as rhabdomyolysis is suspected — before the kidneys are injured, not after. The goal is to restore volume (these patients are often profoundly volume-depleted, with fluid sequestered in swollen muscle) and to drive a generous urine output that flushes myoglobin through the tubules before it can precipitate. Isotonic fluid is the workhorse; large daily volumes are often required, guided by urine output and hemodynamics. The nurse is the person titrating to that urine-output target, tracking ins and outs meticulously, and watching for the volume overload that can occur once the kidneys are compromised.

The electrolyte danger — watch the potassium

Broken muscle releases a large potassium load, and if the kidneys can't excrete it, hyperkalemia is the most immediately life-threatening problem — it can cause fatal arrhythmias before the CK peak is even known. Keep the patient on a monitor, watch for peaked T waves and a widening QRS, and treat hyperkalemia aggressively. Phosphate rises too. Calcium often falls early (pulled into injured muscle) and can rebound to high later as the muscle heals, so calcium is generally not replaced unless the patient is symptomatic or dangerously hyperkalemic, to avoid overshoot during recovery.

The adjuncts and the complications

Urinary alkalinization with sodium bicarbonate and the use of mannitol are more debated and vary by institution — volume resuscitation is the consistent, evidence-supported core. Watch for the complications: AKI that may require dialysis, compartment syndrome (a swollen, tense, disproportionately painful limb — a surgical emergency), and DIC in severe cases. Remove or treat the cause too: stop the offending drug, control seizures or agitation, relieve compression, and cool the hyperthermic patient.

What the nurse holds together

Rhabdomyolysis is a race between fluid and the kidney. The nurse who recognizes cola-colored urine in a found-down or post-seizure patient, gets aggressive fluids running early, drives and documents urine output, keeps the patient monitored for the potassium that can kill fastest, and stays alert for a tightening compartment is doing the work that decides whether this patient walks out with functioning kidneys or ends up on dialysis. Related reading: hyperkalemia emergency treatment, lactated Ringers vs normal saline, and serotonin syndrome vs NMS.