USMLE Prep - Medical Reference Library

Rhabdomyolysis — Fluids and Complication Prevention

System: Nephrology • Reviewed: Aug 31, 2025 • Step 1Step 2Step 3

Synopsis:

Identify muscle injury with elevated CK and myoglobinuria; give early isotonic fluids, monitor electrolytes and urine output, and manage complications such as hyperkalemia and AKI.

Key Points

  • Stabilize ABCs; begin targeted evaluation without delaying life-saving therapy.
  • Use system-specific risk tools to guide testing and disposition.
  • Order high-yield tests first; escalate imaging when indicated.
  • Start evidence-based initial therapy and reassess frequently.

Algorithm

  1. Primary survey and vitals; IV access and monitors.
  2. Focused history/physical; identify red flags and likely etiologies.
  3. Order system-appropriate labs and imaging (see Investigations).
  4. Initiate guideline-based empiric therapy (see Pharmacology).
  5. Reassess response; arrange consultation and definitive management.

Clinical Synopsis & Reasoning

For Rhabdomyolysis Acute Management, frame the differential by acuity and pathophysiology, then align diagnostics to the leading hypotheses. Prioritize stabilization while obtaining high‑yield studies such as BMP (Renal/electrolytes), UA ± culture (Hematuria/proteinuria/infection), Renal ultrasound (selected) (Obstruction). Incorporate bedside imaging and targeted labs to define severity and identify complications; synthesize results with clinical trajectory to refine the working diagnosis and disposition needs.


Treatment Strategy & Disposition

Initiate disease‑directed therapy alongside supportive care, titrating to objective response. Pharmacologic options commonly include IV Fluids, Electrolyte repletion. Use validated frameworks (e.g., Key Targets) to guide escalation and site of care. Address precipitating factors, de‑escalate empiric therapies with data, and arrange follow‑up for monitoring and risk‑factor modification; admit patients with instability, high risk of deterioration, or needs for close monitoring.


Epidemiology / Risk Factors

  • CKD/AKI, nephrotoxins; obstruction

Investigations

TestRole / RationaleTypical FindingsNotes
BMPRenal/electrolytesAKI/lyte changes
UA ± cultureHematuria/proteinuria/infectionFindings vary
Renal ultrasound (selected)ObstructionHydronephrosis

Key Targets

ParameterGoal
Urine outputAround 200 to 300 mL per hour initially when safe
PotassiumAvoid hyperkalemia via monitoring and treatment
CK trendDowntrending with therapy

Pharmacology

MedicationMechanismOnsetRole in TherapyLimitations
Aggressive IV fluidsVolume expansionImmediatePrevent AKIFluid overload
Bicarbonate (selected)Alkalinize urineHoursSevere casesHypokalemia

Prognosis / Complications

  • Reversibility by cause; electrolyte/volume complications

Patient Education / Counseling

  • Explain red flags and when to seek emergent care.
  • Reinforce medication adherence and follow-up plan.

Notes

Routine urine alkalinization is not required; consider only in selected cases. Avoid nephrotoxins and adjust medications to renal function.


References

  1. KDIGO AKI Guidance — Rhabdomyolysis — Link
  2. WMS and Trauma Resources — Rhabdomyolysis — Link