Condition Deep-Dives 10 min read·Updated 22 July 2026 Clinician-reviewed

Rhabdomyolysis & Acute Kidney Injury

A UK Consultant Nephrologist on rhabdomyolysis — the release of myoglobin from injured skeletal muscle that can cause severe AKI, hyperkalaemia and metabolic chaos. Early recognition, aggressive fluids and exclusion of compartment syndrome save kidneys and lives.

  • Clinically Reviewed
  • NHS & NICE Aligned
  • UK Evidence-Based
  • Last Reviewed 22 July 2026

Professor Mohammed Mahdi Althaf

Consultant Nephrologist & Acute Physician

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Professor Mohammed Mahdi Althaf

MD, MSc, PgDip (Clin Ed), FRCP, FHEA, FASN

Consultant Nephrologist & Acute Physician · GMC 7216325

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Direct answer

Rhabdomyolysis releases myoglobin which precipitates in tubules and causes AKI. CK >5,000 U/L is the warning threshold. Treat with generous IV 0.9% saline aiming for urine output 200–300 mL/h, correct hyperkalaemia, exclude compartment syndrome, and consider dialysis for refractory hyperkalaemia, fluid overload or uraemia.

Key recommendation: CK > 5,000 U/L = AKI risk; > 15,000 U/L = high risk.

Quick answer

✓ Best choices

  • Adequate fluids once your team confirms it is safe (often 1.5–2 L/day)
  • Easily digested, nutrient-dense meals during recovery
  • Vegetables, fruit, oats and whole grains as appetite returns
  • Protein in modest portions — typically 0.8–1.0 g/kg/day unless advised otherwise

✓ Foods to limit

  • NSAIDs (ibuprofen, naproxen, diclofenac) — they are nephrotoxic
  • Very salty, processed or ultra-processed foods
  • Alcohol while bloods are still recovering

Key takeaway

Rhabdomyolysis releases myoglobin which precipitates in tubules and causes AKI. CK >5,000 U/L is the warning threshold. Treat with generous IV 0.9% saline aiming for urine output 200–300 mL/h, correct hyperkalaemia, exclude compartment syndrome, and consider dialysis for refractory hyperkalaemia, fluid overload or uraemia.

Who should be cautious

People on dialysis, post-transplant, pregnant or breastfeeding, or taking prescription medication — confirm with your renal team before changes.

Rhabdomyolysis & Acute Kidney Injury

Causes

Trauma & Crush

  • Road traffic collisions, falls, earthquake/disaster victims
  • Prolonged immobilisation (collapsed/elderly 'long lie', alcohol or drug overdose)
  • Electrical injury, lightning strike

Exercise-induced

  • Unaccustomed strenuous exercise (CrossFit, marathon, military training)
  • Sickle cell trait predisposition
  • Hot or humid conditions, dehydration

Drugs & Toxins

  • Statins (especially with fibrates, macrolides, ciclosporin)
  • Cocaine, amphetamines, MDMA, heroin
  • Alcohol
  • Neuroleptic malignant syndrome, serotonin syndrome
  • Snake/insect envenomation

Infections

  • Influenza, COVID-19, EBV, Legionella, Mycoplasma

Metabolic / Inherited

  • McArdle disease and other glycogen storage disorders
  • Carnitine palmitoyltransferase II deficiency
  • Severe hypokalaemia or hypophosphataemia
  • Diabetic ketoacidosis, hyperosmolar states

Other

  • Status epilepticus, prolonged dystonia
  • Compartment syndrome (cause and consequence)
  • Heat stroke

Diagnosis

CLINICAL TRIAD: muscle pain, weakness, dark (cola-coloured) urine — present in <10% of cases. Most diagnoses come from suspicion + labs.

Labs

  • CK > 1,000 U/L (often 10,000–100,000+)
  • Urine dipstick positive for blood with NO red cells on microscopy (myoglobinuria)
  • AKI (rising creatinine, falling eGFR)
  • Hyperkalaemia (often severe — from muscle K+ release)
  • Hyperphosphataemia, hyperuricaemia
  • Hypocalcaemia (early — Ca binds to damaged muscle); later rebound hypercalcaemia in recovery
  • Metabolic acidosis (often raised anion gap)
  • Disseminated intravascular coagulation in severe cases

Imaging

  • MRI if compartment syndrome suspected (oedema, T2 hyperintensity)
  • Doppler if vascular cause considered

ECG: peaked T waves, widening QRS — hyperkalaemia

Always measure compartment pressures if any concern.

Management

1. Resuscitation

  • ABCDE; oxygen if required
  • Large-bore IV access
  • START IV 0.9% sodium chloride or Hartmann's at 1–2 L/h initially (adjust for cardiac/renal reserve)
  • Aim urine output 200–300 mL/h
  • Continuous cardiac monitoring (hyperkalaemia)

2. Hyperkalaemia

  • Calcium gluconate 10% 10 mL IV if ECG changes
  • Insulin–glucose, salbutamol nebs
  • Sodium zirconium cyclosilicate or patiromer to bind K+
  • Avoid potassium-containing fluids (Hartmann's has 5 mmol/L K — usually fine, but switch to 0.9% saline if K rising)
  • Dialysis if refractory

3. URINARY ALKALINISATION (selective):

  • Consider bicarbonate infusion if urine pH < 6.5 despite fluids, or significant metabolic acidosis
  • Target urine pH > 6.5 — but no clear mortality benefit
  • Avoid worsening hypocalcaemia (bicarbonate lowers ionised Ca)

4. Compartment Syndrome

  • Urgent orthopaedic / vascular review
  • Fasciotomy if intracompartmental pressure > 30 mmHg or clinically severe

5. Avoid

  • NSAIDs, contrast, ACE/ARB in acute phase
  • Mannitol (no proven benefit, risk of volume overload)
  • Statins until recovery

6. Dialysis

  • Indications: refractory hyperkalaemia, fluid overload, uraemia, severe acidosis
  • Continuous RRT in haemodynamically unstable patients
  • Myoglobin is not effectively removed by conventional dialysis (large molecule) — dialysis is for AKI complications, not myoglobin clearance
  • Some centres use high-cut-off membranes; evidence is limited

7. Ongoing Care

  • Daily CK, U&E, calcium, phosphate, urate
  • Watch for rebound hypercalcaemia in recovery (rarely needs treatment)
  • Investigate cause (drug history, exertion, infection, inherited myopathy if recurrent)
  • Refer to nephrology if AKI stage 2/3 or recovery slow

MOST PATIENTS RECOVER. Long-term follow-up should include eGFR, ACR and BP at 3 months.

Acute Tubular Necrosis (ATN)
Related reading: Acute Tubular Necrosis (ATN).

Key practical tips

Designed for quick scanning — what to order, what to avoid, sensible portions, common mistakes.

  • Follow the NHS sick-day rules: stop ACE inhibitors, ARBs, NSAIDs and diuretics when dehydrated
  • Re-check eGFR at 3 and 6 months as NICE recommends
  • Tell every clinician you see that you have had AKI

Clinical guidance

TL;DR summary

Rhabdomyolysis releases myoglobin which precipitates in tubules and causes AKI. CK >5,000 U/L is the warning threshold. Treat with generous IV 0.9% saline aiming for urine output 200–300 mL/h, correct hyperkalaemia, exclude compartment syndrome, and consider dialysis for refractory hyperkalaemia, fluid overload or uraemia.

Key takeaways
  • CK > 5,000 U/L = AKI risk; > 15,000 U/L = high risk.
  • Aggressive isotonic IV fluids are the cornerstone of treatment.
  • Hyperkalaemia is the early life-threat.
  • Always exclude compartment syndrome in swollen, tense limbs.
  • Most survivors recover kidney function fully.
Kidney Diet & Nutrition Considerations

After acute kidney injury (AKI) the priority is recovery: rehydration, treating the underlying cause, stopping nephrotoxins and giving the kidneys a calm nutritional environment. Once eGFR is recovering, a balanced Mediterranean-style diet with sensible salt, sensible protein and good hydration supports healing — and reduces the risk of AKI tipping into long-term CKD.

Foods to prioritise

  • Adequate fluids once your team confirms it is safe (often 1.5–2 L/day)
  • Easily digested, nutrient-dense meals during recovery
  • Vegetables, fruit, oats and whole grains as appetite returns
  • Protein in modest portions — typically 0.8–1.0 g/kg/day unless advised otherwise

Foods to limit

  • NSAIDs (ibuprofen, naproxen, diclofenac) — they are nephrotoxic
  • Very salty, processed or ultra-processed foods
  • Alcohol while bloods are still recovering

Potassium, phosphate and protein needs vary between individuals — please confirm personal targets with your renal team or dietitian. Browse the Kidney Diet Hub for more guides in this cluster.

Frequently asked questions

What CK level causes acute kidney injury?

Risk of AKI rises sharply when creatine kinase (CK) exceeds 5,000 U/L, and is high above 15,000–20,000 U/L. However, CK is a marker of muscle injury, not directly nephrotoxic — myoglobin is the toxin. Patients with lower CK but profound volume depletion, sepsis or co-administered nephrotoxins can also develop AKI.

Does urinary alkalinisation help?

There is no robust randomised evidence that bicarbonate-driven urinary alkalinisation or mannitol prevents AKI better than aggressive isotonic crystalloid alone. UK practice (Renal Association/UK Kidney Association) is generous IV 0.9% saline (or Hartmann's) titrated to a urine output of 200–300 mL/h. Consider bicarbonate only if metabolic acidosis or persistent acidic urine despite adequate fluids.

When should I worry about compartment syndrome?

Any swollen, tense, exquisitely tender limb after prolonged immobilisation, crush, vascular insult, drug-induced rhabdomyolysis or post-exercise pain warrants urgent surgical review and intracompartmental pressure measurement. Missed compartment syndrome causes irreversible muscle necrosis, perpetuates rhabdomyolysis and worsens AKI.

Do most patients recover kidney function?

Yes — the majority of patients with rhabdomyolysis-AKI who survive the acute illness recover full kidney function within weeks. A minority need temporary dialysis. Long-term CKD risk is increased, particularly in older patients, those with pre-existing CKD, and those who developed multi-organ failure.

What should I eat to recover from acute kidney injury?

Most adults recovering from AKI do best on a balanced Mediterranean-style diet with adequate hydration (once your team confirms it's safe), moderate protein (around 0.8–1.0 g/kg/day), lower salt, and avoidance of NSAIDs. Your renal team will give you personalised fluid and protein targets based on your recovery.

Nutritional challenges in kidney disease

Many people living with kidney disease have to limit foods because of potassium, phosphate, diabetes, dialysis, appetite changes or simply the time it takes to cook from scratch every day. That can make it harder to keep daily nutrition balanced — particularly for vitamins and minerals that food alone may not fully cover.

Kidney Vitality is a UK-formulated daily nutritional support product designed by Consultant Nephrologist Professor Mohammed Mahdi Althaf with renal nutrition in mind from the start. It keeps doses moderate, leaves out added potassium, phosphate and magnesium, and avoids megadose vitamin A — sitting alongside a kidney-friendly diet, not replacing it.

Why Kidney Vitality fits this need

Built around UK guidance

Aligned with UK Kidney Association AKI guidance, NICE NG148 acute kidney injury, and Royal College of Emergency Medicine rhabdomyolysis standards.

Designed by a UK Consultant Nephrologist

Formulated and reviewed by Professor Mohammed Mahdi Althaf (GMC 7216325).

Practical bedside guidance

Fluid targets, hyperkalaemia algorithms and compartment syndrome triggers for emergency and acute medical teams.

Designed by a UK Consultant Nephrologist

Ready to support your kidney health?

If you have been researching kidney health, supplements, CKD nutrition or kidney-friendly living, Kidney Vitality was developed specifically around those principles by Professor Mohammed Mahdi Althaf (GMC 7216325). Nephrologist Developed Daily Multivitamin.

  • No Added Potassium
  • No Added Magnesium
  • No Added Phosphorus
  • No Added Iron
  • One capsule daily
  • UK GMP — BRCGS, NSF GMP, Halal
Subscribe & Save — £20.39/monthCheck your current multivitamin

✓ Free UK tracked delivery  ·  ✓ Delivered every 30 days  ·  ✓ Pause or cancel anytime  ·  ✓ Never run out

ComparisonKidney VitalityTypical high-street multivitamin
Added potassiumNoneOften included
Added phosphateNoneOften included (E338–E452)
Vitamin A (retinol)No megadoseOften high-dose retinol
Kidney-focused formulationYesNo — general population
Consultant Nephrologist involvementYes (GMC 7216325)No
UK GMP manufacturedYes (BRCGS, NSF GMP)Varies

Food supplement. Not a medicine and not a treatment for kidney disease. Speak with your GP, pharmacist or renal team before starting any new supplement, especially in advanced CKD, on dialysis, post-transplant, pregnant or breastfeeding.

Clinical reviewer

Professor Mohammed Mahdi Althaf

Consultant Nephrologist

Acute Physician

GMC 7216325

View Full Biography

Professor Mohammed Mahdi Althaf is a UK Consultant Nephrologist and Acute Physician with a special interest in chronic kidney disease, AKI prevention and renal nutrition. He combines hospital practice with patient education and clinical guidance review.

View professional profile →
View Credentials
  • MD
  • MSc
  • PgDip (Clin Ed)
  • FRCP
  • FHEA
  • FASN

About this article

Written for UK patients and based on:

  • NICE guidance
  • NHS resources
  • British Dietetic Association guidance
  • Kidney Care UK resources
View methodology

Each article is researched against current UK clinical guidance (NICE NG203, NG118, NG136), NHS patient resources, KDIGO and KDOQI international guidelines, and the British Dietetic Association Renal Nutrition Group. Drafts are written by the Kidney Vitality editorial team and reviewed by a UK Consultant Nephrologist before publication. Content is reviewed on a rolling basis and updated when guidance changes.

Editorial standards

  • Clinically reviewed
  • NHS-aligned
  • NICE-aligned
  • Evidence-based
  • Reviewed before publication
View full editorial process

Every article is researched and written by the Kidney Vitality editorial team using current UK clinical guidance (NICE NG203, NG118, NG136), NHS patient resources, KDIGO/KDOQI international guidelines, and British Dietetic Association renal nutrition guidance. Drafts are reviewed for clinical accuracy by Professor Mohammed Mahdi Althaf, MD, MSc, PgDip (Clin Ed), FRCP, FHEA, FASN (Consultant Nephrologist & Acute Physician, GMC 7216325) before publication. Content is updated when UK guidance changes.

References (4)View Sources
  1. NICE NG203: Chronic kidney disease — assessment and management
  2. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
  3. KDOQI Clinical Practice Guideline for Nutrition in CKD: 2020 Update
  4. British Dietetic Association — Renal Nutrition Group

Medical disclaimer

This content is educational only and does not replace personalised medical advice.

Read full disclaimer

This page is general information, not personal medical advice. If you have chronic kidney disease, are on dialysis, have had a kidney transplant, are pregnant or breastfeeding, or take prescription medication, please confirm any supplement with your GP, pharmacist or renal team before starting.

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