Clinical Analysis: Mr. Aryan Pujari, 26-year-old Male

Critical Lab Values (from the report)

Diagnosis: RHABDOMYOLYSIS with Myoglobinuria

1. Orangish/tea-colored urine - this is myoglobinuria. Myoglobin, released from lysed muscle cells, appears in urine when plasma myoglobin exceeds 100-300 mg/L, manifesting as tea-colored or brown-orange urine. A urine dipstick will test positive for blood with few or no RBCs on microscopy - this distinguishes myoglobinuria from hematuria.
2. Massively elevated CK >42,670 U/L - this is the most reliable diagnostic marker for rhabdomyolysis. The lab has flagged this as a Critical High value (>213x upper limit of normal).
3. Markedly elevated transaminases (AST 2226, ALT 493) - in rhabdomyolysis, AST rises disproportionately to ALT because AST is present in both liver AND skeletal muscle. The AST:ALT ratio of ~4.5:1 seen here is characteristic of muscle injury rather than primary liver disease. (In hepatocellular damage from hepatitis, AST:ALT is typically close to 1:1 or the ALT may exceed AST.)

Pathophysiology

• Tubular obstruction - myoglobin complexes with Tamm-Horsfall protein forming pigmented granular casts that block distal tubules
• Direct tubular toxicity - myoglobin's iron (Fe²+) generates hydroxyl radicals via the Fenton reaction, causing lipid peroxidation and oxidant injury to proximal tubule cells
• Renal vasoconstriction - volume depletion from fluid sequestration into necrotic muscle activates RAS, SNS, and ADH, reducing GFR

Likely Causes to Investigate in a 26-Year-Old Male

Urgent Workup Needed

• Renal function: Serum creatinine, BUN, eGFR, electrolytes (look for hyperkalemia, hyperphosphatemia, hypocalcemia - the classic triad)
• Urine: Dipstick (positive for blood despite no/few RBCs), myoglobin casts, urinalysis
• Urine output monitoring - oliguria = early AKI
• ECG - for hyperkalemia-related arrhythmias
• LDH, uric acid, coagulation panel (DIC screen if severe)
• Blood glucose, TFTs, electrolyte panel
• History: Exercise, substance use, medications (statins, antipsychotics), trauma, fever, viral illness

Management (Emergency)

• Normal saline (0.9% NaCl) initially: 1-1.5 L/hour until urine output reaches 200-300 mL/hr
• Target urine output: 200-300 mL/hour
• Volume expansion increases renal blood flow, GFR, and dilutes myoglobin in tubules

• Hyperkalemia: treat aggressively (calcium gluconate for cardiac protection, insulin/dextrose, sodium bicarbonate, Kayexalate, dialysis if refractory)
• Hypocalcemia: treat only if symptomatic (do NOT give empiric calcium - can worsen muscle calcification)

• Sodium bicarbonate to raise urine pH >6.5 may reduce myoglobin cast formation and tubular toxicity, but evidence is mixed

• Uncorrectable metabolic acidosis
• Life-threatening hyperkalemia refractory to medical management
• Uremia with oliguria/anuria despite fluid expansion

Red Flags Requiring ICU Admission

• Hemodynamic instability
• Hyperkalemia (K+ >6.5 mEq/L) with ECG changes
• Oliguria/anuria despite fluids
• Evidence of DIC
• CK not trending down with treatment

Prognosis

Specialist Consultations for This Case

🔴 Primary / Most Urgent

• Highest priority - AKI from myoglobinuria is the most life-threatening complication
• Will guide aggressive fluid management, monitor renal function trajectory, and decide if dialysis/RRT is needed
• CK >40,000 in a 26-year-old with orangish urine = nephrology consult should happen within hours

🟠 Essential Secondary Consults

• Coordinates overall care and admission
• Manages electrolyte abnormalities (hyperkalemia, hypocalcemia, hyperphosphatemia)
• Oversees fluid resuscitation protocol
• If not already in a hospital, this is the team that admits and manages the case

• First point of contact for stabilization
• Initiates IV fluids, ECG monitoring, and urgent labs before specialist handover

🟡 Situational Consults (Based on Etiology Found)

🔵 Regarding the AST/ALT

Summary Priority Order

1. Nephrology (urgent - AKI prevention/management)
2. Internal Medicine (admission, overall coordination)
3. Etiology-directed specialist (once cause identified)

Clinical Interpretation: Urine Normalized + KFT Normal

What This Tells You

What to Do Now

Continue Monitoring (Do NOT discharge yet)

• CK should trend downward with each reading
• If CK is still rising, muscle injury is ongoing - investigate further
• Target: CK trending down toward <5,000 U/L before considering discharge

• A single normal KFT is reassuring but not sufficient
• Myoglobin can continue to be released for days if cause is not eliminated
• Renal function can deteriorate even after initial normalization

• Potassium (K+) - watch for late hyperkalemia
• Phosphate, calcium - monitor for shifts

Shift Focus: Find the Cause

• Recurrent rhabdomyolysis can cause cumulative renal damage
• An inherited metabolic myopathy (McArdle disease, CPT-II deficiency) could be missed if not investigated
• A reversible/treatable cause (drug, infection, inflammatory) must be identified and eliminated

Ask specifically:

• Any intense exercise or physical activity in the 24-72 hours before?
• Any drugs - prescription, OTC, recreational (cocaine, MDMA, amphetamines, alcohol)?
• Any fever, viral illness, muscle pain in the days before?
• Any family history of similar episodes or muscle disease?
• Any medications started recently (statins, antipsychotics)?
• Was this a first episode or has it happened before?

Discharge Criteria (when safe to discharge)

• CK trending clearly downward (does not need to be normal, but falling)
• KFT consistently normal on repeat testing
• Urine remains clear
• Electrolytes stable
• Underlying cause identified and addressed
• No muscle compartment syndrome signs (limb swelling, pain out of proportion)

Bottom Line

1. Serial CK trending to confirm ongoing improvement
2. Identifying the cause to prevent recurrence
3. Outpatient follow-up with nephrology or internal medicine once safely discharged

Dietary Recommendations: Rhabdomyolysis Recovery

Phase 1 - Acute Recovery (While Still Admitted / First 3-5 Days)

🥤 Fluids - Most Important Component

🥩 Protein - Moderate, Not High

• Do NOT push high protein during acute phase - even with normal KFT, the kidneys are under metabolic stress
• Aim for 0.8-1.0 g/kg/day (normal maintenance level) - approximately 60-80g protein/day for a typical adult male
• Best sources: eggs, lean chicken, fish, low-fat dairy, lentils, tofu
• Avoid: protein supplements, whey shakes, creatine supplements - these increase nitrogen load on kidneys and can worsen uric acid production

CK elevation releases large amounts of purines from muscle nucleic acids, leading to hyperuricemia. High-protein/purine foods worsen this.

🫀 Potassium - Moderate Caution

• Bananas, oranges, kiwi, avocado
• Potatoes, tomatoes, spinach, beans
• Salt substitutes (contain KCl)
• Coconut water in excess (high K+)

🦴 Phosphate - Mild Restriction

• Processed foods, cola drinks, packaged snacks (contain phosphate additives)
• Red meat in large amounts
• Nuts and seeds in excess

🧂 Sodium - Normal to Slightly Liberal

Phase 2 - Recovery at Home (After Discharge, Weeks 1-4)

✅ Encourage

❌ Avoid / Restrict Long-Term

Special Consideration: If Cause Was Exertional

• No exercise at all for at least 2-4 weeks until CK normalizes
• When returning to exercise: gradual progressive loading only - no sudden intense sessions
• Pre-exercise hydration is essential going forward
• Avoid exercising in hot weather or while unwell

Summary Card

DRINK:   3+ litres of water daily - pale urine is the goal
EAT:     Moderate lean protein, complex carbs, antioxidant vegetables
LIMIT:   High-potassium and high-phosphate foods (short-term)
AVOID:   Alcohol, energy drinks, protein supplements, creatine
STOP:    All intense exercise until CK normalized
FOLLOW:  Repeat CK and KFT in 1-2 weeks after discharge