Emergency Medicine Hub / Hematology & Oncology • 3 min read • 3 sections

Oncologic Emergencies, Febrile Neutropenia & Tumor Lysis Syndrome

Comprehensive emergency protocol for life-threatening oncologic crises: the 60-minute antibiotic bundle in febrile neutropenia, immediate high-dose dexamethasone in malignant spinal cord compression (MSCC), clinical staging and stenting in Superior Vena Cava (SVC) syndrome, and rasburicase vs. aggressive hydration in Tumor Lysis Syndrome (TLS).

Resuscitation Quick Actions • First 2 Minutes

High-Acuity

60-Minute Neutropenic Bundle

ANC < 500 + Temp >= 38.3°C -> Administer Cefepime 2g IV or Zosyn 4.5g IV within 60 minutes of ED arrival

Never Perform DRE

Digital rectal exams and rectal thermometers are strictly prohibited in neutropenia (causes bacteremic mucosal translocation)

Cord Compression Steroid Bolus

Give Dexamethasone 10-16 mg IV bolus immediately upon clinical suspicion before total-spine MRI

Cairo-Bishop TLS Criteria

Hyperuricemia (> 8), Hyperkalemia (> 6), Hyperphosphatemia (> 4.5), and Hypocalcemia (< 7); start Rasburicase

Rasburicase G6PD Warning

Rasburicase produces hydrogen peroxide; strictly contraindicated in G6PD deficiency (triggers methemoglobinemia and severe hemolysis)

Bottom-Line Clinical Pearl

In malignant spinal cord compression (MSCC), administer high-dose IV Dexamethasone (10-16 mg bolus) immediately upon clinical suspicion before transporting the patient to the MRI scanner; motor recovery is strictly determined by neurologic function at the time therapy begins. In febrile neutropenia, door-to-needle time for broad-spectrum antipseudomonal monotherapy must be under 60 minutes, and digital rectal exams are strictly contraindicated.

1. Febrile Neutropenia: The 60-Minute Emergency Antibiotic Protocol

Febrile neutropenia is a medical emergency defined by: 1) An Absolute Neutrophil Count (ANC) < 500 cells/mcL (or < 1,000 cells/mcL with an anticipated decline to < 500 over the next 48 hours), PLUS 2) A single oral temperature >= 38.3°C (101°F) or a sustained temperature >= 38.0°C (100.4°F) for > 1 hour. Mortality increases by 8% for every hour of delay to empiric antimicrobial administration:

Clinical Component	Recommended Intervention & Dosing	Clinical Rules & Contraindications
First-Line Empiric Monotherapy (DOOR-TO-ANTIBIOTIC < 60 MIN)	Administer single-agent IV Antipseudomonal Beta-Lactam: 1. Cefepime 2.0g IV q8h (preferred) OR 2. Piperacillin-Tazobactam (Zosyn) 4.5g IV q6h OR 3. Meropenem 1.0g IV q8h (if severe penicillin anaphylaxis or ESBL history).	Covers virulent enteric gram-negative bacilli and Pseudomonas aeruginosa. Ceftriaxone and Ciprofloxacin are strictly inadequate due to lack of reliable antipseudomonal activity.
Specific Indications for Adding Vancomycin	Add Vancomycin (15-20 mg/kg IV targeting trough 15-20 mcg/mL) ONLY if: - Hemodynamic instability/septic shock - Clinical suspicion of catheter-related central line infection - Known MRSA colonization - Apparent skin or soft tissue infection - Severe oral mucositis.	Do NOT add vancomycin routinely for all febrile neutropenic patients (increases nephrotoxicity without survival benefit).
Physical Examination Hazards	Perform detailed examination of indwelling vascular catheter sites, oral mucosa, and perianal region.	THE STRICT DIGITAL RECTAL EXAM (DRE) PROHIBITION: Never perform a digital rectal examination, rectal temperature check, or enema. The neutropenic anorectal mucosa is fragile; physical trauma creates mucosal tears, facilitating direct translocation of enteric flora into the pelvic venous plexus and rapid bacteremic shock.

2. Malignant Spinal Cord Compression (MSCC) & SVC Syndrome

Malignant Spinal Cord Compression occurs in 5-10% of advanced cancer patients (most commonly lung, breast, prostate, renal cell, and multiple myeloma). Metastases expand within the epidural space, collapsing the epidural venous plexus and causing spinal cord ischemia and permanent paralysis:

Oncologic Crisis	Clinical Presentation & Diagnosis	Immediate Emergency Intervention
Malignant Spinal Cord Compression (MSCC)	1. Progressive localized, unremitting back pain (worse supine, worse with Valsalva/coughing; precedes neuro deficits by weeks). 2. Motor weakness (hyperreflexia, upgoing toes, lower extremity spasticity). 3. Sensory level dermatomal band. 4. Late: Cauda equina syndrome (urinary retention/post-void residual > 200 mL, saddle anesthesia, lax anal tone).	1. STAT HIGH-DOSE STEROIDS: Administer Dexamethasone 10 to 16 mg IV bolus immediately, followed by 4-8 mg IV every 6 hours (reduces vasogenic spinal cord edema). 2. TOTAL SPINE MRI: Urgent sagittal and axial T1/T2 with contrast of the ENTIRE spine (cervical, thoracic, lumbar; 20-30% have non-contiguous skip lesions). 3. Emergent Neurosurgery/Radiation Oncology Consult: Surgical decompressive laminectomy + stabilization within 24 hours preserves ambulation.
Superior Vena Cava (SVC) Syndrome	Extrinsic compression or catheter-related thrombosis of the SVC (small cell lung cancer, non-small cell lung cancer, lymphoma). - Dyspnea, orthopnea, hoarseness, stridor - Facial fullness, periorbital edema, conjunctival injection - Dilated superficial collateral veins on anterior chest wall - Pemberton's Sign: Facial plethora, cyanosis, and inspiratory stridor upon raising both arms above head for 1 minute.	Emergency Management: 1. Elevate head of bed to 45° (reduces intracranial and upper airway hydrostatic pressure). 2. Oxygen therapy. 3. Dexamethasone 10-20 mg IV (rapidly shrinks steroid-responsive lymphoma/thymoma). 4. Contrast CT Chest (evaluates tracheal compression and thrombus). 5. Interventional Radiology for urgent endovascular stent placement.

3. Tumor Lysis Syndrome (TLS): The Cairo-Bishop Diagnostic Criteria

Tumor Lysis Syndrome is an oncologic metabolic catastrophe triggered by the massive, spontaneous or chemotherapy-induced necrosis of malignant cells (classically in high-grade lymphomas like Burkitt lymphoma and acute leukemias). Rapid intracellular release of nucleic acids, potassium, and phosphate overwhelms renal clearance capacity:

Metabolic Abnormality	Cairo-Bishop Laboratory Threshold	Pathophysiologic Mechanism & Emergency Pharmacotherapy
Hyperuricemia	Uric Acid >= 8.0 mg/dL (or 25% increase from baseline)	Purine catabolism produces insoluble uric acid, which precipitates in acidic renal tubules causing acute obstructive crystal nephropathy. Rasburicase (Recombinant Urate Oxidase): 0.2 mg/kg IV (or fixed dose 3 to 6 mg IV single infusion). Enzymatically cleaves uric acid into allantoin (5-10x more water-soluble than uric acid, rapidly excreted in urine). Drops uric acid levels to near-zero within 4 hours! Note: Allopurinol blocks new synthesis but cannot degrade existing uric acid.
Hyperkalemia	Potassium >= 6.0 mEq/L (or 25% increase from baseline)	Massive cell lysis releases intracellular potassium, producing fatal ventricular dysrhythmias and asystole. Aggressive cardiac membrane stabilization with IV Calcium Gluconate (30 mL) and shifting with Insulin/Glucose + Albuterol. Emergent hemodialysis if refractory.
Hyperphosphatemia & Hypocalcemia	Phosphate >= 4.5 mg/dL (children >= 6.5 mg/dL) Calcium <= 7.0 mg/dL (ionized < 1.12 mmol/L)	Malignant cells contain 4x higher intracellular phosphate. Excess phosphate binds ionized calcium, forming calcium phosphate crystals that precipitate in renal tubules and cardiac conduction system, triggering tetany, seizures, prolonged QT, and acute renal failure. CAUTION WITH CALCIUM: Do NOT treat hypocalcemia with IV calcium unless the patient has tetany or life-threatening ECG changes; exogenous calcium fuels massive systemic calcium-phosphate precipitation!

Malignant Spinal Cord Compression: Never Delay High-Dose Steroids for MRI

Malignant Spinal Cord Compression is a neurological emergency where neurological recovery is strictly determined by functional status at the time treatment begins. Over 80% of patients who are ambulatory when treatment starts remain ambulatory; conversely, fewer than 10% of patients who develop complete paraplegia regain the ability to walk. If an oncology patient develops new localized spine tenderness with lower extremity weakness, hyperreflexia, or sensory level changes, administer Dexamethasone 10 to 16 mg IV immediately. Never delay steroid administration while waiting for transport, IV contrast, or scheduling of the MRI scanner. Order an urgent MRI of the ENTIRE spine (cervical, thoracic, and lumbar), and contact Spine Surgery and Radiation Oncology immediately.

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