Guide — Oncology
Oncologic Emergencies
Oncologic emergencies are life-threatening complications of cancer or its treatment that require immediate recognition and intervention. Early nursing identification determines whether the patient survives or sustains permanent injury. This guide covers tumor lysis syndrome, spinal cord compression, superior vena cava syndrome, hypercalcemia of malignancy, and febrile neutropenia.
12 min read · Oncology
Educational use only. This content is intended for nursing students and exam preparation. Oncologic emergencies require immediate provider notification and institutional emergency protocols. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Tumor Lysis Syndrome (TLS)
Pathophysiology: Rapid cancer cell death (spontaneous or treatment-induced) releases massive amounts of intracellular contents — potassium, phosphate, and uric acid — into circulation. This overwhelms normal homeostatic mechanisms, causing a cascade of metabolic derangements.
Highest risk tumors: Burkitt lymphoma (highest risk), ALL (acute lymphoblastic leukemia), large-volume AML, diffuse large B-cell lymphoma. Solid tumors with large tumor burden or highly chemo-sensitive disease.
| Lab Abnormality | Value | Clinical Consequence | Treatment |
|---|---|---|---|
| Hyperkalemia | >5.5 mEq/L | Cardiac dysrhythmias (peaked T waves, wide QRS, VF/VT), muscle weakness, paralysis | Calcium gluconate (cardiac protection), insulin/dextrose, sodium bicarbonate, kayexalate, dialysis |
| Hyperphosphatemia | >4.5 mg/dL | Hypocalcemia (phosphate binds calcium), renal damage, soft tissue calcification | Phosphate binders, dietary restriction, dialysis |
| Hyperuricemia | >8 mg/dL | Uric acid crystals deposit in renal tubules → acute kidney injury | Allopurinol (xanthine oxidase inhibitor — prevention), rasburicase (recombinant urate oxidase — breaks down existing uric acid), IV hydration |
| Hypocalcemia | <7.0 mg/dL | Tetany, Chvostek's sign, Trousseau's sign, seizures, cardiac dysrhythmias, QT prolongation | Calcium gluconate (only for symptomatic hypocalcemia — treating underlying hyperphosphatemia is priority) |
Nursing Priorities for TLS
- ✦Aggressive IV hydration (2–3 L/m²/day or 200 mL/hr NS) to increase urine output and dilute metabolites
- ✦Strict intake and output — goal urine output ≥100 mL/hr; Foley catheter
- ✦Continuous cardiac monitoring — ECG changes from hyperkalemia can be immediately life-threatening
- ✦Labs every 4–6 hours: potassium, phosphorus, uric acid, calcium, BUN, creatinine, CBC
- ✦Administer allopurinol (prevention) or rasburicase (treatment) per order
- ✦Hold diuretics that can worsen uric acid precipitation (avoid furosemide without adequate hydration)
- ✦Daily weights; monitor for volume overload from aggressive hydration
Malignant Spinal Cord Compression (SCC)
Mechanism: Tumor growth (vertebral metastasis or direct extension) compresses the spinal cord or cauda equina. Most common in the thoracic spine. Causes: breast, lung, prostate, myeloma, lymphoma are the most frequent primary tumors.
Cardinal symptom: Back pain — typically precedes neurological deficits by days to weeks. Any cancer patient with new back pain should be evaluated for SCC.
| Feature | Details |
|---|---|
| Clinical presentation | Back pain (usually first symptom), extremity weakness, sensory deficits (numbness/tingling), bowel/bladder dysfunction (late and ominous sign — indicates severe compression) |
| Diagnosis | MRI spine is gold standard. Plain X-rays or CT may show vertebral metastasis but cannot evaluate cord compression directly. |
| Emergency indicators | New or rapidly worsening weakness, bowel or bladder incontinence, or paraplegia — neurological deficits can be permanent if not treated within hours |
| Medical treatment | Dexamethasone (high-dose corticosteroid — reduces edema, preserves function): given STAT once SCC is suspected, before MRI if neurological deficits present. Radiation therapy (definitive treatment). Surgery if instability or failure of radiation. |
| Nursing priorities | Immobilize spine — log-roll technique for all repositioning. Bowel and bladder management. Skin integrity for immobile patients. Pain management. Psychological support. Fall precautions. |
Superior Vena Cava Syndrome (SVCS)
| Mechanism | Compression or obstruction of the SVC — usually by an intrathoracic mass (most commonly lung cancer or mediastinal lymphoma). Reduced venous return from the head, neck, and upper extremities. |
| Classic presentation | Facial and neck swelling (plethora), upper extremity edema, prominent chest and neck veins (collateral circulation), dyspnea, cough, dysphagia, headache worsened by bending forward. Symptoms worsen when supine. |
| Life-threatening features | Cerebral edema → altered mental status, seizures. Laryngeal edema → airway compromise. These require immediate intervention. |
| Diagnosis | CT chest with contrast (shows mediastinal mass and SVC obstruction). Biopsy of accessible tissue to identify histology. |
| Treatment | Radiation therapy (urgent if life-threatening). Chemotherapy for chemo-sensitive tumors (lymphoma). Endovascular stenting for rapid relief. Corticosteroids to reduce edema. |
| Nursing priorities | Elevate head of bed 30–45 degrees — reduces venous congestion in the head/neck. No BP measurements or IVs in the upper extremities (impaired venous return). Airway monitoring. Minimize activities that increase intrathoracic pressure (Valsalva, coughing). Monitor for AMS. |
Hypercalcemia of Malignancy
| Prevalence | Most common metabolic emergency in cancer — affects 10–30% of all cancer patients at some point |
| Mechanisms | Humoral (PTHrP — parathyroid hormone-related protein): most common; tumors secrete PTHrP which mimics PTH → osteoclast activation → bone resorption. Bone metastasis: direct osteolysis by tumor or tumor-stimulated osteoclasts. Vitamin D excess: granulomatous tumors (lymphoma) convert to active vitamin D. |
| Most common cancers | Breast cancer (most common), multiple myeloma, lung cancer (squamous cell), renal cell carcinoma, head and neck cancers |
| Clinical features (BONES, GROANS, MOANS, STONES) | Bones: bone pain, pathologic fracture. Groans: nausea, vomiting, constipation, anorexia, pancreatitis. Moans: fatigue, weakness, depression, confusion, AMS, coma. Stones: nephrolithiasis, polyuria, polydipsia, renal failure. |
| Diagnostic calcium level | Mild: 10.5–12 mg/dL; Moderate: 12–14 mg/dL (symptomatic); Severe: >14 mg/dL (emergency — AMS, coma, cardiac arrhythmia) |
| Treatment | IV hydration (NS — the cornerstone; dilutes calcium and promotes renal excretion). Loop diuretics (furosemide — after adequate hydration to promote calciuresis). Bisphosphonates (zoledronic acid — inhibit osteoclast activity; effect takes 2–4 days). Calcitonin (rapid effect within hours; tachyphylaxis after 48–72 hrs). Denosumab (RANK-L inhibitor) for refractory cases. |
| Nursing priorities | Aggressive IV hydration with NS. Strict I&O, daily weights. Cardiac monitoring for QT prolongation. Neurological assessment — AMS can progress to coma. Fall precautions (weakness, confusion). Encourage mobility (immobility worsens hypercalcemia). Avoid thiazide diuretics (increase calcium reabsorption). |
Febrile Neutropenia
Definition: Oncologic Emergency
Fever ≥38.3°C (101°F) once, OR ≥38°C (100.4°F) for ≥1 hour, AND ANC <500 cells/mm³ (or expected to fall below 500).
- !Blood cultures × 2 (peripheral + central if CVAD present) BEFORE antibiotics — do not delay antibiotics more than 30–60 minutes to obtain cultures
- !Broad-spectrum IV antibiotics within 60 minutes of identification (Pseudomonas coverage essential)
- !Assess for source: lungs, skin, lines, oral mucosa, perirectal area (NO rectal temps or rectal exams in neutropenic patients)
- !Maintain neutropenic precautions: private room, HEPA filtration if available, strict hand hygiene, visitor screening
- !Mortality risk increases significantly with every hour of antibiotic delay
NCLEX Pearls — Oncologic Emergencies
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with Oncology Nursing Society (ONS) · National Comprehensive Cancer Network (NCCN) · American Society of Clinical Oncology (ASCO). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →