Overview

Oncologic emergencies are acute, potentially fatal complications of the cancer itself or its treatment. Four high-yield patterns dominate NCLEX: superior vena cava (SVC) syndrome from tumor compression obstructing upper-body venous return; tumor lysis syndrome (TLS) from rapid cancer-cell destruction after chemotherapy; spinal cord compression from vertebral metastasis; and hypercalcemia of malignancy. Each has a recognizable fingerprint, and the nurse's priority is to recognize the pattern and escalate immediately.

Interpretation

Match the fingerprint to the emergency. TLS is a lab pattern; SVC syndrome and spinal cord compression are clinical pictures; hypercalcemia of malignancy is a high calcium with neuro and organ signs. The TLS cascade below shows how rapid cell death drives the lethal endpoints of kidney injury and dysrhythmia.

Tumor lysis cascade

Rapid cancer-cell deathAfter chemo in high-tumor-burden cancer
Intracellular contents releasedHyperkalemia, hyperphosphatemia, hyperuricemia, hypocalcemia
Acute kidney injury + cardiac dysrhythmiasLethal endpoints

During — Monitoring

Serum potassiumK+ rising / > 6.0 mEq/L

Hyperkalemia is the most immediately lethal TLS abnormality

Cardiac rhythm Hallmark

Peaked T waves and widened QRS signal hyperkalemia

Serum phosphorus

Serum calcium

Falls as phosphorus rises; watch for muscle cramps and twitching

Uric acid

Serum creatininerising creatinine

Rising creatinine signals tumor-lysis acute kidney injury

Motor strength and sensation

Serial neuro checks for evolving cord compression

Bladder function

New urinary retention is an autonomic red flag

Technique

Position client in high Fowler's

First action for suspected SVC syndrome to ease venous return and dyspnea

Apply supplemental oxygen

Supports SVC syndrome and respiratory distress

Give prophylactic IV hydration

Aggressive fluids protect kidneys before and during chemo in high-tumor-burden cancers

Administer allopurinol prophylactically

Given before chemo to limit uric acid formation

Administer rasburicase for established hyperuricemia

Source bowtie: used to lower markedly elevated uric acid in active TLS

Treat hyperkalemia emergently

Per source bowtie, peaked T waves with K+ 6.8 require emergent treatment

Patient Teaching

Report new or worsening back pain

Especially with known bone metastases

Report new leg weakness or trouble walking

Report new bladder or bowel changes

Report facial swelling or fullness

Report breathing that worsens when lying flat

Report muscle cramps after chemotherapy

Early clue to tumor lysis hypocalcemia and hyperkalemia

Report Nowescalate immediately

Facial edema with neck vein distension and dyspnea Hallmark

SVC syndrome; dusky face worse lying flat

New back pain with leg weakness and urinary retention Hallmark

Spinal cord compression; delay beyond 24-48 hours risks permanent paralysis

Hyperkalemia with peaked T waves after chemoK+ > 6.0 mEq/L

Tumor lysis dysrhythmia risk

Rising creatinine after chemotherapy

Tumor-lysis acute kidney injury

High calcium with new confusion

Hypercalcemia of malignancy needing aggressive IV fluids

Clinical Pearl

TLS labs go UP-UP-UP-down: Uric acid UP, Potassium UP, Phosphate UP, Calcium DOWN. If those four hit together after chemo, think tumor lysis.

Oncologic Emergencies

Overview

Interpretation

During — Monitoring

Technique

Patient Teaching

A client with lung cancer suddenly can't lie flat and their face is swollen and dusky — this isn't a chemo side effect. It's a life-threatening oncologic emergency requiring immediate intervention.

Key Distinctions

Clinical Pearl

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