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Oncological Emergencies | 마이메르시 MyMerci
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Oncological Emergencies

NCLEX Review Guide: Oncological Emergencies

Life-Threatening Oncological Emergencies

Superior Vena Cava Syndrome (SVCS)

  • SVCS occurs when the superior vena cava is compressed or obstructed by tumor growth, commonly from lung cancer or lymphoma. Classic triad includes facial swelling, neck vein distention, and upper extremity edema.
  • Emergency intervention includes elevating the head of bed, administering corticosteroids, and preparing for radiation therapy or chemotherapy to reduce tumor size.

Clinical Scenario

A 55-year-old male with lung cancer presents with facial swelling, difficulty swallowing, and prominent neck veins. Priority nursing action is to elevate HOB and notify physician immediately.

Key Points

  • Avoid invasive procedures on upper extremities
  • Monitor for respiratory distress and airway compromise
  • Prepare for emergency intubation if needed

Spinal Cord Compression

  • Spinal cord compression results from tumor growth or metastasis pressing on the spinal cord, causing neurological deficits. Early recognition is crucial as permanent paralysis can occur within hours.
  • Assessment findings include back pain (often first symptom), motor weakness, sensory changes, and bowel/bladder dysfunction progressing from bottom to top.

Memory Aid: SPINE

S - Severe back pain
P - Progressive weakness
I - Incontinence
N - Numbness/tingling
E - Emergency treatment needed

Key Points

  • High-dose corticosteroids are first-line treatment
  • Emergency radiation therapy within 24 hours
  • Maintain spinal alignment and bed rest

Tumor Lysis Syndrome (TLS)

  • TLS occurs when rapid tumor cell destruction releases intracellular contents into bloodstream, causing dangerous electrolyte imbalances. Most common with hematologic malignancies and high tumor burden.
  • Life-threatening complications include hyperkalemia (cardiac arrhythmias), hyperphosphatemia, hypocalcemia (tetany, seizures), and hyperuricemia (acute kidney injury).

TLS Laboratory Values

ElectrolyteNormalTLS FindingSymptoms
Potassium3.5-5.0↑ >6.0Cardiac arrhythmias
Phosphorus2.5-4.5↑ >6.5Kidney dysfunction
Calcium8.5-10.5↓ <7.0Tetany, seizures
Uric Acid3.5-7.0↑ >8.0Kidney stones, AKI

Key Points

  • Aggressive hydration with normal saline
  • Allopurinol or rasburicase to prevent hyperuricemia
  • Monitor cardiac rhythm continuously

Metabolic Emergencies

Hypercalcemia of Malignancy

  • Hypercalcemia (>10.5 mg/dL) occurs in 10-20% of cancer patients through bone destruction or parathyroid hormone-like substances. Symptoms worsen as calcium levels rise above 12 mg/dL.
  • Clinical manifestations follow "stones, bones, groans, and psychiatric moans" - kidney stones, bone pain, GI symptoms, and altered mental status.

    Treatment Protocol

  1. Aggressive IV hydration with normal saline (200-300 mL/hr)
  2. Administer loop diuretics (furosemide) after adequate hydration
  3. Bisphosphonates (pamidronate) for severe cases
  4. Monitor for fluid overload and electrolyte imbalances

Key Points

  • Thiazide diuretics are contraindicated (increase calcium)
  • Monitor cardiac rhythm - calcium affects contractility
  • Calcitonin provides rapid but temporary relief

Syndrome of Inappropriate ADH (SIADH)

  • SIADH causes excessive water retention and dilutional hyponatremia (<135 mEq/L), commonly associated with lung cancers and brain tumors. Serum osmolality decreases while urine osmolality increases inappropriately.
  • Severe hyponatremia (<120 mEq/L) can cause cerebral edema, seizures, coma, and death if not corrected carefully.

Memory Aid: SIADH

S - Serum sodium LOW
I - Intake restriction
A - ADH excess
D - Diuretics (demeclocycline)
H - Hypertonic saline for severe cases

Key Points

  • Fluid restriction 800-1000 mL/day for mild cases
  • Correct sodium slowly (0.5-1 mEq/L/hr) to prevent central pontine myelinolysis
  • Daily weights and strict I&O monitoring essential

Study Tips & Common Pitfalls

Commonly Confused Oncological Emergencies

EmergencyKey Distinguishing FeaturePriority Intervention
SVCSUpper body swelling, neck veinsElevate HOB, avoid upper extremity procedures
Spinal CompressionProgressive weakness, back painHigh-dose steroids, maintain alignment
TLSHigh K+, high phosphorus, low Ca2+Aggressive hydration, allopurinol
Hypercalcemia"Stones, bones, groans, moans"IV fluids, then loop diuretics

Quick Assessment Priorities

ABC's FIRST: Airway (SVCS), Breathing (spinal compression), Circulation (TLS arrhythmias)
Then address: Neurological status, Pain level, Laboratory values

⚠️ Common Pitfalls to Avoid

  • Never give thiazide diuretics in hypercalcemia - they increase calcium retention
  • Don't correct hyponatremia too rapidly - risk of central pontine myelinolysis
  • Avoid invasive procedures on upper extremities in SVCS patients
  • Always check potassium before giving digoxin in TLS patients

✓ Self-Assessment Checklist

I can identify the classic signs of each oncological emergency
I understand the pathophysiology behind each condition
I know the priority nursing interventions for each emergency
I can differentiate between similar presenting symptoms
I understand medication contraindications and interactions

🌟 Remember: Early recognition and prompt intervention save lives in oncological emergencies. Trust your assessment skills and advocate for your patients. You've got this, future nurse! 🌟

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