Oncologic Emergencies - Clinical Medicine

Master the recognition and management of life-threatening oncologic emergencies through this comprehensive clinical medicine lecture covering eight critical conditions that require immediate intervention. Begin with neutropenic fever, understanding chemotherapy-induced immunosuppression pathophysiology, diagnostic criteria, and the urgent need for empiric broad-spectrum antibiotic therapy. Explore tumor lysis syndrome's massive cellular breakdown mechanism, resulting electrolyte imbalances including hyperkalemia, hyperphosphatemia, and hypocalcemia, plus acute kidney injury risks, while learning preventive strategies using hydration, allopurinol, and rasburicase. Examine leukostasis and its hyperleukocytosis-induced microvascular perfusion impairment, recognizing respiratory and neurologic manifestations, and implementing urgent cytoreductive therapy with hydroxyurea and leukapheresis. Study superior vena cava syndrome's classic presentation of facial swelling, venous distention, and dyspnea caused by mediastinal tumor obstruction, following systematic diagnostic imaging and oncologic intervention approaches. Analyze malignant spinal cord compression through red-flag symptoms including back pain, weakness, sensory changes, and bowel/bladder dysfunction, utilizing MRI diagnostics and immediate high-dose steroid, radiation, or surgical management. Investigate hypercalcemia of malignancy as the most common metabolic cancer emergency, caused by PTHrP secretion, bone metastases, or excess vitamin D production, presenting with confusion, constipation, and polyuria, treated with IV fluids, bisphosphonates, and calcitonin. Conclude with malignant cardiac tamponade's pericardial fluid accumulation pathophysiology restricting cardiac output, identifying hypotension, jugular venous distention, and muffled heart sounds requiring life-saving pericardiocentesis intervention.