A 24-year-old man is admitted to the hospital with newly diagnosed Burkitt lymphoma. He has a massive abdominal mass and significant cervical lymphadenopathy. Temperature is 37.2°C (99.0°F), blood pressure is 120/78 mmHg, heart rate is 88/min, and respiratory rate is 16/min. Initial laboratory studies show:
| Laboratory Parameter | Result |
|---|---|
| Leukocyte count | 12,500/mm³ |
| Hemoglobin | 13.2 g/dL |
| Platelet count | 210,000/mm³ |
| Serum creatinine | 0.9 mg/dL |
| Serum uric acid | 7.8 mg/dL |
| Serum potassium | 4.2 mEq/L |
| Serum phosphorus | 3.8 mg/dL |
| Serum calcium | 9.2 mg/dL |
The patient is scheduled to receive intensive, multi-agent cytotoxic induction chemotherapy. Arrange the following interventions in the most appropriate chronological sequence for the prophylaxis and subsequent step-wise management of tumor lysis syndrome in this patient.
- 1Initiate aggressive intravenous normal saline hydration and allopurinol.
- 2Administer the scheduled cytotoxic induction chemotherapy regimen.
- 3Perform intensive laboratory monitoring of electrolytes, uric acid, and creatinine every 4 to 6 hours.
- 4Administer rasburicase for rapidly rising uric acid levels indicating early clinical tumor lysis syndrome.
- 5Initiate emergent hemodialysis for severe, refractory hyperkalemia and acute oliguric renal failure.
Cevap
The correct chronological sequence is: 1. Initiate hydration and allopurinol, 2. Administer chemotherapy, 3. Perform intensive laboratory monitoring, 4. Administer rasburicase for rising uric acid, 5. Initiate hemodialysis for refractory renal failure.
The correct sequence for managing a patient at high risk for tumor lysis syndrome (TLS) begins with absolute prevention. Aggressive intravenous hydration and allopurinol must be initiated prior to chemotherapy to establish high urine flow and prevent initial uric acid formation. Once this prophylaxis is firmly established, the inciting cytotoxic chemotherapy can be safely administered. Following chemotherapy, intensive laboratory monitoring (every 4-6 hours) is crucial to rapidly detect early signs of TLS. If uric acid levels rise significantly despite initial prophylaxis, escalating medical management with rasburicase is administered to rapidly clear existing uric acid. Finally, if life-threatening electrolyte abnormalities like refractory hyperkalemia or acute renal failure occur despite all medical management, emergent hemodialysis is required as the definitive rescue therapy.
Adım Adım Çözüm
Anahtar Kavram
The management of Tumor Lysis Syndrome (TLS) follows a strict chronological protocol: prophylaxis (hydration and allopurinol), inciting event (chemotherapy), intensive surveillance, escalating medical management (rasburicase), and finally rescue therapy (hemodialysis).
Tahmini Süre:1m 30s