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Tumour Lysis Syndrome — SCE Medical Oncology MCQ

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HardOncological EmergenciesTumour Lysis SyndromeSCE Medical Oncology

Twenty-four hours after chemotherapy for bulky high-grade lymphoma, a patient has potassium 6.9 mmol/L with broad QRS complexes, phosphate 2.6 mmol/L, corrected calcium 1.72 mmol/L, urate 910 micromol/L and oliguric AKI. What is the best immediate management bundle?

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Correct answer: AImmediate hyperkalaemia protocol with ECG monitoring, intravenous hydration, rasburicase and early renal-support planning

This is established clinical tumour lysis syndrome with immediately dangerous hyperkalaemia and AKI. Cardiac stabilisation and potassium-lowering therapy cannot wait; concurrent hydration and rapid urate reduction with rasburicase are urgent, with early renal-support planning. Calcium is used for membrane stabilisation when indicated but asymptomatic hypocalcaemia itself should not be routinely corrected because calcium-phosphate precipitation may worsen.

Reference: NHS England patient safety alert: delayed rasburicase for tumour lysis syndrome (Published June 2025): https://www.england.nhs.uk/long-read/harm-from-delayed-administration-of-rasburicase-for-tumour-lysis-syndrome-natpsa-2025-005-nhsps/