A client received high-dose methotrexate 24 hours ago. The n… | MyMerci
Medical Emergencies PA
Question

A client received high-dose methotrexate 24 hours ago. The nurse notes urine pH 6.5 and methotrexate level still elevated. Which is the priority nursing intervention?

Explanation
Correct (2): High-dose MTX requires leucovorin (folinic acid) rescue to prevent severe myelosuppression and mucositis. Urine alkalinization (pH >7) with IV bicarbonate increases MTX solubility and prevents tubular precipitation/AKI. Continue until MTX level

In-depth explanation

Memory Tip Methotrexate = "MTX folate antagonist". Rescue = LEUCOVORIN (folinic acid). Alkalinize urine pH >7. Caution Glucarpidase enzymatically inactivates MTX in toxic levels.

Clinical scenario

Scenario 14-year-old with osteosarcoma 24h post high-dose methotrexate; urine pH 6.5, MTX level still elevated. Leucovorin rescue ongoing.

Key concepts

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