Chronic Kidney Disease Undergoes in Medicine / Internal Medicine — 33yo Man | Nephrology | SMLE Q#17868

SMLE Question #17868

Medicine / Internal Medicine Nephrology

Objective: OBJ-IM-NEPH-HYPERK-001

Last updated: February 2026
A 33-year-old man with chronic kidney disease undergoes an uncomplicated appendectomy. On postoperative day 1, he develops sudden palpitations and generalized weakness. He is alert and oriented. ECG shows tall peaked T waves, QRS widening, and absent P waves. What is the most appropriate initial step in management?

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