1 MCQs in Medicine for NEET PG
A 64-year-old man on maintenance hemodialysis presents to the emergency department with severe weakness, palpitations, and near-syncope. He missed his last two dialysis sessions. Serum potassium is 8.4 mEq/L. The 12-lead ECG shows loss of P waves, progressive QRS widening (>200 ms), and blending of the QRS complex with the T wave to form a characteristic **sine wave** morphology, as marked **A** in the diagram. Blood pressure is 80/40 mm Hg. Which of the following is the most appropriate IMMEDIATE first-line intervention?
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