Hyperkalemia in a Dialysis Patient
A 65-year-old man on maintenance hemodialysis for 5 years presents with weakness and palpitations. He missed his last dialysis session. ECG shows peaked T waves and widened QRS. Labs: K 7.8 mEq/L, Na 135 mEq/L, HCO3 18 mEq/L, BUN 80 mg/dL, creatinine 8.5 mg/dL, glucose 150 mg/dL. He is on a potassium-restricted diet but admits to eating bananas and oranges. His medications include lisinopril 10 mg daily, carvedilol 6.25 mg BID, and sevelamer 800 mg TID with meals.
1. What is the immediate management of his hyperkalemia?
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Immediate management of hyperkalemia with ECG changes: 1) IV calcium gluconate to stabilize cardiac membrane (does not lower K). 2) Insulin with glucose to shift K intracellularly. 3) Beta-2 agonist (albuterol) nebulized. 4) Sodium bicarbonate if metabolic acidosis. 5) Emergent dialysis. Also, stop lisinopril and potassium-containing foods. Since he is on dialysis, emergent hemodialysis is definitive. The order: calcium first, then insulin/glucose, then dialysis. Also, consider diuretics? Not useful in ESRD. Kayexalate? Not immediate. So immediate: IV calcium, insulin/glucose, albuterol, and arrange urgent dialysis.
2. How would you prevent recurrence?
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Prevent recurrence: dietary counseling to avoid high-potassium foods (bananas, oranges, potatoes). Review medications: lisinopril can cause hyperkalemia; consider discontinuing or reducing dose. Carvedilol can also contribute. Ensure adequate dialysis (missed sessions). Consider potassium binders like patiromer or sodium zirconium cyclosilicate if needed, but in dialysis patients, these are not typically used. Also, treat metabolic acidosis with sodium bicarbonate. Monitor K levels. So prevention: dietary restriction, medication review (stop lisinopril), and adherence to dialysis schedule.