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Occult Potassium Sources Dialysis — ESENeph MCQ

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EasyElectrolyte DisordersOccult Potassium Sources DialysisESENeph

A 50-year-old man on haemodialysis is found to have a high pre-dialysis serum potassium of 6.8 mmol/L despite dietary adherence. His interdialytic weight gain is only 1.5 kg. His dialysis adequacy (spKt/V) is 1.3. Dialysate potassium is 2 mmol/L. What other sources of potassium load should be investigated?

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Correct answer: D — Medications: check for potassium-containing drugs (oral supplements prescribed elsewhere, salt substitutes containing KCl, herbal remedies, co-prescribed medications with potassium content)

Occult potassium sources are frequently overlooked in dialysis patients. Common culprits include: co-prescribed potassium supplements (sometimes prescribed by other specialists unaware of dialysis), salt substitutes containing KCl (Lo-Salt), herbal remedies, over-the-counter medications with potassium content, parenteral nutrition, and medications with high potassium content (e.g. IV penicillin). A thorough medication reconciliation is essential. Additionally, constipation reduces colonic potassium excretion and should be addressed.

Reference: ERA-EDTA 2019 – Potassium in HD; KDOQI 2020 – Nutrition