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Persistent Symptoms Despite Adequate KtV — ESENeph MCQ

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ModerateHaemodialysisPersistent Symptoms Despite Adequate KtVESENeph

A 50-year-old man with CKD G5D on HD has a Kt/V of 1.4 (above minimum target). However, he feels poorly with persistent nausea, fatigue, and poor concentration. His small solute clearance is adequate but he has been on standard 4-hour thrice-weekly HD for 10 years. What should be considered?

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Correct answer: C — Persistent uraemic symptoms despite adequate Kt/V may reflect inadequate middle molecule clearance or inadequate time on dialysis; consider extended hours, more frequent HD, or switch to HDF to improve middle molecule removal and clinical outcomes

Kt/V measures small solute (urea) clearance but does not capture middle molecule removal, which contributes significantly to uraemic symptoms. Patients with adequate Kt/V may still feel poorly due to accumulated middle molecules (beta-2 microglobulin, FGF23, p-cresyl sulphate, indoxyl sulphate). Solutions include: (1) extended hours (nocturnal HD 6-8 hr provides better middle molecule clearance); (2) more frequent HD (FHN trial showed benefit); (3) HDF (CONVINCE trial showed mortality benefit with high-volume convection). These approaches improve symptoms, cardiovascular outcomes, and potentially survival beyond what standard 4-hour thrice-weekly HD achieves.

Reference: CONVINCE Trial – NEJM 2023; FHN Trial – NEJM 2010; KDOQI 2015