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Phosphate Cardiovascular Mortality CKD — ESENeph MCQ

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EasyChronic Kidney DiseasePhosphate Cardiovascular Mortality CKDESENeph

A 55-year-old man with CKD G5D on haemodialysis takes regular phosphate binders. He asks why controlling phosphate is so important. What is the primary long-term consequence of uncontrolled hyperphosphataemia in CKD?

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Correct answer: C — Vascular calcification leading to increased cardiovascular mortality – phosphate is an independent risk factor for cardiovascular death in CKD

Hyperphosphataemia is independently associated with cardiovascular mortality in CKD, primarily through promotion of vascular (medial) calcification. Elevated phosphate drives osteogenic transformation of vascular smooth muscle cells, depositing hydroxyapatite in vessel walls. This leads to arterial stiffness, coronary calcification, valvular calcification, and increased cardiovascular events. KDIGO 2017 CKD-MBD emphasises maintaining phosphate toward normal range. The calcium-phosphate product, FGF23 levels, and PTH all interact in this pathophysiology.

Reference: KDIGO 2017 – CKD-MBD; Block et al 2004 – Phosphate and Mortality