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Contrast-induced AKI — the kidney injury after iodinated contrast scans. Who's at risk, how to prevent it (hydration, metformin rules), and the modern evidence.
Evidence reviewed & updated: 2026-08 — reflects the latest published trials and guidelines.
Contrast-induced acute kidney injury (CI-AKI) is a rise in creatinine within 48 hours of iodinated contrast — most relevant for people with existing CKD and diabetes. The modern view is nuanced: IV contrast risk is lower than once believed, but prevention matters: identify risk, hydrate appropriately, and follow metformin rules.
The main risk factor is pre-existing chronic kidney disease — the risk climbs as eGFR falls, especially below 30. Diabetes adds risk mainly through coexisting CKD and dehydration. Other contributors: dehydration, age, heart failure, and concurrent nephrotoxins (NSAIDs, ACEi/ARB are generally continued, but NSAIDs should pause).
For people with eGFR ≥45 and no risk factors, IV contrast carries very low AKI risk — the benefit of a diagnostic scan almost always outweighs it.
Registry studies (e.g., large matched analyses of contrast vs non-contrast CT) found the AKI risk from modern IV contrast is lower than the historical estimates — and that routine creatinine checks before every scan in low-risk patients are often unnecessary. The old 'baseline creatinine required for all' era has softened.
That doesn't mean no risk: in advanced CKD, prevention protocols still apply. The safest summary: know your eGFR, hydrate, and coordinate with the imaging team if you have stage 3b+ CKD or diabetes.
Hydration is the only proven preventive: for inpatients, IV fluids (e.g., normal saline or bicarbonate-based protocols) before and after; for outpatients, oral fluids per protocol. Stopping NSAIDs around the scan, and following the metformin label: hold on the day of contrast and 48 hours after, restart after confirming kidney function is stable.
NAC (N-acetylcysteine) and other old 'preventive' agents are no longer recommended — hydration is the evidence-based intervention. In dialysis patients, contrast is safe and no special dialysis timing is required.
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