IV iodinated contrast used for CT scan can cause which complication?

• A. Kidney injury
• B. Hypertension
• C. Hyperkalemia
• D. Hypoglycemia

Answer: (A)

IV iodinated contrast can cause contrast-induced nephropathy, a form of acute kidney injury. The contrast agent can reduce renal blood flow and exert direct tubular toxicity, leading to a rise in creatinine 24 to 72 hours after exposure. This risk is higher if there is preexisting kidney disease, diabetes, dehydration, older age, heart failure, or concurrent nephrotoxic medications. Preventive steps include ensuring good hydration, using the smallest effective dose, and choosing lower- or iso-osmolar contrast when possible.

Hypertension, hyperkalemia, and hypoglycemia are not typical direct complications of iodinated contrast. The main concern and the reason kidney injury is the correct answer is the potential for acute nephropathy after contrast administration.