Computed Tomography Technologist Practice Exam

Hydrating the patient before and after contrast administration is a well-established method to help reduce the incidence of Contrast-Induced Nephropathy (CIN), particularly in high-risk patients such as those with pre-existing renal impairment. When hydration is implemented, it helps to dilute the contrast agent in the renal tubules, decreasing its nephrotoxicity and improving the renal perfusion, which aids in the excretion of the contrast medium. Adequate hydration can also help maintain renal blood flow, which is crucial for ensuring optimal kidney function during and after the imaging procedure.

The other methods listed do not contribute positively to reducing CIN. Using high osmolar contrast media increases the risk of nephrotoxicity due to its higher viscosity and osmotic effects on the renal tubules. Administering the largest dose possible of contrast is counterproductive, as a higher volume can lead to greater renal exposure to potentially harmful substances. Conducting the scan without prior preparation undermines patient safety by neglecting to account for potential risk factors, which could increase the likelihood of CIN. Thus, the emphasis on pre- and post-procedure hydration stands out as a preventative measure for safeguarding against contrast-related kidney injury.