Evaluation of Radiographic Contrast-Induced Nephropathy by Functional Diffusion Weighted Imaging.

Area of Science:

• Nephrology
• Radiology
• Medical Imaging

Background:

• Contrast-induced nephropathy (CIN) is a significant complication following radiographic contrast medium (XCM) administration.
• CIN is characterized by elevated creatinine levels 48-72 hours post-XCM exposure.
• Early detection of CIN is crucial for managing high-risk patients.

Purpose of the Study:

• To evaluate microstructural renal changes associated with CIN using diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI).
• To assess the utility of DWI/DTI in identifying CIN in patients undergoing cardiological interventions.

Main Methods:

• Fifteen high-risk patients (5 CIN, 10 non-CIN) underwent pre- and post-intervention 3T MRI scans.
• Renal DWI was performed using a paracoronal echo-planar-imaging sequence.
• Serum creatinine and urinary injury markers were monitored alongside imaging.

Main Results:

• The CIN group showed a decrease in cortical and medullary apparent diffusion coefficient (ADC) and fractional anisotropy (FA) post-XCM.
• The non-CIN group exhibited only a change in medullary ADC.
• These diffusion changes were detectable before alterations in serum kidney function parameters.

Conclusions:

• DWI/DTI may serve as a valuable tool for monitoring high-risk CIN patients within a multi-modality clinical protocol.
• Further research involving advanced diffusion signal analysis could enhance the identification of patients susceptible to CIN.