Renovascular imaging in the NSF Era

Area of Science:

• Radiology
• Nephrology
• Medical Imaging

Background:

• Nephrogenic systemic fibrosis (NSF) is a rare, severe condition linked to gadolinium chelate (Gd-chelate) administration in patients with renal impairment.
• Contrast-enhanced MR-angiography (MRA) has been the standard for diagnosing renal disease, but NSF concerns limit Gd-chelate use in chronic renal failure patients.
• This necessitates exploring safer alternatives for renal artery imaging.

Purpose of the Study:

• To review the appropriate use of renal MRA in patients with kidney disease.
• To focus on newly developed nonenhanced MRA techniques as a safer alternative to contrast-enhanced MRA.
• To critically evaluate functional renal imaging techniques and their clinical utility.

Main Methods:

• Review of existing literature on renal MRA techniques.
• Focus on nonenhanced MRA methods, particularly those using steady-state free precession (SSFP) with electrocardiogram (ECG) gating.
• Appraisal of functional renal imaging techniques.

Main Results:

• Nonenhanced MRA techniques, primarily SSFP with ECG-gating, provide acceptable spatial resolution for visualizing proximal renal arteries.
• These techniques offer a viable alternative to contrast-enhanced MRA, mitigating NSF risks.
• Functional renal imaging plays a role in assessing renal function.

Conclusions:

• Nonenhanced MRA represents a promising advancement for renal artery imaging in patients with impaired renal function, reducing NSF risks.
• Further evaluation of these techniques and functional imaging is warranted for optimal clinical application.
• Balancing diagnostic efficacy with patient safety is crucial in selecting MRA modalities.