Cholesterol atheromatous embolism: an increasingly recognized cause of acute renal failure

Area of Science:

• Nephrology
• Cardiovascular Medicine
• Vascular Surgery

Background:

• Cholesterol atheromatous embolism is a systemic condition caused by cholesterol crystal emboli affecting multiple organs, notably the kidneys.
• Iatrogenic causes, including vascular procedures and anticoagulation, are significant inciting factors for this disease.

Purpose of the Study:

• To investigate the clinical presentation, diagnosis, and outcomes of acute renal failure secondary to cholesterol atheromatous embolism.
• To highlight the association between atherosclerosis, iatrogenic procedures, and the development of cholesterol embolism.

Main Methods:

• Retrospective analysis of fifteen patients with extensive atherosclerosis presenting with acute renal failure and peripheral ischemia.
• Diagnosis was based on clinical presentation, laboratory findings (e.g., eosinophilia), tissue examination, or retinal emboli.

Main Results:

• The study included 12 men and 3 women, average age 65. Fourteen patients had an identified inciting factor, primarily aortography (10) and aortic surgery (2).
• All patients exhibited skin lesions like digital mottling and livedo reticularis. Renal failure management varied, with 4 requiring dialysis and 11 managed conservatively.
• Seven patients died within 36 months, predominantly from cardiac causes. Eosinophilia was a common laboratory finding.

Conclusions:

• Cholesterol embolism is an increasingly recognized cause of acute renal failure, particularly in patients with atherosclerosis undergoing vascular interventions.
• Given its iatrogenic origins and growing at-risk population, the frequency of detecting cholesterol embolism as a cause of acute renal failure is anticipated to increase.