Causes of Burr Cells (Echinocytes) in Red Blood Cells

Pathophysiological Mechanisms

Alterations in red blood cell membrane composition, particularly due to liver disease, uremia, and metabolic disturbances, can cause burr cell formation, as noted by the MMWR Recommendations and Reports 1
Uremic toxins in chronic kidney disease can trigger eryptosis, leading to burr cell formation, according to Cell Death and Disease 2
Oxidative stress can damage red blood cell membranes, resulting in phospholipid membrane asymmetry and burr cell formation, as reported by Cell Death and Disease 3
Hyperbilirubinemia can trigger eryptosis, altering membrane structure and leading to burr cell formation, as described by Cell Death and Disease 4, 5

Hepatic failure and hyperbilirubinemia can increase the percentage of eryptotic erythrocytes, which often appear as burr cells, according to Cell Death and Disease 7
Bile acids and bilirubin can have direct eryptotic effects on red blood cells, altering their membrane structure, as reported by Cell Death and Disease 4

Chronic kidney disease and end-stage renal disease are associated with increased eryptosis and burr cell formation, as noted by Cell Death and Disease 8
Uremic toxins can directly stimulate eryptosis, raising cytosolic calcium concentration and enhancing ceramide levels, according to Cell Death and Disease 3
Parathyroid hormone levels in CKD correlate with the degree of eryptosis and burr cell formation, as reported by Cell Death and Disease 8

Neurological disorders like Parkinson's and Alzheimer's diseases can trigger eryptosis through altered calcium regulation and ceramide formation, as described by Cell Death and Disease 7
Oxidative stress in various conditions, including hypertension, can lead to lipid peroxidation in erythrocytes and burr cell formation, according to Cell Death and Disease 7

The presence of burr cells on peripheral blood smear is a diagnostic indicator of microangiopathic hemolytic anemia in conditions like hemolytic uremic syndrome, as noted by MMWR Recommendations and Reports 1

Recognition of burr cells should prompt investigation of liver and kidney function, as recommended by Cell Death and Disease 4, 8
Addressing underlying causes of oxidative stress may help reduce burr cell formation and associated hemolysis, according to Cell Death and Disease 2
Patients with burr cells due to uremia may require optimization of dialysis to reduce uremic toxins, as reported by Cell Death and Disease 3