The pathogenesis of abnormal erythrocyte morphology in burns

Area of Science:

• Biochemistry
• Hematology
• Burn Medicine

Background:

• Anemia in thermal injury involves decreased red blood cell (RBC) half-life and abnormal RBC morphology.
• These RBC changes are reversible, suggesting an extrinsic plasma-mediated mechanism rather than direct thermal or mechanical damage.

Purpose of the Study:

• To investigate the role of plasma and erythrocyte membrane lipid composition in the anemia of thermal injury.
• To correlate lipid alterations with observed RBC morphology in burn patients.

Main Methods:

• Analysis of plasma and erythrocyte membrane lipid composition in 30 burn patients (mean 60% TBSA).
• Assessment of RBC morphology in vivo and in vitro.
• Determination of total cholesterol, phospholipids, essential fatty acids, and free fatty acid/albumin ratios.

Main Results:

• Plasma and lipoprotein cholesterol and phospholipids were decreased, while RBC membrane lipids remained normal.
• Plasma phospholipids showed increased phosphatidylcholine and decreased lysophosphatidylcholine and sphingomyelin.
• Essential fatty acid levels decreased in plasma and red blood cells.
• A significantly increased ratio of free fatty acids to albumin was observed in patient plasma.

Conclusions:

• Burn-induced anemia is associated with significant alterations in plasma lipid profiles, not intrinsic red blood cell membrane defects.
• The increased plasma free fatty acid to albumin ratio is implicated as a potential primary factor in the abnormal RBC morphology and reduced survival seen in thermal injury.
• These findings highlight the critical role of plasma lipid dysregulation in the pathophysiology of burn-related anemia.