Plasma lipid peroxides and alpha-tocopherol in critically ill patients

Area of Science:

• Biochemistry
• Critical Care Medicine
• Pathophysiology

Background:

• Critically ill patients often experience oxidative stress.
• Lipid peroxidation is a marker of oxidative damage.
• Alpha-tocopherol (vitamin E) is a key antioxidant.

Purpose of the Study:

• To compare plasma lipid peroxide (TBARS) and alpha-tocopherol levels in critically ill patients versus controls.
• To investigate the relationship between lipid peroxidation and disseminated intravascular coagulation (DIC) in intensive care unit (ICU) patients.

Main Methods:

• Measurement of plasma thiobarbituric acid reactive substances (TBARS) as a marker of lipid peroxidation.
• Quantification of plasma alpha-tocopherol levels.
• Comparison between 24 critically ill patients and control subjects.
• Monitoring TBARS levels in ICU patients before and during DIC development.

Main Results:

• Critically ill patients had significantly lower plasma alpha-tocopherol levels compared to controls.
• Critically ill patients showed significantly higher plasma TBARS levels than controls.
• ICU patients who developed DIC had significantly elevated TBARS levels during the event compared to pre-DIC levels.

Conclusions:

• Critically ill patients experience increased lipid peroxidation and reduced antioxidant capacity.
• Elevated lipid peroxidation, indicated by TBARS, may play a role in the pathogenesis of DIC in critically ill patients.