Update on clinical micronutrient supplementation studies in the critically ill

Area of Science:

• Critical care medicine
• Nutritional science
• Biochemistry

Background:

• Micronutrient deficiencies are common in critically ill patients due to losses, low intake, and redistribution.
• Selenium is an emerging micronutrient of significant interest in critical illness management.
• Previous studies suggest potential benefits of micronutrient supplementation in critical illness.

Purpose of the Study:

• To review the evidence for micronutrient supplementation, particularly selenium, in critically ill patients.
• To analyze the mechanisms, methods, and limitations of current research.
• To provide perspective on the role of selenium in critical care.

Main Methods:

• Review of recent studies, meta-analyses, and reviews on micronutrient supplementation in critical illness.
• Analysis of evidence regarding selenium's effects on mortality, complications, and healing.
• Evaluation of safety and efficacy based on dose duration and route of administration.

Main Results:

• Growing evidence supports antioxidant supplements, especially high-dose selenium, in reducing mortality and infectious complications.
• Selenium supplementation may also improve wound healing in critically ill patients.
• Short-term high-dose selenium appears safe, while prolonged high doses may have deleterious effects.

Conclusions:

• Micronutrient supplements, particularly selenium, show promise for conditions like burns, trauma, sepsis, and stroke.
• Intravenous administration seems more effective than enteral for micronutrient delivery.
• Further research is essential to determine optimal micronutrient combinations, doses, and timing for specific patient populations and disease severities.