Zinc Deficiency in Critically Ill Patients: Impact on Clinical Outcome

Area of Science:

• Critical Care Medicine
• Nutritional Science
• Trace Element Metabolism

Background:

• Zinc is an essential trace element crucial for numerous enzymatic functions and organ system health.
• Limited research exists on the prevalence and clinical impact of zinc deficiency in critically ill patient populations.
• Understanding zinc status is vital for optimizing patient care in intensive care units (ICUs).

Purpose of the Study:

• To prospectively assess the prevalence of zinc deficiency in critically ill adult patients.
• To investigate the association between zinc deficiency and clinical outcomes, including ICU mortality and length of stay.
• To explore the relationship between zinc levels and illness severity scores (APACHE II, SOFA).

Main Methods:

• Prospective observational study of 50 critically ill adult patients in a tertiary care ICU.
• Patients categorized by serum zinc levels: normal (≥ 71 µg/dl) and deficient (≤ 70 µg/dl).
• Deficiency further classified as mild, moderate, or severe; outcomes included ICU mortality, ventilation duration, AKI, RRT, and vasopressor use.

Main Results:

• Zinc deficiency was highly prevalent, found in 86% (43/50) of patients.
• No significant difference in ICU mortality between zinc-deficient (33%) and normal zinc-level patients (43%).
• Zinc-deficient patients were older (mean age 69 vs. 49 years) and showed a trend towards increased need for renal replacement therapy (RRT).

Conclusions:

• Zinc deficiency is extremely common in critically ill patients.
• The study suggests zinc deficiency in this cohort does not correlate with illness severity or predict poorer outcomes.
• Larger studies are needed to confirm these findings and establish definitive conclusions regarding zinc's role in critical illness.