Vitamin D Supplementation in Critically Ill-Narrative Review

Area of Science:

• Critical Care Medicine
• Nutritional Science
• Clinical Research

Background:

• Vitamin D deficiency is prevalent in critically ill patients, associated with increased risks of pneumonia, sepsis, and mortality.
• Existing research on vitamin D supplementation in this population shows varied results.
• This narrative review synthesizes evidence from randomized controlled trials (RCTs) on vitamin D supplementation in critically ill patients.

Purpose of the Study:

• To review and summarize the evidence from RCTs regarding the efficacy of vitamin D supplementation in critically ill patients.
• To identify trends and limitations in current research on vitamin D in critical care.

Main Methods:

• A comprehensive literature search was conducted in MEDLINE via PubMed for eligible RCTs.
• References from systematic reviews and meta-analyses were screened, and ongoing studies were searched on ClinicalTrials.gov.
• Inclusion criteria were broad, with no limits on vitamin D dosage, route of administration, or outcomes.

Main Results:

• Twenty-one RCTs involving 3166 patients were analyzed, revealing significant heterogeneity in patient characteristics and trial designs.
• Only a small subset of studies focused on patients with confirmed vitamin D levels below 50 nmol/L.
• Most studies found no significant differences in mortality, intensive care unit (ICU) length of stay (LoS), or hospital LoS between vitamin D intervention and control groups.

Conclusions:

• Significant variability exists in trial designs, including patient selection, vitamin D dosage, and administration protocols.
• Standardized protocols and measurement of baseline vitamin D levels are crucial for future clinical research.
• Improved study designs are necessary to accurately assess the impact of vitamin D supplementation in critically ill populations.