Vitamin D deficiency strongly linked to increased sepsis risk and mortality in umbrella review
Background
Sepsis remains a leading cause of morbidity and mortality globally, particularly in vulnerable populations, despite advances in treatment. Identifying modifiable factors influencing susceptibility and outcomes is critical. Vitamin D, beyond its role in calcium homeostasis, is a key regulator of both innate and adaptive immune responses, modulating antimicrobial peptides like cathelicidin and defensins, regulating cytokine production, and supporting endothelial stability. These mechanisms are directly relevant to the dysregulated inflammation, immune dysfunction, and endothelial injury characteristic of sepsis.
Study Design
This study conducted a PRISMA-compliant umbrella review and meta-analysis to synthesize existing evidence on the association between vitamin D status and sepsis outcomes. Researchers systematically reviewed and analyzed prior meta-analyses and systematic reviews, focusing on studies that investigated serum 25-hydroxyvitamin D concentrations in relation to sepsis incidence, severity, and mortality. The methodology involved comprehensive literature searches and rigorous data extraction to consolidate findings across multiple prior syntheses, ensuring a robust overview of the cumulative evidence.
Results
The umbrella review consistently found a high prevalence of vitamin D deficiency among critically ill patients, especially those with sepsis. Multiple meta-analyses demonstrated a significant association between low serum 25-hydroxyvitamin D concentrations and adverse sepsis outcomes. Specifically, vitamin D deficiency was linked to an increased risk of developing sepsis, as well as higher in-hospital and intensive care unit (ICU) mortality. The association between vitamin D status and sepsis appeared to be even more pronounced in pediatric and neonatal populations, suggesting a heightened vulnerability in these groups. The consistent findings across numerous prior systematic reviews and meta-analyses underscore the robust nature of this association. This comprehensive synthesis reinforces the critical role of vitamin D in immune function and its implications for sepsis prognosis.
Vitamin D deficiency was consistently associated with increased sepsis risk, severity, and mortality across multiple prior meta-analyses.
Key Findings
- High prevalence of vitamin D deficiency observed in critically ill patients with sepsis.
- Low serum 25-hydroxyvitamin D concentrations consistently linked to increased sepsis risk.
- Vitamin D deficiency associated with higher in-hospital mortality in sepsis patients.
- Increased intensive care unit (ICU) mortality consistently found in sepsis patients with vitamin D deficiency.
- Association between vitamin D status and sepsis outcomes is more pronounced in pediatric and neonatal populations.
Why It Matters
This umbrella review reinforces the critical importance of vitamin D status in sepsis outcomes, suggesting that maintaining adequate levels could be a modifiable factor to improve prognosis. For clinicians, it highlights the potential benefit of screening for and correcting vitamin D deficiency in critically ill patients, particularly those at risk for or diagnosed with sepsis. While this review doesn't provide a specific protocol, it strengthens the rationale for considering vitamin D supplementation as an adjunctive strategy, especially in vulnerable populations like neonates and children. Future research, particularly randomized controlled trials, is needed to establish optimal dosing and timing for supplementation to translate these associations into concrete clinical protocols for sepsis prevention or treatment.
vitamin d
sepsis
mortality
immune function
critical care
meta-analysis