Plasma citrulline concentration and plasma LPS detection among critically ill patients a prospective observational study

Purpose: Gut can be a source of sepsis but sepsis itself can induce gut dysfunction. We aimed to study whether plasma citrulline, a marker of enterocyte mass, was correlated with plasma lipopolysaccharide, a potential marker of bacterial translocation among critically ill patients. Materials and methods: Critically ill patients admitted to the ICU. Plasma citrulline and plasma LPS concentration and activity were measured at ICU admission. Patients were compared according to the presence of sepsis at ICU admission. Results: 109 critically ill patients, with SOFA score 8 [6-12], were prospectively included. Sixty six patients (61%) had sepsis at ICU admission. There was no correlation between plasma citrulline concentration and plasma LPS concentration or activity. However, sepsis at ICU admission was associated with a lower plasma citrulline concentration (13.4 mu mol.L- 1 vs 21.3 mu mol.L- 1, p = 0.02). Plasma LPS activity was significantly higher among patients with abdominal sepsis compared to patients with extra-abdominal sepsis (1.04 EU/mL vs 0.63, p = 0.01). Conclusions: Plasma citrulline is not associated with the level of plasma LPS but is strongly decreased among septic patients. Detection of LPS is ubiquitous among critically ill patients but abdominal sepsis is associated with increased plasma LPS activity compared to extra-abdominal sepsis.

Automated summary

The aim of this study was to investigate the correlation between plasma citrulline levels and plasma lipopolysaccharide (LPS) concentration, as well as the impact of sepsis on gut function in critically ill patients. The results showed no correlation between plasma citrulline concentration and plasma LPS concentration or activity. However, septic patients had significantly lower plasma citrulline levels. Additionally, abdominal sepsis was associated with higher plasma LPS activity compared to extra-abdominal sepsis.