Thoracic duct in patients with multiple organ failure: no major route of bacterial translocation
L C Lemaire1, J B van Lanschot, C P Stoutenbeek
1Department of Surgery, Academic Medical Center, Amsterdam, The Netherlands.
Objective:
To determine whether translocation of bacteria or endotoxin occurred into the thoracic duct in patients with multiple organ failure (MOF).
Summary Background Data:
Translocation of bacteria or endotoxin has been proposed as a causative factor for MOF in patients without an infectious focus, although it has rarely been demonstrated in patients at risk for MOF. Most studies have investigated the hematogenic route of translocation, but it has been argued that lymphatic translocation of bacteria or endotoxin by the thoracic duct is the major route of translocation.
Methods:
The thoracic duct was drained for 5 days in patients with MOF caused either by generalized fecal peritonitis (n = 4) or by an event without clinical and microbiologic evidence of infection (n = 4). Patients without MOF who were undergoing a transthoracic esophageal resection served as controls. In lymph and blood, concentrations of endotoxin, proinflammatory cytokines, and antiinflammatory cytokines were measured.
Results:
Endotoxin concentrations in lymph and blood of patients with MOF ranged from 39 to 63 units per liter and were not significantly different from concentrations in patients without MOF. The quantity of endotoxin transported by the thoracic duct in the study group was small. In patients with MOF, low levels of proinflammatory cytokines and high levels of antagonists of these cytokines were found.
Conclusion:
This study provides evidence that translocation (especially of endotoxin) occurs into the thoracic duct. However, these data do not support the concept that the thoracic duct is a major route of bacterial translocation in patients with MOF.
Insights
Bacterial translocation into the thoracic duct occurs in multiple organ failure (MOF), but it is not the primary route. Endotoxin translocation was observed, but in small quantities, suggesting other pathways are more significant in MOF development.
Area of Science:
- Gastroenterology
- Critical Care Medicine
- Immunology
Background:
- Bacterial and endotoxin translocation are hypothesized causes of multiple organ failure (MOF).
- Lymphatic translocation via the thoracic duct is proposed as a major route, yet rarely demonstrated.
- Previous research primarily focused on the hematogenic translocation pathway.
Purpose of the Study:
- To investigate bacterial and endotoxin translocation into the thoracic duct in patients with MOF.
- To assess the role of the thoracic duct as a route for translocation in MOF.
- To measure endotoxin and cytokine levels in thoracic duct lymph and blood.
Main Methods:
- Thoracic duct drainage for 5 days in MOF patients (n=8) and controls (n=transthoracic esophageal resection).
- Measurement of endotoxin, proinflammatory cytokines, and anti-inflammatory cytokines in lymph and blood.
- Comparison of translocation markers between MOF patients and controls.
Main Results:
- Endotoxin levels in lymph and blood were similar between MOF patients and controls.
- The quantity of endotoxin translocated via the thoracic duct was minimal.
- MOF patients exhibited low proinflammatory cytokine and high anti-inflammatory cytokine antagonist levels.
Conclusions:
- Evidence suggests endotoxin translocation into the thoracic duct occurs in MOF.
- The thoracic duct is unlikely to be a major route for bacterial translocation in MOF.
- Findings indicate a complex interplay of inflammatory and anti-inflammatory responses in MOF.
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