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Updated: May 3, 2026
Endotoxin Activity Assay for the Detection of Whole Blood Endotoxemia in Critically Ill Patients
Published on: June 24, 2019
Effect of empiric antibiotic treatment on plasma endotoxin activity in septic patients
F Mignon1, M Piagnerelli, M Van Nuffelen
1Department of Intensive Care, Erasme University Hospital, Université Libre de Bruxelles, 1070, Brussels, Belgium, fmignon@ulb.ac.be.
Objectives:
Efficient empiric antibiotic therapy remains the cornerstone of sepsis treatment. However, antibiotics could be responsible for the transient clinical deterioration provoked by the release of bacterial cell-wall constituents, such as endotoxin, into the blood stream. The aim of this study was to evaluate if a transient elevation of endotoxin level occurred in septic patients following antibiotic administration.
Methods:
Thirty-three septic intensive care unit (ICU) patients were enrolled in this prospective trial. Four blood samples were collected from each of these patients during a 24-h period, and endotoxin activity was measured in these samples by the chemiluminescence technique. Fifteen ICU non-septic patients and 15 healthy volunteers were also observed for possible daily fluctuations in endotoxin activity.
Results:
There was no significant increase in endotoxin levels following the initiation of empiric antibiotic therapy in septic patients. A clinical deterioration in the 4 h following antibiotic administration was observed in 14 septic patients (42 %). These patients had significantly higher endotoxin levels than stable septic patients.
Conclusions:
Although endotoxin levels failed to increase after the administration of antibiotic(s) to critically ill patients, they were higher in the septic patients presenting a transient deterioration than in the other patients. This observation suggests that a possible release of endotoxin due to bacteria lysis by antibiotics could be responsible for the observed clinical deterioration.
Insights
Antibiotics are crucial for sepsis, but may cause temporary worsening. This study found no endotoxin increase after antibiotics, but higher levels in deteriorating septic patients suggest endotoxin release contributes to clinical decline.
Area of Science:
- Critical Care Medicine
- Infectious Diseases
- Pharmacology
Background:
- Empiric antibiotic therapy is vital for sepsis management.
- Antibiotics may paradoxically worsen sepsis via bacterial cell-wall component release.
- Endotoxin release is a potential mechanism for transient clinical deterioration.
Purpose of the Study:
- To investigate if endotoxin levels transiently increase post-antibiotic administration in septic patients.
- To correlate endotoxin levels with clinical deterioration following antibiotic treatment.
Main Methods:
- Prospective trial involving 33 intensive care unit (ICU) septic patients.
- Endotoxin activity measured via chemiluminescence in blood samples over 24 hours.
- Comparison with 15 non-septic ICU patients and 15 healthy volunteers.
Main Results:
- No significant endotoxin level increase was observed after initiating empiric antibiotic therapy.
- 42% of septic patients experienced transient clinical deterioration within 4 hours of antibiotic administration.
- Deteriorating septic patients exhibited significantly higher endotoxin levels than stable patients.
Conclusions:
- Antibiotic administration did not elevate endotoxin levels in critically ill septic patients.
- Higher endotoxin levels in deteriorating patients suggest a role in post-antibiotic clinical decline.
- Bacterial lysis by antibiotics may release endotoxin, contributing to transient sepsis worsening.
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