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Open Access 01-12-2024 | Septicemia | Research

Differential effects of thiamine and ascorbic acid in clusters of septic patients identified by latent variable analysis

Authors: David Legouis, Céline Monard, Aimad Ourahmoune, Sebastian Sgardello, Hervé Quintard, Gilles Criton, Frederic Sangla, Antoine Schneider

Published in: Critical Care | Issue 1/2024

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Abstract

Background

Thiamine and ascorbic acid have been proposed to mitigate the devastating consequences of sepsis and septic shock. To date, randomized controlled trials have failed to demonstrate a benefit of these therapies and heterogeneity of treatment effect is suspected. In this study, we aimed at assessing the heterogeneity of treatment effect of thiamine (B1) and the combination of B1 plus ascorbic acid (AA + B1) in critically ill patients with sepsis.

Methods

We conducted a bi-centric retrospective cohort study. All adult patients admitted to the ICU with sepsis or septic shock between January 2012 and August 2022 were included. Patient clusters were identified using latent variable analysis based on demographics and physiological variables obtained within 24 h of admission. Within each cluster and using inverse probability weighted Cox models, we compared in-hospital mortality between patients who received standard treatment (control), standard treatment plus B1 (B1 group), and standard treatment plus a combination of thiamine and ascorbic acid (AA + B1 group).

Results

A total of 3465 septic patients were included, 2183, 1054 and 228 in the standard, B1 and AA + B1 groups respectively. Five clusters of patients were identified in an unsupervised manner. The “Cluster Severe” included the most severely ill patients, the “Cluster Resp” patients presented with predominantly respiratory failure, the “Cluster Old” included elderly patients with multiple comorbidities, the “Cluster Fit” patients were young, healthy with low severity indices and “Cluster Liver” included patients with predominant liver failure. B1 treatment was associated with different outcomes across the five clusters. It was associated with a lower in-hospital mortality in the “Cluster Severe” and “Cluster Resp”. On the other hand, the combination of thiamine and ascorbic acid was not associated with reduced mortality in any cluster but an increased mortality in”Cluster Old”.

Conclusions

These results reinforce the lack of efficacy of the combination of AA + B1 reported in recent trials and even raise concerns about potential harm in older patients with comorbidities. On the contrary, we reported improved ICU survival associated with B1 supplementation in the most severe patients and those with predominant respiratory failure, supporting the need for further trials in this specific population.
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Metadata
Title
Differential effects of thiamine and ascorbic acid in clusters of septic patients identified by latent variable analysis
Authors
David Legouis
Céline Monard
Aimad Ourahmoune
Sebastian Sgardello
Hervé Quintard
Gilles Criton
Frederic Sangla
Antoine Schneider
Publication date
01-12-2024
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2024
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/s13054-024-05188-4

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