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Comparing ethanol lock therapy versus vancomycin lock in a salvation strategy for totally implantable vascular access device infections due to coagulase-negative staphylococci (the ETHALOCK study): a prospective double-blind randomized clinical trial

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Abstract

Objectives

Little is known about efficacy and safety of ethanol lock therapy (ELT) to treat totally implantable venous access device (TIVAD) infections. The objective of this trial was to evaluate the effectiveness and safety profile of a local treatment with ELT without removal for TIVAD infection due to coagulase-negative staphylococci.

Methods

We performed a prospective, multicenter, double-blind, randomized clinical trial comparing the efficacy of 40% ELT versus vancomycin lock therapy (VLT) in TIVAD infections due to coagulase-negative staphylococci, complicated or not by bloodstream infection.

Results

Thirty-one patients were assigned to the ELT group and 30 to the VLT arm. Concomitant bacteremia was present in 41 patients (67.2%). Treatment success was 58.1 % (18 of 31) for the ELT arm and 46.7% (14 of 30) for the VLT arm (p = 0.37). The overall treatment success was 52.5% (32). The risk of treatment failure due to uncontrolled infections, superinfections, and mechanical complications did not differ significantly between participants receiving ELT (13 out of 31 [42%]) and those receiving VLT (16 out of 30 [53%]) with a hazard ratio of 0.70 (p = 0.343; 95% CI [0.34–1.46], Cox model). Catheter malfunctions were significantly more frequent in the ELT arm (11 patients versus 2 in the VLT group, p = 0.01).

Conclusions

We found an overall high rate of treatment failure that did not differ between the ELT arm and the VLT arm. TIVAD removal must be prioritized to prevent complications (uncontrolled infections, superinfections, and catheter malfunctions) except in exceptional situations.

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Data availability

The datasets generated during and/or analyzed during the current study are not publicly available due to risk of individual privacy compromission but are available from the corresponding author on reasonable request

Abbreviations

TIVADs:

totally implantable venous access devices

ELT:

ethanol lock therapy

VLT:

vancomycin lock therapy

CRBSI:

catheter-related bloodstream infection

CoNS:

coagulase-negative staphylococci

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Acknowledgements

We thank our microbiologist colleagues Julien Delmas and Frédéric Robin for their technical assistance. We thank Dr. Natacha Mrozek, Dr. Magali Vidal, Dr. Clément Théis, and Delphine Martineau for their participation.

Funding

The research protocol was accepted for funding by an Inter-Regional Hospital Clinical Research Program (PHRC-IR Auvergne-Rhône-Alpes).

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Authors

Contributions

O.L. contributed to the study conception and design. Data collection was performed by all the other authors. The first draft of the manuscript was written by O.L. and L.S., and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Olivier Lesens.

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The study was approved by the CPP Sud-Est VI ethics committee n°AU 1120, the CNIL (French Data Protection Authority) n°1223379, and the ANSM (National Drug Agency) and registered under the ClinicalTrials.gov Identifier number NCT02411331.

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The authors declare no competing interests.

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Lesens, O., Forestier, E., Botelho-Nevers, E. et al. Comparing ethanol lock therapy versus vancomycin lock in a salvation strategy for totally implantable vascular access device infections due to coagulase-negative staphylococci (the ETHALOCK study): a prospective double-blind randomized clinical trial. Eur J Clin Microbiol Infect Dis 43, 223–232 (2024). https://doi.org/10.1007/s10096-023-04702-w

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