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Metabolic Profiling Among Patients Suspected of Infective Endocarditis - PPSIE Comparing Metabolomes of Bloodstream Infections Versus Infective Endocarditis (PPSIE)

3 november 2026 bijgewerkt door: University Hospital, Angers

Most cases of Infective endocarditis (IE) are caused by Gram-positive bacteria, primarily Staphylococcus aureus, oral or intestinal streptococci, and enterococci (especially Enterococcus faecalis). Blood cultures for these bacteria may indicate simple bacteremia (without cardiac involvement) or endocarditis. The proportion of patients with IE among those presenting with positive blood cultures varies depending on the pathogen (approximately 10% for S. aureus, 5 to 50% for oral streptococci, depending on the species, and 15% for E. faecalis).

The PPSIE study aims to identify a specific biological signature of infective endocarditis that would allow identification of valvular involvement in patients with positive blood cultures.

Patients will be selected based on a blood culture positive for one of the following organisms: S. aureus, S. mutans, S. gordonii, S. sanguinis, S. parasanguinis, S. gallolyticus, S. mitis/oralis, E. faecalis, as well as based on the likelihood of endocarditis determined by a clinical score specific to the causative pathogen (VIRSTA, HANDOC, or DENOVA) A blood sample will be collected 1 day, 5 days, and 3 months after enrollment. Patients will be classified into the groups "bacteremia without cardiac involvement (BasAC)," "definite infectious endocarditis (confirmed IE)," or "possible infectious endocarditis" according to the Duke classification modified by the ISCVID in 2023; uncertain cases will be assessed by an adjudication committee. Untergeted metabolomic analysis will be performed on these blood samples in order to find a metabolic signature able to discriminate patients with endocarditis from those without cardiac involvement. The prediction model will be built using a total of 80 patients, comprising 40 "confirmed IE" patients and 40 "IE excluded" (BasAC) patients.

The model will then be validated using a randomly selected sample from the "possible IE" group, according to the Duke classification modified by the ISCVID in 2023.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Studietype

Ingrijpend

Inschrijving (Geschat)

240

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Contact Back-up

Studie Locaties

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

18 jaar en ouder (Volwassen, Oudere volwassene)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Allemaal

Beschrijving

Inclusion Criteria :

  • Adult patient
  • Blood culture positive for one of the following organisms: S. aureus, S. mutans, S. gordonii, S. sanguinis, S. parasanguinis, S. gallolyticus, S. mitis/oralis, E. faecalis
  • Patient enrolled in or covered by a social security program
  • Patient who has signed an informed consent form

Exclusion Criteria:

  • Expected time between the start of antibiotic treatment and the collection of the blood sample for the study (the morning after the consent form is signed) exceeding 5 days
  • Polymicrobial blood culture, defined as the presence of more than one microbial species in the same blood culture bottle or in several different bottles during the same infectious episode, with the exception of organisms whose presence indicates bottle contamination, such as coagulase-negative staphylococci, Bacillus sp., Cutibacterium sp., Micrococcus sp., Corynebacterium sp.
  • Low risk of endocarditis, estimated by a clinical score:
  • VIRSTA score < 3 for S. aureus bacteremias
  • HANDOC score < 3 for streptococcal bacteremias
  • DENOVA score < 3 for E. faecalis bacteremias
  • Patients whose medical condition raises concerns about death within 3 months
  • Pregnant, breastfeeding, or laboring women
  • Individuals deprived of liberty by judicial or administrative order
  • Individuals receiving involuntary psychiatric care
  • Individuals subject to a legal protective measure
  • Individuals unable to give informed consent
  • Poor understanding of the French language

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Diagnostisch
  • Toewijzing: NVT
  • Interventioneel model: Opdracht voor een enkele groep
  • Masker: Geen (open label)

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Patients included in the study
Procedure: Blood sample

Blood sample

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Metabolomic signature
Tijdsspanne: Day 1 and Day 5 after enrollement

The existence of a metabolic signature will be confirmed by the presence of a latent variable predictive of cardiac involvement in the study population. This variable will be selected after comparing the metabolic profiles between the 'confirmed EI' group and the Bacteremia Without Cardiac Involvement (BaSAC) group for each time point considered (Day 1 and Day 5). To avoid overfitting, the predictive ability of the multivariate model (orthogonal partial least squares in the context of discriminant analysis, or OPLS-DA) will be evaluated using "standard" criteria as implemented in the SIMCA software, with a low prediction error rate (Q2Ycum ≥ 0.5) and performance significantly superior to that of the random model (P-value (CV-ANOVA) ≤ 0.05, Q2Ycum from the permutation test < 0).
Day 1 and Day 5 after enrollement

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Identify potential biomarkers (BM) that can distinguish patients with BaSAC from those with EI.
Tijdsspanne: Day 1 and Day 5 after enrollement

Metabolites, as well as the ratio(s) or sum(s) of metabolites, with a median value that is significantly different between the two groups (BaSAC and EI) will be considered potential BMs for EI, after adjusting for potential sources of confounding (center, germ, etc.) and after correcting for Type I error inflation. The potential BM(s) may or may not be part of the metabolomic signature (see Primary Objective), as applicable.
Day 1 and Day 5 after enrollement
Describe changes in the metabolic signature in patients with endocarditis 5 days and 3 months after enrollment and correlate these changes with the diagnosis of IE.
Tijdsspanne: Day 1, Day 5, and Month 3 after enrollment

Proportion of patients in the endocarditis group in whom normalization of the metabolic signature was observed during follow-up (Day 5). Comparison of metabolite concentrations in the same patient across samples collected on Day 1, Day 5, and Month 3 to identify statistically significant changes in the levels of metabolites of interest. Normalization defined as a correlation with the normalization of clinical, laboratory, and microbiological parameters.
Day 1, Day 5, and Month 3 after enrollment
Diagnostic performance of the identified biomarker(s) in a subset of patients with "possible" endocarditis according to the Duke classification revised by the ISCVID in 2023.
Tijdsspanne: Day 1, Day 5, and Month 3 after enrollment

Calculation of sensitivity, specificity, positive predictive value, and negative predictive value of the identified biomarker(s) for the diagnosis of infective endocarditis at each time point considered (Day 1, Day 5, and Month 3). A panel of experts will serve as the gold standard for the diagnosis of infective endocarditis.
Day 1, Day 5, and Month 3 after enrollment
Conduct a sensitivity analysis on the correct classification of patients as "definite IE" according to the Duke classification revised by the ISCVID in 2023 by comparing it with the Duke and Li classification.
Tijdsspanne: Month 3 after enrollment

calculation of the proportion of discordant cases between "definite IE" cases according to the Duke classification revised by the ISCVID in 2023 and the Duke and Li classification.
Month 3 after enrollment

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

University Hospital, Angers

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

1 november 2026

Primaire voltooiing (Geschat)

1 november 2028

Studie voltooiing (Geschat)

1 november 2028

Studieregistratiedata

Eerst ingediend

21 oktober 2026

Eerst ingediend dat voldeed aan de QC-criteria

3 november 2026

Eerst geplaatst (Werkelijk)

4 november 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

4 november 2026

Laatste update ingediend die voldeed aan QC-criteria

3 november 2026

Laatst geverifieerd

1 november 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • 49RC24_0250
  • 2026-A00993-48 (Andere identificatie: ANSM)

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

JA

Beschrijving IPD-plan

Data will be shared upon reasonable request. Only de-identified data will be shared. Any data collected during the study may be shared. The protocol will be shared initially. Other documents may be shared at a later date upon request (e.g., the CRF to allow a collaborator to select the data they wish to access). The recipients of the data will be researchers. The data will be available for any purpose deemed relevant by the study investigator, based on a protocol provided by the requester, after verification of the obtaining of regulatory approvals, including the favorable opinion of an ethics committee.

IPD-tijdsbestek voor delen

The data will be shared after signing a negotiated data transfer agreement ( data access agreement), for the duration specified in the agreement.

IPD-toegangscriteria voor delen

The data will be made available via secure transfer (sharing platform approved by the university hospital: BlueFiles or Oodrive).

IPD delen Ondersteunend informatietype

  • LEERPROTOCOOL

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

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