Key result
De novo and replacement CIED pockets share similar microbiomes, suggesting transient contamination over stable colonization.
Why the study?
The source of bacteria detected in CIED pockets—whether true colonisation or intraoperative contamination—has significant implications for infection prevention strategies.
Does the intraoperative microbiome differ between de novo pacemaker implantation and generator replacement in asymptomatic patients?
Observational (n=18)
No
Does the intraoperative microbiome differ between de novo pacemaker implantation and generator replacement in asymptomatic patients?
p-value: p=>0.05
The absence of distinct microbial signatures in replacement versus de novo CIED pockets suggests that detected bacteria represent transient intraoperative contamination rather than stable colonization, emphasizing the importance of strict aseptic technique.
Supports standard perioperative antisepsis without added decolonization; leaves open whether transient contamination drives CIED infection risk.
Background The source of bacteria detected in cardiac implantable electronic device (CIED) pockets—whether true colonisation or intraoperative contamination—has significant implications for infection prevention strategies. Aim To compare intraoperative microbial dynamics during de novo pacemaker implantation versus generator replacement using 16S rRNA gene sequencing. Methods In this prospective study, samples were collected from 18 asymptomatic patients (11 new implants, seven replacements) at three timepoints: skin before incision (T1), pocket after creation (T2), and pocket before closure (T3). Microbiome analysis was performed via 16S rRNA gene sequencing of the V3-V4 region. α-diversity (Simpson index) and β-diversity (Bray–Curtis dissimilarity) were analysed. Findings Microbial community composition and relative abundance were similar between groups at all timepoints. Predominant genera included A chromobacter, Pedobacter, Pseudomonas, Acinetobacter, Blastococcus, and Paracoccus . No significant differences in α- or β-diversity were found between new and replacement groups at T2 and T3. The only significant difference was a higher α-diversity at T1 (skin) in the new implantation group ( P = 0.037), likely reflecting age-related skin flora differences. No patient developed a clinical infection during follow-up (mean 9.4 ± 1.8 months). Conclusion The absence of distinct microbial signatures in replacement pockets and the prevalence of environmental bacteria strongly suggest that detected microorganisms originate from intraoperative contamination. This underscores the paramount importance of rigorous aseptic technique over surveillance for colonization in preventing CIED infections.
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Xu et al. (2026) conducted an observational in Asymptomatic patients undergoing cardiac implantable electronic device surgery (n=18). Generator replacement vs. De novo pacemaker implantation was evaluated on Alpha and beta diversity of intraoperative microbiomes at pocket creation and before closure (p=>0.05). Intraoperative microbial community composition and diversity were similar between de novo and replacement cardiac implantable electronic device pockets, suggesting detected bacteria originate from transient contamination rather than stable colonization.
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