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Background:  Although the causative pathogens in cardiac implantable electronic device (CIED) infections are well known, the relationship between time after implantation and infection patterns has not been sufficiently investigated. This study investigated the microbiology and onset of CIED infections according to infection patterns.  Methods and Results:  This retrospective study included 97 patients who underwent CIED removal due to device-related infections between April 2009 and December 2018. After device implantation, infections peaked in the first year and declined gradually over 10 years. Most infections (&gt;60%) occurred within 5 years. Staphylococcal infections, the predominant form of CIED infections, occurred throughout the study period. CIED infections were categorized as systemic (SI; n=26) or local (LI; n=71) infections according to clinical presentation, and as CIED pocket-related (PR; n=85) and non-pocket-related (non-PR; n=12) infections according to the pathogenic pathway. The main causative pathogen in SI was Staphylococcus aureus , whereas coagulase-negative staphylococci were mainly related to LI. Both SI and LI peaked in the first year after implantation and then decreased gradually. There was no significant microbiological difference between PR and non-PR infections. PR infections showed the same temporal distribution as the overall cohort. However, non-PR infections exhibited a uniform temporal distribution after the first year.  Conclusions:  The severity of CIED infections depends on the causative pathogen, whereas their temporal distribution is affected by the microbiological intrusion pathway.

Temporal and Microbiological Analysis of Cardiac Implantable Electrical Device Infections ― A Retrospective Study ―