Rate, Time Course, and Predictors of Implantable Cardioverter Defibrillator Infections: An Analysis From the SIMPLE...

Area of Science:

• Cardiology
• Medical Devices
• Infectious Disease

Background:

• Implantable cardioverter defibrillator (ICD) infections are rising due to increased device implants, sicker patients, and more frequent replacements.
• Understanding ICD infection rates and predictors is crucial for reducing morbidity, mortality, and costs.

Purpose of the Study:

• To evaluate the incidence and predictors of ICD infections in a large cohort of patients.
• To assess the impact of defibrillation testing on ICD infection rates.

Main Methods:

• The Shock Implant Evaluation Trial (SIMPLE) randomized 2500 ICD recipients.
• Patients were followed for an average of 3.1 years, with infections defined as requiring device removal or antibiotics.
• Defibrillation testing was performed in some patients.

Main Results:

• Within 24 months, 0.8% of patients developed ICD infection, with most cases occurring within 30 days.
• Primary electrical disorders and secondary prevention indications were associated with higher infection risk.
• ICD wound hematoma (2.2% of patients) led to infection in 10.4%, and ICD reintervention (8.3%) led to infection in 1.9%.

Conclusions:

• ICD recipients at high-volume centers have a low risk of device-related infection.
• Strategies to minimize wound hematoma and reduce the need for ICD reintervention can further decrease infection rates.