DOI: 10.1007/s00259-018-4142-9Pages: 194-205

Contribution of PET imaging to mortality risk stratification in candidates to lead extraction for pacemaker or defibrillator infection: a prospective single center study

1. University of Bologna, Policlinico S.Orsola-Malpighi, Institute of Cardiology, Department of Experimental, Diagnostic and Specialty Medicine

2. University of Bologna, Policlinico S.Orsola-Malpighi, Institute of Nuclear Medicine, Department of Experimental, Diagnostic and Specialty Medicine

3. University of Modena and Reggio Emilia, Policlinico di Modena, Cardiology Division, Department of Diagnostics, Clinical and Public Health Medicine

Correspondence to:
Igor Diemberger
Tel: +39-051349858
Email: igor.diemberger@unibo.it

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Abstract

Purpose

18F-FDG PET/CT is an emerging technique for diagnosis of cardiac implantable electronic devices infection (CIEDI). Despite the improvements in transvenous lead extraction (TLE), long-term survival in patients with CIEDI is poor. The aim of the present study was to evaluate whether the extension of CIEDI at 18F-FDG PET/CT can improve prediction of survival after TLE.

Methods

Prospective, monocentric observational study enrolling consecutive candidates to TLE for a diagnosis of CIEDI. 18F-FDG PET/CT was performed in all patients prior TLE.

Results

There were 105 consecutive patients with confirmed CIEDI enrolled. An increased 18F-FDG uptake was limited to cardiac implantable electrical device (CIED) pocket in 56 patients, 40 patients had a systemic involvement. We had nine negative PET in patients undergoing prolonged antimicrobial therapy (22.5 ± 14.0 days vs. 8.6 ± 13.0 days; p = 0.005). Implementation of 18F-FDG PET/CT in modified Duke Criteria lead to reclassification of 23.8% of the patients. After a mean follow-up of 25.0 ± 9.0 months, 31 patients died (29.5%). Patients with CIED pocket involvement at 18F-FDG PET/CT presented a better survival independently of presence/absence of systemic involvement (HR 0.493, 95%CI 0.240–0.984; p = 0.048). After integration of 18F-FDG PET/CT data, absence of overt/hidden pocket involvement in CIEDI and a (glomerular filtration rate) GFR < 60 ml/min were the only independent predictors of mortality at long term.

Conclusions

Patient with CIEDI and a Cold Closed Pocket (i.e., a CIED pocket without skin erosion/perforation nor increased capitation at 18F-FDG PET/CT) present worse long-term survival. Patient management can benefit by systematic adoption of pre-TLE 18F-FDG PET/CT through improved identification of CIED related endocarditis (CIEDIE) and hidden involvement of CIED pocket.

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  • Accepted: Aug 19, 2018
  • Online: Sep 8, 2018

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