Leadless Pacemaker Implantation in Prosthetic Valve Endocarditis Patient: Lesson with the Micra Transcatheter Pacemaker
Santomauro Maurizio1, Santomauro Andrea2, Rapacciuolo Antonio3, Riganti Carla4, Francesco Maffettone4, Fiore Francesco4, Iengo Martina4, Chiappetti Rosaria4, Cacciatore Francesco1*,
1Department of Cardiovascular Emergency, Internal Medicine and Geriatric, Medical School, Federico II University of Naples, Italy
2Department of Medicine, Surgey, Dentistry, Salernitana Medical School, Italy
3Department of Advanced Biomedical Sciences, Federico II University of Naples, Italy
4University of Naples, "Federico II", Italy
5Cotugno Hospital, cardiology department, Naples, Italy
*Corresponding author: Francesco Cacciatore, Department of Cardiovascular Emergency, Internal Medicine and Geriatric, Medical School, Federico II University of Naples, Italy.
Received: 22 November 2021; Accepted: 29 November 2021; Published: 13 December 2021
Citation: Santomauro M, Santomauro A, Rapacciuolo A, Riganti C, Maffettone F, Fiore F, Iengo M, Chiappetti R, Cacciatore F. Leadless Pacemaker Implantation in Prosthetic Valve Endocarditis patient: lesson with the Micra Transcatheter Pacemaker. Cardiology and Cardiovascular Medicine 5 (2021): 704-707.Share at Facebook
Leadless Pacemakers (L-PM) are an effective alternative for patients requiring only ventricular pacing, with a low major complication rates and long-term complications given the absence of leads and a device pocket. Successful implantation from the septal location has been described using the Micra Transcatheter Pacing System (TPS) (Medtronic Inc, Minneapolis, MN) introducer sheath, a Micra delivery catheter, or a steerable sheath that allows better alignment with the device and a loop snare. We report the case of a patient with a leadless pacemaker implantation because of atrial fibrillation with low ventricular response with an endocarditis on prosthetic mechanical mitral valve.
Prosthetic Valve Endocarditis; Micra Transcatheter Pacemaker
1. Case report
A 79-year-old woman was referred from a periferical hospital of our Region (Campania, Italy) for a single-chamber pacemaker implant because of recurrent syncope in permanent slow rate atrial fibrillation. The patient implanted in 1984 a Sorin 27 monoleaflet Prostetic Mitral Valve (PMV). After 6 months a prolonged antibiotic treatment (3 months) was administred because of endocarditis on prosthetic mitral valve. The blood culture performed in the periferical hospital was positive for Staphylococcus aureus sensitive to tigecycline and levofloxacin that were initiated soon after blood culture result. We decided to further evaluate the PMV as a potential source of infection, and transthoracic (Figure 1, Panel A and B) and then transesophageal echo showed a vegetation of 13 x 7 mm on the ventricular face adhered partly to the annulus of the prosthesis and partly to the ventricular wall frond-like material on the surface of the PMV. PET-TC (after 10 days of antibiotic therapy) showed an increase in metabolic FDG activity around the prostetic valve with a SUVmax of 3.8. All the subsequent 5 blood-culture performed during hospitalization resulted negative. The patient received a Micra VR leadless cardiac pacemaker (Medtronic Inc) to try to minimize the risk of possible future infection. (Figure 2A, 2B, 2C, 2D) (Figure 3).
L-PM have shown resistance to infection even when inserted at the time of or shortly after conventional system extraction [1-6]. A 2019 e-mail advertisement from Medtronic reports that a total of 50,000 Micras have been implanted worldwide. To date there has been only 1 other case report of documented Micra infection. L-PM are felt to be resistant to infection owing to the lower surface area, no device pocket, turbulent right ventricular flow, and subsequent device encapsulation. The Micra transcatheter pacemaker is largely encased titanium with a parylene coating. A recent study by El-Chami and colleagues  documented that the perylene coating on titanium provided bacterial resistance to Stafilococcus aureus and Pseudomonas aeruginosa compared to bare titanium and postulated this to be a potential mechanism of the devices bacterial resistance. A substudy of the Micra Transcatheter Pacing study reviewed the incidence and outcomes of patients who developed serious infectious events (bacteremia or endocarditis) after Micra implantation [8-11]. Among the 720 patients implanted in the investigational trial, 15 patients had 21 serious infectious events. All events were adjudicated and determined to be unrelated to Micra device or implant procedure, and no persistent bacteremia was seen after antibiotic treatment.
Leadless pacemakers were recently introduced to address lead and pocket-related complications. In cases such as the presented one, a leadless pacemaker avoid possible source of prosthetic valve endocarditis in somebody already susceptible to it.
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