Epidemiology of infective endocarditis in transcatheter aortic valve replacement: systemic review and meta-analysis

Transcatheter aortic valve implantation: Association between skin flora and infective endocarditis?

BACKGROUND

Infective endocarditis is a rare but severe complication that may arise following transcatheter aortic valve implantation. Recent advances in microbiological epidemiology have highlighted staphylococci and enterococci as the primary pathogens involved.

AIM

To investigate the prevalence of these bacteria in patients' cutaneous flora before and after transcatheter aortic valve implantation procedures, and to assess the implications for antibiotic prophylaxis recommendations.

METHODS

A single-centre prospective epidemiological study was conducted, enrolling patients admitted consecutively for transcatheter aortic valve implantation procedures between June 2021 and February 2022. Cutaneous samples were obtained from each patient at the puncture site of the transcatheter aortic valve implantation procedure, before and after skin detersion, and from operator hands after skin detersion.

RESULTS

One hundred patients were included, with a mean age of 82±6.1years, a male-to-female ratio of 0.48 and a mean body mass index of 29±4.4kg/m2. Before skin detersion, cutaneous samples were positive in 58 patients; among them were coagulase-negative staphylococci (n=48, 82%, 95% confidence interval 71-91%), enterococci (n=12, 21%, 95% confidence interval: 11-33%), Staphylococcus aureus (n=2, 3%, 95% confidence interval 0-12%) and Enterobacteriaceae (n=4, 7%, 95% confidence interval: 2-17%).

CONCLUSIONS

Enterococci are frequently present in patients' cutaneous flora at the puncture site before skin detersion, suggesting a potential source for infective endocarditis after transcatheter aortic valve implantation. These findings support considering amoxicillin-clavulanate as antibiotic prophylaxis before transcatheter aortic valve implantation procedures to mitigate the risk of infective endocarditis associated with enterococcal colonization.

Surgical Approach for TAVI Replacement in Endocarditis: A Descriptive Technique

Background/Objectives: Transcatheter Aortic Valve Implantation (TAVI) has significantly improved the management of aortic valve disease, but post-TAVI infective endocarditis, occurring in 0.5-3.1% of cases, remains a serious complication. Due to a high mortality rate and technical challenges, surgical replacement of infected TAVI prosthetic valves is performed in only 11.4% of cases. Methods: This case describes a standardized surgical technique for the removal and replacement of self-expanding TAVI prosthetic valves in the case of infective endocarditis. Results: The proposed approach aims to facilitate valve explantation while minimizing surgical risks. Conclusions: We believe that this technique could be particularly beneficial for surgeons managing these complex cases, by reducing surgical complications and improving patient outcomes. Further studies are necessary to validate its long-term efficacy and applicability in broader clinical settings.

Infection of Transcatheter Valvular Devices

PURPOSE OF REVIEW

This review explores the epidemiology, clinical traits, and diagnosis of Transcatheter Aortic Valve Replacement-Associated Infective Endocarditis (TAVR-IE) and mitral transcatheter edge-to-edge repair infective endocarditis (TEER-IE), focusing on a multimodal imaging approach. It addresses the rising prevalence of TAVR and TEER, emphasizing the need to understand long-term complications and clinical consequences, which poses significant challenges despite advancements in valve technology.

RECENT FINDINGS

Studies report a variable incidence of TAVR-IE and TEER-IE influenced by diverse patient risk profiles and procedural factors. Younger age, male gender, and certain comorbidities emerge as patient-related risk factors. Procedure-related factors include intervention location, valve type, and technical aspects. Microbiologically, Staphylococcus aureus, Viridans Group Streptococcus, and Enterococcus are frequently encountered pathogens. TAVR-IE and TEER-IE diagnosis involves a multimodal imaging approach due to limitations in echocardiography. Blood cultures and imaging aid identification, with Fluorescence in situ hybridization is showing promise. Treatment encompasses medical management with antibiotics and, when necessary, surgical intervention. The management approach requires a multidisciplinary "Endocarditis Team." This review underscores the need for continued research to refine risk prediction, enhance diagnostic accuracy, and optimize management strategies for TAVR-IE, considering the evolving landscape of transcatheter interventions.

Endocarditis after Transcatheter Aortic Valve Replacement

Transcatheter aortic valve replacement (TAVR) use is gaining momentum as the mainstay for the treatment of aortic stenosis compared to surgical aortic valve replacement (SAVR). Unfortunately, TAVR-related infective endocarditis (TAVR-IE) is expected to be detected more and more as a result of the ever-expanding indications in younger patients. Given the overall poor prognosis of TAVR-IE, it is imperative that clinicians familiarize themselves with common presentations, major risk factors, diagnostic pitfalls, therapeutic approaches, and the prevention of TAVR-IE. Herein, we review all of the above in detail with the most updated available literature.

Infective Endocarditis-Update for the Perioperative Clinician

Infective endocarditis is a common pathology routinely encountered by perioperative physicians. There has been a need for a comprehensive review of this important topic. In this expert review, the authors discuss in detail the incidence, etiology, definition, microbiology, and trends of infective endocarditis. The authors discuss the clinical and imaging criteria for diagnosing infective endocarditis and the perioperative considerations for the same. Other imaging modalities to evaluate infective endocarditis also are discussed. Furthermore, the authors describe in detail the clinical risk scores that are used for determining clinical prognostic criteria and how they are tied to the current societal guidelines. Knowledge about native and prosthetic valve endocarditis, with emphasis on the timing of surgical intervention-focused surgical approaches and analysis of current outcomes, are critical to managing such patients, especially high-risk patients like those with heart failure, patients with intravenous drug abuse, and with internal pacemakers and defibrillators in situ. And lastly, with the advancement of percutaneous transcatheter valves becoming a norm for the management of various valvular pathologies, the authors discuss an in-depth review of transcatheter valve endocarditis with a focus on its incidence, the timing of surgical interventions, outcome data, and management of high-risk patients.

Infective Endocarditis after Transcatheter Aortic Valve Replacement: Challenges in the Diagnosis and Management

Although initially conceived for high-risk patients who are ineligible for surgical aortic valve replacement (SAVR), transcatheter aortic valve replacement (TAVR) is now recommended in a wider spectrum of indications, including among young patients. However, similar to SAVR, TAVR is also associated with a risk of infectious complications, namely, prosthetic valve endocarditis (PVE). As the number of performed TAVR procedures increases, and despite the low incidence of PVE post-TAVR, clinicians should be familiar with its associated risk factors and clinical presentation. Whereas the diagnosis of native valve endocarditis can be achieved straightforwardly by applying the modified Duke criteria, the diagnosis of PVE is more challenging given its atypical symptoms, the lower sensitivity of the criteria involved, and the low diagnostic yield of conventional echocardiography. Delay in proper management can be associated with increased morbidity and mortality. Therefore, clinicians should have a high index of suspicion and initiate proper work-up according to the severity of the illness, the underlying host, and the local epidemiology of the causative organisms. The most common causative pathogens are Gram-positive bacteria such as Staphylococcus aureus, coagulase-negative staphylococci, Enterococcus spp., and Streptococcus spp. (particularly the viridans group), while less-likely causative pathogens include Gram-negative and fungal pathogens. The high prevalence of antimicrobial resistance complicates the choice of therapy. There remain controversies regarding the optimal management strategies including indications for surgical interventions. Surgical assessment is recommended early in the course of illness and surgical intervention should be considered in selected patients. As in other PVE, the duration of therapy depends on the isolated pathogen, the host, and the clinical response. Since TAVR is a relatively new procedure, the outcome of TAVR-PVE is yet to be fully understood.

Incidence and outcomes of infective endocarditis following transcatheter aortic valve implantation

INTRODUCTION

Prosthetic valve infective endocarditis is a feared and potentially catastrophic complication of valvular intervention. Transcatheter aortic valve implantation has transformed the modern management of aortic stenosis and vastly altered the demographics of those patients undergoing valve replacement.

AREAS COVERED

As a relatively nascent development, what TAVI means for the epidemiology of infective endocarditis, how to identify those patients undergoing the procedure at greatest risk, and how best to prevent and manage the condition remains the subject of fervent research activity. In this review, we appraise relevant contemporary data discussing the incidence, microbiological profiles, associated risk factors and clinical outcomes of infective endocarditis after TAVI.

EXPERT OPINION

Present outcomes are poor, with exceedingly high in-hospital and long-term mortality. Evidence to support surgical management in this patient group is lacking. Prevention is therefore paramount and a logical focus for future research attention.