Complicated infective endocarditis of the bioprosthetic mitral valve following the transcatheter mitral valve-in-valve procedure: a case report and literature review.

Background: Since the transcatheter valve-in-valve (ViV) procedure was introduced in 2007, a few cases of infective endocarditis (IE) following the ViV procedure have been reported, which can be predisposed by older age, pre-existing medical conditions, and procedural techniques. Paravalvular abscesses constitute a rare complication of IE, resulting from extending IE beyond the valve annulus, less commonly caused by species. This complication is more common in prosthetic valves, particularly bioprosthetic valves.

Case Summary: We describe a 75-year-old woman with Churg-Strauss syndrome and diabetes mellitus who underwent surgical replacement of bioprosthetic aortic and mitral valves 11 years ago. One year ago, she had a transcatheter mitral ViV procedure due to bioprosthetic mitral valve degeneration. The patient was referred to our centre with fatigue and fever, alongside elevated white blood cell count, erythrocyte sedimentation rate, and C-reactive protein. Blood and urine cultures tested positive for . Echocardiographic assessments revealed a paravalvular abscess (13 × 8 mm) in the posterolateral side of the bioprosthetic mitral valve, fistulized into the left ventricle. The patient received treatment with vancomycin, meropenem, and colistin and was a candidate for surgery. Eleven days after the patient's admission, she passed away.

Discussion: This study underscores the novelty of IE complicated with paravalvular abscess following the ViV procedure. In such cases, a multidisciplinary approach and timely surgical interventions are crucial for optimal patient outcomes.