Pacemaker Infection and Parvimonas micra-Induced Prosthetic Aortic Valve Endocarditis With Periannular Abscess: A Case Report.

A 59-year-old man was admitted for a prosthetic aortic valve (AV)infectious endocarditis (IE), attributed to the pacemaker and complicated by a circumferential periaortic circulating abscess, a severe aortic periprosthetic leak, and left-sided heart failure. Blood cultures were negative on hospital day 3. He underwent an emergent AV biological valve replacement, and 16S rRNA bacterial gene sequencing performed on AV tissue identified the microorganism as Parvimonas micra. We reviewed the 11 cases of Parvimonas micra IE previously described. Some features seem to be abnormally frequent in this context: history of prosthetic valve or cardiac device, pacemaker infection, periannular abscess, and chronic dental infection.