1075. A retrospective comparison of native valve endocarditis and prosthetic valve endocarditis in a large tertiary care teaching hospital from 2007-2015
Session: Poster Abstract Session: Bacteremia and Endocarditis
Friday, October 5, 2018
Room: S Poster Hall
  • IDSA IDweek 2018 Poster presentation_HoiYeeAnnieLo_IE.pdf (356.9 kB)
  • Background: Studies comparing native valve and prosthetic valve endocarditis (NVE and PVE) have mixed findings on the risk factors and outcomes between the two cohorts. This retrospective review of infective endocarditis (IE) at a teaching hospital in the US aims to compare the clinical and microbiological features between NVE and PVE.

    Methods: Patients were retrospectively identified from 2007-2015 using appropriate IE-related ICD-9 codes. Cases that met definite Modified Duke Criteria for IE were further classified as either PVE or NVE, and were reviewed for epidemiology, causative organism(s), affected valves and associations, risk factors, dental procedures in the past 6 months, and 30-day mortality.

    Results: 363 admissions met criteria for definite endocarditis, with 261 NVE cases and 59 PVE cases. Forty-three cases that were either associated with an infection involving both native and prosthetic valves or intracardiac devices were omitted from this study. Most risk factors, such as hemodialysis and intravenous drug use did not show any significant difference amongst the two groups. IE involving the aortic valve as well as a previous history of IE were more likely to be seen in PVE (both p<0.0001). Dental procedures done in the preceding 6 months before IE admission were more likely to be associated with PVE than NVE (p=0.0043). PVE showed a higher likelihood of 30 day mortality compared to NVE (p=0.067). The causative organisms of PVE were more likely to be caused by common gut pathogens such as Klebsiella and Enterobacter species.

    Conclusion: PVE cases had a significantly higher chance of involving the aortic valve as well as having a history of IE. PVE cases were also significantly more likely to be associated with a dental procedure done in the preceding 6 months than with the NVE cases. This implies that patients with prosthetic valves, who are currently covered under the 2007 AHA guidelines to receive prophylaxis prior to dental procedures, are still at a high risk of developing PVE. It may be prudent to reconsider adding a post-procedure dose of antibiotics, instead of a single pre-procedure dose, to extend the protection of this high risk population with prosthetic valves. Furthermore, PVE cases showed higher rates of 30 day mortality compared to NVE with near significance, which is likely multifactorial.

    Hoi Yee Annie Lo, MD Class of 20191, Anahita Mostaghim, MD1 and Nancy Khardori, MD, FIDSA2, (1)Eastern Virginia Medical School, Norfolk, VA, (2)Internal Medicine, Division of Infectious Disease, Eastern Virginia Medical School, Norfolk, VA


    H. Y. A. Lo, None

    A. Mostaghim, None

    N. Khardori, None

    Findings in the abstracts are embargoed until 12:01 a.m. PDT, Wednesday Oct. 3rd with the exception of research findings presented at the IDWeek press conferences.