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Christopher H. Cabell, MD; James G. Jollis, MD; Gail E. Peterson, MD; G. Ralph Corey, MD; Deverick J. Anderson, MD; Daniel J. Sexton, MD; Christopher W. Woods, MD; L. Barth Reller, MD; Thomas Ryan, MD; Vance G. Fowler, Jr, MD, MHS

Arch Intern Med. 2002;162:90-94.

Background  Limited data exist on recent demographic and microbiological changes in infective endocarditis (IE) and the impact of these changes on patient survival.

Methods  Data were collected from all patients with definite or possible IE at Duke University Medical Center, Durham, NC, from 1993 to 1999. Logistic regression analysis was used to identify demographic and microbiological changes that occurred in patients with IE over the study period. The impact of these changes on survival was evaluated using Cox proportional hazards modeling.

Results  Among the 329 study patients, rates of hemodialysis dependence, immunosuppression, and Staphylococcus aureus infection increased during the study period (P= .04, P= .008, and P<.001, respectively), while rates of infection due to viridans group streptococci decreased (P= .007). Hemodialysis was independently associated with S aureus infection (odds ratio, 3.1; 95% confidence interval, 1.6-5.9). Patients with S aureus IE had a higher 1-year mortality rate (43.9% vs 32.5%; P= .04) that persisted after adjustment for other illness severity characteristics (hazard ratio, 1.5; 95% confidence interval, 1.03-2.3).

Conclusions  The demographic and microbiological characteristics of IE at our institution have changed over the past decade in ways that suggest a link between medical practice and IE characteristics. Staphylococcus aureus has emerged as a dominant cause of IE, and is an independent predictor of mortality. These findings identify clinical settings that may warrant closer surveillance and more aggressive measures in the identification and prevention of endocarditis.

From the Department of Medicine, Duke University School of Medicine (Drs Cabell, Jollis, Peterson, Corey, Anderson, Sexton, Woods, Reller, Ryan, and Fowler), Duke Clinical Research Institute (Drs Cabell and Jollis), and Durham Veterans Administration Medical Center (Dr Peterson), Durham, NC.

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