Elsevier

American Heart Journal

Volume 150, Issue 5, November 2005, Pages 1086-1091
American Heart Journal

Clinical Investigation
Valvular and Congenital Heart Disease
The use and effect of surgical therapy for prosthetic valve infective endocarditis: A propensity analysis of a multicenter, international cohort

https://doi.org/10.1016/j.ahj.2005.01.023Get rights and content

Background

Although surgical intervention is often used in the treatment of prosthetic valve infective endocarditis (PVIE), an understanding of its effect on survival has been limited by the biases of observational studies and lack of controlled trials.

Methods

The International Collaboration on Endocarditis Merged Database is a large, multicenter, international registry of patients with definite endocarditis by Duke criteria, including 367 patients with PVIE. Clinical, microbiologic, and echocardiographic variables were analyzed to determine those factors associated with the use of surgery for PVIE. Logistic regression analysis was performed to create a propensity model of predictors of surgery use. Patients who underwent surgery during initial hospitalization were matched by propensity score with patients treated with medical therapy alone. Logistic regression analysis was performed to determine variables independently associated with inhospital mortality in this matched subset.

Results

Surgical therapy for PVIE was performed in 148 (42%) of 367 patients. Inhospital mortality was similar for patients treated with surgery compared with those treated with medical therapy alone (25.0% vs 23.4%, P = .729). Surgical therapy was independently associated with patient age, microorganism, intracardiac abscess, and congestive heart failure. After adjustment for these determinants, inhospital mortality was predicted by brain embolization (OR 11.12, 95% CI 4.16-29.73) and Staphylococcus aureus infection (OR 3.67, 95% CI 1.29-9.74), with a trend toward benefit for surgery (OR 0.56, 95% CI 0.23-1.36).

Conclusions

Despite the frequent use of surgery for the treatment of PVIE, this condition continues to be associated with a high inhospital mortality rate in the contemporary era. After adjustment for factors related to surgical intervention, brain embolism and S aureus infection were independently associated with inhospital mortality and a trend toward a survival benefit of surgery was evident.

Section snippets

Study population

Approval of research protocols by local institutional review boards were obtained at applicable sites. The methods used to create the International Collaboration on Endocarditis Merged Database (ICE-MD) have been described previously.13, 14 In brief, ICE investigators from 7 sites in 5 countries contributed prospectively collected data in an electronic format. The database from each center was provided to the coordinating center (Duke Clinical Research Institute) for characterization and

Results

Of 2212 patients in the merged database, definite PVIE was present in 355 (16.0%) patients without a history of injection drug use. Among these 355 patients with PVIE, 148 (42%) patients underwent cardiac surgery at a median time of 12 days from hospital admission. Clinical characteristics of this cohort and subgroups based on use of surgery are shown in Table I.

Inhospital complications of PVIE are depicted in Table II. Prosthetic valve infective endocarditis was associated with complications

Discussion

The present study, involving a large, multicenter, international cohort of patients with PVIE, offers important insights regarding the treatment and outcome of this condition. Despite contemporary diagnostic methods, including the Duke criteria16, 20 and use of transesophageal echocardiography, and modern surgical techniques at experienced centers, the inhospital mortality rate of PVIE remains high. In the current investigation, almost half of the patients with PVIE underwent cardiac surgery,

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      Cardiac conditions at the highest risk of IE do not all carry the same risk of IE (Table 1). Patients with previous IE have a risk of annual recurrence estimated at 20 to 60 per 1000 [29,30], while the incidence of IE is markedly lower in patients with a heart valve prosthesis, estimated at 3 to 12 per 1000 patient-years [5,54]. Therefore, the working group proposes to contraindicate dental implants in patients with a previous episode of IE.

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    Guest editor of this manuscript is Lawrence H. Cohn, MD.

    This study was supported in part by the following: American Heart Association GIA 0455802U (AW) and BGIA 0265405U (CHC); National Institutes of Health K23 AI-01647 (VGF) and K23 HL70861-01 (CHC); Tenet Healthcare Foundation (Santa Barbara, Calif) (EA); Red Española de Investigación en Patología Infecciosa (V-2003-REDC14A-O) (JMM); Fundación Privada Máximo Soriano Jiménez (Barcelona, Spain) (JMM); and Institut d'Investigacions Biomèdiques August Pii Sunyer (Barcelona, Spain) (JMM).

    Guest editor of this manuscript is Lawrence H. Con, MD. This study was supported in part of the following: American Heart Association GIA 0455802U (AW) and BGIA 0265405U (CHC), National Institutes of Health K23 AI-01647 (VGF) and K23 HL70861-01 (CHC), Tenet Healthcare Foundation (Santa Barbara, CA) (EA), Red Española de Investigación en Patología Infecciosa (V-2003-REDC14A-O) (JMM), Fundación Privada Máximo Soriano Jiménez (Barcelona, Spain) (JMM), and Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS, Barcelona Spain) (JMM).

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    The International Collaboration on Endocarditis Merged Database (ICE-MD) Study Group (see Appendix).

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