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Ann Thorac Surg 1997;63:1737-1741
© 1997 The Society of Thoracic Surgeons
Department of Thoracic and Cardiovascular Surgery, Pitie's Hospital, Paris, France
Accepted for publication December 26, 1996.
| Abstract |
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Methods. There were 201 male and 46 female patients (mean age, 45.4 ± 6 years). The aortic valve was involved in 163 cases, the mitral valve in 36 cases, both mitral and aortic valves in 44 cases, and the tricuspid valve alone in 4 cases. The most common microorganisms were streptococci. Univariate Pearson (
2 test) and multivariate (stepwise logistic regression [BMDPLR]) analyses were used to identify significant predictors of operative mortality, reoperation, and recurrent endocarditis. Cox proportional hazards regression model was used to study late survival.
Results. Operative mortality was 7.6% (n = 19). Increased age, cardiogenic shock at the time of operation, insidious illness, and greater thoracic ratio (>0.5) were the predominant risk factors; the length of antibiotic therapy appeared to have no influence. Two hundred thirteen patients were followed up. Median follow-up time was 6 years (range, 2 to 19 years). Overall survival rate (operative mortality excluded) was 71.3% ± 3.8% at 9 years. Increased age, preoperative neurologic complications, cardiogenic shock at the time of operation, shorter duration of the illness, insidious illness before the operation, and mitral valve endocarditis were the predominant risk factors for late mortality. The probability of freedom from reoperation (operative mortality included) was 73.3% ± 4.2% at 8 years; risk factors were younger age and aortic valve endocarditis. The rate of prosthetic valve endocarditis was 7%. No significant risk factor was found.
Conclusions. Increased age, insidious illness, and hemodynamic failure are the main risk factors for operative mortality. Long-term survival is good except for patients with preoperative neurologic complications and mitral valve endocarditis.
| Introduction |
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| Patients and Methods |
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Endocarditis was labeled active if the patient required an operation before completion of a standard course of antibiotic treatment, irrespective of whether there were ongoing signs of sepsis, or whether blood and valve cultures were positive for the infective microorganism. The duration of antibiotic treatment was dependent on the severity of the sepsis and the responsible microorganism [4]. Early prosthetic valve endocarditis (PVE) was present if recurrent or persistent endocarditis occurred within 60 days after the operation; endocarditis occurring after 60 days was labeled late PVE. Histopathologic findings confirmed the diagnosis in all the cases.
Operative mortality was defined as death occurring within the same hospitalization after the operation.
Data were obtained from hospital records. Data on outcome after discharge and clinical status at follow-up were obtained by questionnaires. Complications were confirmed by contacting the referring physician. Follow-up was 95% complete; the total follow-up time was 1,160 patient-years. Median follow-up was 6 years.
| Statistical Analysis |
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2 test) and multivariate (stepwise logistic regression [BMDPLR]) analyses were used to identify significant predictors of operative mortality, reoperation, and recurrent endocarditis. The list of variables is shown in Appendix 1. Kaplan-Meier survival curves were used for analysis of long-term survival, freedom from reoperation, and freedom from recurrent endocarditis. A combination of variables related to late survival was examined using a Cox proportional hazards regression model. All the covariates, except echocardiographic data, were included in the multivariate analyses. Statistical significance was defined as a value of p less than 0.05. | Preoperative Patient Characteristics |
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Bacteriologic findings are listed in Table 1
. Seventy-four patients (29.9%) had negative blood cultures; most of them had received antibiotic therapy before referral to our hospital. The duration of antibiotic therapy before the operation was between 1 and 15 days in 56 patients, between 15 and 30 days in 92 patients, and between 30 and 40 days in 81 patients. Sixteen patients received no antibiotic therapy because of urgency or misdiagnosis. The average duration of antibiotic administration was 24.6 days.
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Six patients were in cardiogenic shock at the time of the operation and required inotropic support. Five patients needed mechanical ventilation.
Neurologic complications related to endocarditis occurred in 26 patients: brain abscess in 1, meningitis in 4, mycotic aneurysm in 1, and stroke in 20. There was no hemorrhagic infarct.
The diagnosis of coronary arterial embolism was made in 5 young patients who had electrocardiographic and echocardiographic signs of acute myocardial infarction.
Mean cardiothoracic ratio was 0.53 ± 5.6 (range, 0.4 to 0.9). It was greater than 0.5 in 155 cases, and 0.5 or less in 92 patients.
Echocardiographic data were available in 193 patients: mean left ventricular telediastolic diameter was 61.5 ± 10.5 mm (range, 60 to 90 mm), and mean left ventricular telesystolic diameter was 40.3 ± 8.7 mm (range, 10 to 80 mm). Aortic annulus abscesses were detected preoperatively in 20 patients by transesophageal echocardiography.
The predominant indication for operation was progressive hemodynamic compromise (77% of patients).
| Surgical Findings |
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Tissue and valve cultures tested positive for infection in 31 cases (13%).
| Results |
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| Follow-up |
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Overall survival rate (operative mortality excluded) was 71.3% ± 3.8% at 9 years (Fig 1
). Univariate and multivariate analyses (Tables 4, 5![]()
) showed that increased age (>60 years), shorter duration of illness before the operation, insidious illness, cardiogenic shock at the time of the operation, preoperative neurologic complications, and mitral valve endocarditis were the predominant risk factors.
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| Comment |
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We find no statistical difference in operative mortality according to the microorganism; operative mortality has been reported higher with staphylococci [5], but our subgroup is perhaps too small to show this result. The length of antibiotic therapy before the operation appears to have no influence on operative mortality, as in Jubair and associates' report [6]. Preoperative neurologic complications play no role in operative mortality in our data; their incidence (10.5%) is lower here than in other reports [7]. Patients with cerebral events were screened preoperatively by computed tomographic scan. In case of an ischemic stroke without surrounding edema, the operation was not delayed; if there was a brain hemorrhage, patients were not operated on during the acute phase of the endocarditis. This policy can explain our results. Ting and associates [8] also have shown that operative mortality is increased in the presence of a preoperative hemorrhagic infarct but not in the presence of an ischemic infarct.
Congestive heart failure has been shown to be an important prognostic indicator of death [2, 3, 9]. Univariate and multivariate analyses show in this report that patients in cardiogenic shock are at a higher risk of death. New York Heart Association functional class and left ventricular echocardiographic diameter were not significantly correlated to operative mortality; New York Heart Association functional class is perhaps not too accurate to evaluate hemodynamic status. Echocardiographic data were available in only 193 patients, and were excluded from the multivariate analysis for this reason. In contrast, cardiothoracic ratio is well correlated to operative mortality, but we have not studied the relation with pericardial effusion.
The insidious, unknown evolution of the disease is a risk factor; in this group, patients who lived in poor social conditions came later to operation and were in a worse general and hemodynamic status at this time.
Increased age is another risk factor, as shown by multivariate analysis. Age remains a concern in Western countries: their population is becoming older, and a ninefold increased rate of endocarditis has been reported by Steckelberg and associates [10] in patients older than 65 years. Coronary artery disease should be studied in these patients. The presence of an annular abscess and the type of repair play no role in operative mortality. Ring abscesses were present in 21.8% of aortic and 2.5% of mitral valves (35% and 2% in Middlemost and colleagues' report [11]). They are best detected by transesophageal echocardiography [12]. Extensive destruction of the aortic root is uncommon in NVE, and abscesses can be usually repaired by pericardial patches. Only two extraannular procedures were used in this report (1 subcoronary valved conduit and 1 intraatrial prosthesis).
Overall long-term survival (operative mortality excluded) is good: 71.3% ± 3.8% at 9 years. Risk factors are shown in Tables 4 and 5![]()
. Shorter duration of the illness is also associated in Steckelberg and associates' report [10] with a higher case fatality rate; insidious illness as a risk factor for both early and late mortality has been discussed above. The lack of preoperative antibiotic therapy is a risk factor for poor long-term survival, but it seems related rather to hemodynamic instability and urgency than to the lack of antibiotics itself.
Neurologic complications appear to have some influence on the late outcome: severe neurologic sequelae can lead to death. Anticoagulation therapy can be difficult to manage in these patients. Preventing cerebral embolism remains a challenge: Steckelberg and colleagues [13] showed that the rate of embolic events declines over time, falling from 13 per 1,000 patient-days during the first week of therapy to less than 1.2 per 1,000 patient-days after completion of the second week of therapy, but ischemic stroke can reveal endocarditis. Preventing embolism by aspirin is being studied by a Canadian trial [14]; no patient received aspirin preoperatively in this study.
Mitral valve localization is a risk factor for late mortality, perhaps because of a higher rate of complications with mitral valve replacement. Conservative treatment and use of partial homografts can be of great interest [15]. In our series, the mitral valve was too destroyed, and these techniques could not be used.
During the follow-up, reoperation was necessary in 38 cases. Interpretation of the significance of the different variables is difficult, because there are many different and mixed causes. It seems, however, that younger age and aortic valve endocarditis are the predominant risk factors. In these data, annular abscesses at the first operation have no influence on the rate of reoperation, perhaps because of the absence of extensive aortic root destruction.
Three patients had early PVE and 13 had late PVE. The rate of recurrent endocarditis was 7%. Some authors have incriminated the use of mechanical valves. But Grover and associates [16] found no difference in the susceptibility of mechanical versus bioprosthetic valves to the development of endocarditis. The use of homografts in the aortic position could reduce the incidence of endocarditis, especially in the first 6 weeks postoperatively [9, 17] but we do not have experience with this. Operation during the acute phase of the endocarditis has been suspected to predispose to early PVE [16]. Aranki and associates found the same result for aortic [2] but not for mitral endocarditis [18]. Like Jubair and colleagues [6] and Tornos and co-workers [19], we did not find this result in our data.
In conclusion, in active NVE operative mortality is now less than 10%. Increased age, insidious illness, and severe hemodynamic failure are the main risk factors. Long-term survival is good, except for patients who had preoperative brain complications and mitral valve endocarditis.
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| Appendix 1. List of the Variables |
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| Footnotes |
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| References |
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