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Bacterial endocarditis. Echocardiographic and clinical evaluation during therapy.

In two patients with bacterial endocarditis and apparent vegetations, the echocardiographic findings included thickening but normal excursion of the mitral leaflet and abnormal shaggy echoes superimposed on the mitral leaflet echogram. Both patients had had endocarditis several weeks before the study was performed. In both patients the abnormal echoes disappeared after antibiotic therapy. Whether or not the echocardiographic findings are specific to bacterial endocarditis must be determined by further studies. One patient had evidence of "immune complex disease" with vasculitis, hypocomplementemia, and renal failure which persisted for weeks after disappearance of vegetations on the echocardiogram. This sequence was unexpected, as a continued source of antigen for this reaction was not apparent.

Adult↗

Aspergillus endocarditis, myocarditis and pericarditis complicating necrotizing fasciitis. Case report and subject review.

A patient with Aspergillus endocarditis, myocarditis and pericarditis is described. A 55-year-old man developed necrotizing fasciitis of the lower abdominal wall, pelvis and right thigh. Despite aggressive surgical débridement and antibiotic coverage, the patient died of multisystem organ failure. Autopsy revealed Aspergillus thromboulcerative endocarditis, myocarditis and pericarditis, acute necrotizing fungal bronchopneumonia and mycotic dissemination to brain, kidney and thyroid gland. A review of the literature showed that in the absence of open-heart surgery Aspergillus endocarditis and myocarditis are very uncommon.

Aspergillosis↗

Secondary amyloidosis from long-standing bacterial endocarditis.

Survival of patients with increasingly complex congenital heart disease has produced a population of children and adolescents who are susceptible to subacute bacterial endocarditis (SBE). We report a child whose endocarditis went unrecognised, and who developed amyloidosis. Asymptomatic proteinuria, haematuria and renal impairment are occasionally seen in SBE and usually indicate glomerulonephritis. Amyloidosis should also be suspected in children with long-standing bacterial endocarditis with proteinuria or other evidence of renal impairment, especially if associated with organomegaly. The diagnosis is made by renal biopsy.

Amyloidosis↗

The role of bacterial adherence in the pathogenesis of infective endocarditis.

Bacterial adherence as a result of specific surface properties may be a contributory factor in the pathogenesis of bacterial endocarditis giving certain types of bacteria a selective advantage to cause this disease. Adherence could interact with other pathogenetic mechanisms, and this interaction could promote or hamper the development of endocarditis. Dextran production by streptococci, the activation of the clotting system by monocyte tissue thromboplastin, and phagocytic removal of bacteria from the vegetational surface by granulocytes and monocytes are examples of interacting mechanisms that could contribute to the pathogenesis of bacterial endocarditis.

Adhesiveness↗

Infective endocarditis of the pulmonary valve following pulmonary artery catheterisation.

The risk of infective endocarditis following pulmonary artery catheterisation in patients with sepsis remains unquantified. Although catheter-induced endocardial and valvular injury are well recognised, valve infection is rare. A case of mixed pulmonary valve endocarditis associated with the use of a pulmonary artery catheter (PAC) in a patient with multisystem failure following liver trauma is described. This illustrates that diagnosis of infective endocarditis in critically ill patients can be difficult because concurrent illness and therapy may mimic or mask the usual presenting signs. The value of transoesophageal echocardiography in this context is emphasised.

Adult↗

Swan-Ganz catheter-related pulmonary valve infective endocarditis: a case report.

We report the case of a 29-year-old man with decompensated alcoholic cardiomyopathy who developed a Staphylococcal pulmonic valve infective endocarditis during hemodynamic monitoring, as a consequence of catheter-related bacteremia. As experimentally demonstrated, the damaging role of the pulmonary artery catheter on the endocardial surface plays a major role in the pathogenesis of related right-sided infective endocarditis. Occurrence of bacteremia in a catheterized patient should be considered as a high risk situation, and righ-heart infective endocarditis must be suspected whenever patient presents fever or bacteremia without obvious site of infection. Doppler echocardiography is the reference diagnosis procedure.

Adult↗

Infective endocarditis due to Stenotrophomonas (Xanthomonas) maltophilia.

Stenotrophomonas maltophilia (formerly Xanthomonas maltophilia) is a gram-negative bacillus increasingly associated with serious nosocomial infections. Here, the case of a 69-year-old female patient who developed prosthetic valve endocarditis associated with this organism is described. A review of the literature revealed only 18 previous reports; eight involved native valves, the remainder prosthetic valves. Most cases were associated with risk factors, including intravenous drug abuse (6 patients), infected intravenous lines (4 patients) or a recent invasive procedure (3 patients). The course of the disease appears to be indolent, but is otherwise similar to infective endocarditis associated with other gram-negative organisms. Antimicrobial therapy is complicated by multiple drug resistance of the organism; cotrimoxazole may be beneficial, if the isolate is susceptible, in combination with another agent. Five of nine (55%) patients who underwent valve replacement survived, as compared to three of seven (43%) who received antibiotic therapy only. Hence, surgery is not essential for survival in every case and depends as much on the individual patient's course as on established criteria for valve replacement in prosthetic valve endocarditis.

Anti-Bacterial Agents↗

Acinetobacter endocarditis in children: a case report and review of the literature.

Acinetobacter calcoaceticus, a gram-negative bacterium ubiquitous in soil, water and sewage, is a rare cause of endocarditis in children. The first case of Acinetobacter endocarditis in an infant is described. This patient had underlying tetralogy of Fallot with absent pulmonary valve. A review of the literature in English revealed only four other cases of Acinetobacter endocarditis in children; three of whom had underlying congenital heart disease. Like the other reported cases, this patient responded well to antibiotic treatment. Subsequently this patient underwent corrective cardiac surgery but died of post-operative complications.

Acinetobacter Infections↗

Fungal endocarditis--a report on seven cases and a brief review.

Candida endocarditis is an unusual but severe complication of systemic infection caused by Candida albicans and occasionally by other fungal species. We describe seven cases that occurred during a period of 20 years in western Sweden. In four cases infections were located on prosthetic valves and in three cases native valves were involved. Three patients died of the disease in the acute phase. A definite diagnosis was established in one of four survivors. This patient had an aortic valve endocarditis and a saddle embolisation and was treated with immediate surgery, followed by intensive treatment with liposomal amphotericin B+ flucytosine. Fungal endocarditis is still a serious disease with a high mortality and whenever the diagnosis is suspected, antifungal therapy must be started and transesophageal sonography should be performed to visualize vegetations. Immediate surgery should be considered.

Adult↗

Septicemia and endocarditis caused by group G streptococci in a Norwegian hospital.

The clinical and bacteriological features of septicemia caused by group G streptococci were analyzed in nine patients seen during a period of 28 months. Four of these patients had acute endocarditis with a high rate of serious neurological complications. The clinical response to antibiotic treatment was slow in the endocarditis patients despite sensitivity of the organism in vitro. Group G streptococcal septicemia can be a very serious condition associated with endocarditis of a destructive nature. Comparison with previous reports suggests that group G streptococcal infections are of increasing importance. The virulence of group G streptococci may be changing, resulting in more serious infections and complications. This series stresses the importance of prompt recognition of this infection and the need for aggressive management of these patients.

Acute Disease↗

Distribution, antibiotic susceptibility and tolerance of bacterial isolates in culture-positive cases of endocarditis in The Netherlands.

During a two-year period data were collected nationwide in The Netherlands on 438 episodes of bacterial endocarditis (BE) in 432 patients. Of the strains isolated in these patients 419 were available for analysis. Of these, 326 were isolated in native valve endocarditis (NVE) and 93 in prosthetic valve endocarditis (PVE). Viridans streptococci, staphylococci and enterococci together constituted 87% of the isolates. More than 46% of the viridans streptococci consisted of Streptococcus sanguis. Enterococcus faecalis and Staphylococcus aureus were the predominant species in the late form of PVE. The majority of the viridans streptococci and haemolytic streptococci were highly susceptible to penicillin. Five of 35 strains of coagulase negative staphylococci were resistant to methicillin. Eleven percent of a random sample of the streptococci collected were tolerant to penicillin. After repeated exposure to a concentration gradient of an appropriate beta-lactam antibiotic, this figure increased to 49%. Of the staphylococci, 5-6% of the strains were tolerant before induction and 16-20% after induction. Of the Enterococcus strains (n = 40), 12.5% showed high-level resistance to one or more aminoglycoside.

Drug Resistance, Microbial↗

Value of the serum bactericidal test in management of patients with bacterial endocarditis.

A review is given of the available clinical data on the prognostic value of the serum bactericidal test in the treatment of patients with bacterial endocarditis. It is concluded that the test, even when performed in a standardized manner, does not provide useful information for the majority of patients with bacterial endocarditis. Until further clinical data are available, routine performance of the test in patients with bacterial endocarditis is not recommended.

Anti-Bacterial Agents↗

Diagnostic and therapeutic implications of transesophageal echocardiography in medical ICU patients with unexplained shock, hypoxemia, or suspected endocarditis.

OBJECTIVE: To evaluate the diagnostic and therapeutic implications of transesophageal echocardiography (TEE) in intensive care patients. DESIGN: Comparative study. SETTING: A 10-bed general intensive care unit. PATIENTS: Between 1 January 1992 and 31 May 1993, 61 patients prospectively identified with shock (n = 14), severe, unexplained hypoxemia (Partial pressure of oxygen in arterial blood/fractional inspired oxygen < 200) (n = 31), or suspected endocarditis (n = 16) underwent a TEE examination to supplement transthoracic echocardiography (TTE) examination. INTERVENTIONS: The results of each TEE examination were compared with the clinical findings and TTE data. TEE examinations were classified as follows: 0, TEE results were similar to TTE results; 00, TEE examination resulted in exclusion of suspected abnormalities; 1, TEE revealed a new but minor diagnosis compared to the TTE diagnosis; 2, TEE revealed a new major diagnosis not requiring a change of treatment; 3, TEE results revealed a new major diagnosis requiring an immediate change of treatment. RESULTS: Intraobserver reliability of the TEE classification was confirmed by a 100% concordance and interobserver reliability was evaluated as an 84% concordance. Results of the TEE classification were: class 0, n = 21 (34%); class 00, n = 13 (21%); class 1, n = 7 (12%); class 2, n = 8 (13%); class 3, n = 12 (20%). Therapeutic implications of TEE in class 3 patients were cardiac surgery in 5 patients (2 cases of acute mitral regurgitation, 2 valvular abscesses, and 1 hematoma compressing the left atrium), discontinuation of positive end-expiratory pressure in 1 ventilated patient with an atrial septal defect, weaning off mechanical ventilation in 1 patient with an atrial septal defect, prescription of antimicrobial therapy in 3 patients with endocarditis, and prescription of anticoagulant therapy in 2 patients with left atrial thrombus. No difficulty inserting the transducer was observed in any of the 61 patients studied. The only noteworthy complication was a case of spontaneously resolving atrial fibrillation. CONCLUSION: TEE is safe and well tolerated and is useful in the management of patients in the intensive care unit with shock, unexplained and severe hypoxemia, or suspected endocarditis when TTE is inconclusive.

Aged↗

Infective endocarditis in childhood.

A total of 37 cases of infective endocarditis, in children aged two days to 13 years, were seen from 1971 to 1983 at the Children's Hospital, Camperdown. Structural heart disease was known to preexist in 95%. Cyanotic congenital heart disease was present in 15 children, of whom 11 had been palliated by a systemic-to-pulmonary artery shunt. In five children, there was infection of a prosthetic valve. Identifiable precipitants of infection were rare. In particular, no child had had a preceding dental procedure within three months, while only 19% had had recent cardiac surgery. Organisms were identified by blood culture in 92%, the majority being streptococci (43% of cases) and staphylococci (27% of cases). While 59% of all organisms were penicillin sensitive, six of the seven early postoperative children were infected with organisms not sensitive to antibiotics, given for wound infection prophylaxis in the perioperative period. The overall death rate was 13.5%. Of the children infected with Staphylococcus aureus, 40% died, while no child with Streptococcus viridans endocarditis died. Of the survivors, four needed urgent valve replacement, and three had major central nervous system complications. Using these figures, a current profile of patients with infective endocarditis is presented.

Adolescent↗

Surgery for tricuspid valve endocarditis: a selective approach.

The authors report their 18-year experience in the surgical treatment of infective tricuspid endocarditis. Between January 1981 and January 1999, 238 cases of infective endocarditis were seen. with a tricuspid involvement in 21 cases (8.8%). Tricuspid valve repair was performed in 9 patients with infective lesions involving one single leaflet. The surgical principle of the repair was to avoid any prosthetic material implantation. Posterior leaflet vegetectomy was performed in another 2 patients with infected intracavitary leads. Tricuspid valve replacement was performed in 10 patients with involvement of the whole valvular apparatus. One patient died of septic shock 3 days postoperatively. All the other patients had a good postoperative recovery. Follow-up ranged between 12 and 155 months (mean 68.9 +/- 55 months). Five cases of late mortality were observed: 3 for cardiac reasons and 2 of cancer. All the other patients are alive. Late postoperative echocardiography in the patients with tricuspid repair showed tricuspid regurgitation to be absent in 6 patients, mild in 2, moderate in 1, and severe in 1. No recurrent infections were observed either in patients with valve repair or in those with valve replacement. Good early and long-term results can be achieved in the surgical treatment of tricuspid endocarditis as long as complete excision of the infected tissue is performed and risk factors are controlled.

Adult↗

Aortic root replacement using a homograft for recurrent valve endocarditis.

Prosthetic valve endocarditis is a relatively rare condition associated with high mortality. Endocarditis affecting 2 successive mechanical valves at the aortic position has not, to the best of our knowledge, been described. We reported such a patient whose condition was further complicated by mitral regurgitation, pulmonary hypertension, worsening heart failure, and cardiac conduction abnormalities. Considering the failure of 2 previous mechanical valves, we conducted a homograft replacement of the aortic root with coronary reattachment. Mitral regurgitation was treated by annuloplasty. The patient's early postoperative course was uneventful and he was doing well 16 months after surgery. We discuss the overall treatment strategy for recurrent prosthetic valve endocarditis and potential homograft advantages.

Adult↗

Splenic abscess associated with active infective endocarditis.

Splenic abscess is a rare complication in infective endocarditis. Here, we present two cases of splenic abscess associated with active infective endocarditis. Body computed tomography before emergency valvular surgery revealed abscess in the spleen. In case 1, the abscess was localized within the spleen; splenectomy and valve replacement were performed through the same median skin incision. In case 2, the splenic abscess was diagnosed as ruptured; valve replacement was performed, followed by splenectomy through a separate skin incision. No recurrence of infection occurred after surgery in either case. In surgical treatment for active infective endocarditis, body computed tomography is essential to diagnose splenic abscess preoperatively. If there is an abscess, then splenectomy and valvular surgery should be performed simultaneously to prevent reinfection after valvular surgery. The approach to the spleen should be individualized according to the extension of the abscess.

Abscess↗

Successful surgical management of patients with infective endocarditis associated with acute neurologic deficits.

Subjects were 2 patients with neurologic deficits due to infective endocarditis. The first, a 30-year-old woman with acute ischemic stroke, was found to have vegetation from infective endocarditis as the embolic source. Two weeks after she experienced an acute ischemic stroke, we conducted elective cardiac surgery. The second, a 16-year-old girl with infective endocarditis, suffered a ruptured mycotic aneurysm in the left carotid system complicated by intracranial hemorrhage. We conducted a successful staged mitral valve replacement following craniotomy.

Adolescent↗