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Posts Tagged ‘Infective endocarditis’


Treatment for Infective Endocarditis

Curator: Larry H Bernstein, MD, FACP

UPDATED on 3/4/2019

WATCH VIDEO

https://consultqd.clevelandclinic.org/tricuspid-valve-reconstruction-for-infective-endocarditis-operative-highlights-video/amp/?__twitter_impression=true

Tricuspid Valve Reconstruction for Infective Endocarditis: Operative Highlights (Video)

There are no easy solutions for acute infective tricuspid valve endocarditis in IV drug users, as the risk of prosthetic endocarditis in this population is high. Complete valve resection without replacement is feasible but leads to progressive right-sided heart failure. Reconstruction of the tricuspid valve with autologous pericardium is an alternative option, as demonstrated in the video case study below.

A 29-year-old female drug abuser with fever, hemoptysis and MRSA bacteremia was started on IV antibiotics. She looked frail and had prominent jugular venous pressure as well as 95 percent saturation on 2 liters of nasal cannula oxygen. She was not on inotropes and had a pulmonary artery pressure of 40/20 mmHg with a good cardiac index. Chest CT showed a large left pleural effusion with associated atelectasis of the left lung. The right lung had manifestations of septic emboli and a smaller pleural effusion.

A Cleveland Clinic surgical team led by cardiothoracic surgeon Faisal Bakaeen, MD, proceeded to excise the patient’s extensive infected and devitalized tissue around the tricuspid valve, leaving only a portion of the anterior leaflet to serve as a reference for reconstruction using autologous pericardium. Dr. Bakaeen walks us through the essential surgical steps — and their underlying rationale — in the narrated operative video below.

SOURCE

https://consultqd.clevelandclinic.org/tricuspid-valve-reconstruction-for-infective-endocarditis-operative-highlights-video/amp/?__twitter_impression=true

 

An article that appeared in NEJM compares early surgery versus conventional treatment for infective endocarditis.
Early Surgery versus Conventional Treatment for Infective Endocarditis
Duk-Hyun Kang, Yong-Jin Kim, Sung-Han Kim, Byung Joo Sun, et al.

N Engl J Med June 28, 2012; 366:2466-2473. http://doi.org/10.1056/NEJMoa1112843

Background and Purpose: While current guidelines advocate surgical management for complicated left-sided infective endocarditis and early surgery for patients with infective endocarditis and congestive heart failure, the indications for surgical intervention to prevent systemic embolism remain unclear. Surgery is favored by experience with complete excision of infected tissue and valve repair, and low operative mortality, but it does not remove concerns about residual active infection, which results in two sets of guidelines, the 2006 ACC-AHA for class IIa indication only for recurrent emboli and persistent vegetation, and the 2009 ESC guidelines for class IIb indication for very large, isolated vegetations. The Early Surgery versus Conventional Treatment in Infective Endocarditis (EASE) trial was conducted to determine whether early surgical intervention woulddecrease rate of death or embolic events.

Patient Enrollment: The study enrolled 76 consecutive patients, 18 years of age or older, with left-sided, native-valve infective endocarditis and a high risk of embolism. For all patients with suspected infective endocarditis, blood cultures were obtained and transthoracic echocardiography was performed within 24 hours after hospitalization. Patients were only eligible for enrollment if they had received a diagnosis of definite infective endocarditis and had severe mitral valve or aortic valve disease and vegetation with a diameter greater than 10 mm. Patients were excluded if they had moderate-to-severe congestive heart failure, infective endocarditis complicated by heart block, annular or aortic abscess, destructive penetrating lesions requiring urgent surgery, or fungal endocarditis, or were over 80 years age, or coexisting major embolic stroke with a risk of hemorrhagic transformation at the time of diagnosis, and a serious coexisting condition. Patients were also excluded if they had infective endocarditis involving a prosthetic valve, right-sided vegetations, or small vegetations (diameter, ≤10 mm) or had been referred from another hospital more than 7 days after the diagnosis of infective endocarditis.
The protocol specified that patients who were assigned to the early-surgery group should undergo surgery within 48 hours after randomization. Patients assigned to the conventional-treatment group were treated according to the AHA guidelines, and surgery was performed only if complications requiring urgent surgery developed during medical treatment or if symptoms persisted after the completion of antibiotic therapy. Details of the study procedures are provided in the Supplementary Appendix, available at NEJM.org.

Study End Points: The primary end point was a composite of in-hospital death or clinical embolic events that occurred within 6 weeks after randomization. An embolic event was defined as a systemic embolism fulfilling both prespecified criteria: the acute onset of clinical symptoms or signs of embolism and the occurrence of new lesions, as confirmed by follow-up imaging studies. Prespecified secondary end points, at 6 months of follow-up, included death from any cause, embolic events, recurrence of infective endocarditis, and repeat hospitalization due to the development of congestive heart failure.

Clinical and Echocardiographic Characteristics of the Patients at Baseline, According to Treatment Group:

The mean age of the patients was 47 years, and 67% were men. The mitral valve was involved in 45 patients, the aortic valve in 22, and both valves in 9. Severe mitral regurgitation was observed in 45 patients, severe aortic regurgitation in 23, severe aortic stenosis in 3, severe mitral regurgitation and stenosis in 1, and both severe mitral regurgitation and aortic regurgitation in 4. The median diameter of vegetation was 12 mm (interquartile range, 11 to 17). All patients met the Duke criteria for definite endocarditis; the most common pathogens in both groups were viridans streptococci (in 30% of all patients), other streptococci (in 30%), and Staphylococcus aureus (in 11%). Characteristics of Antibiotic Therapy, According to Treatment Group: There were no significant between-group differences in terms of control of the underlying infection, the antibiotic regimen used, or the duration of antibiotic therapy.

Surgical Procedures: All patients in the early-surgery group underwent valve surgery within 48 hours after randomization; the median time between randomization and surgery was 24 hours (interquartile range, 7 to 45). Of the 22 patients with involvement of the mitral valve, 8 patients underwent mitral-valve repair and 14 underwent mitral-valve replacement with a mechanical valve. Of the 15 patients with involvement of the aortic valve or both the mitral and aortic valves, 14 underwent mechanical-valve replacement and 1 underwent valve replacement with a biologic prosthesis. Concomitant coronary-artery bypass grafting at the time of valve surgery was performed in 2 patients (5%).

Conventional Therapy: Of the 39 patients assigned to the conventional-treatment group, 30 (77%) underwent surgery during the initial hospitalization (27 patients) or during follow-up (3). The surgical procedures included 11 mitral-valve repairs, 6 mitral-valve replacements (with 5 patients receiving a mechanical valve and 1 a biologic prosthesis), 11 aortic-valve replacements (with 9 patients receiving a mechanical valve and 2 a biologic prosthesis), and 2 combined aortic-valve replacements (with 1 patient receiving a mechanical valve and 1 a biologic prosthesis) and mitral-valve repairs. In 8 patients (21%), indications for urgent surgery developed during hospitalization (median time to surgery after randomization, 6.5 days [interquartile range, 6 to 10]). Elective surgery was performed in an additional 22 patients owing to symptoms or left ventricular dysfunction more than 2 weeks after randomization. Surgical results are shown in the Supplementary Appendix.

Primary End Point: The primary end point of in-hospital death or embolic events within the first 6 weeks after randomization occurred in one patient (3%) in the early-surgery group, as compared with nine (23%) in the conventional-treatment group (hazard ratio, 0.10; 95% confidence interval [CI], 0.01 to 0.82; P=0.03). In the early-surgery group, one patient died in the hospital and no patients had embolic events; in the conventional-treatment group, one patient died in the hospital and eight patients had embolic events (Table 3TABLE 3).
http://www.nejm.org/na101/home/literatum/publisher/mms/journals/content/nejm/2012/nejm_2012.366.issue-26/nejmoa1112843/production/images/small/nejmoa1112843_t3.gif

At 6 weeks after randomization, the rate of embolism was 0% in the early-surgery group, as compared with 21% in the conventional-treatment group (P=0.005). No patient in either group had an embolic event or was hospitalized for congestive heart failure during follow-up. Recurrence of infective endocarditis within 6 months after discharge was not observed in any patient in the early-surgery group but was reported in 1 patient in the conventional-treatment group. Among the 11 patients (28%) in the conventional-treatment group who were treated medically and discharged without undergoing surgery, 1 (3%) died suddenly, 7 (18%) had symptoms related to severe valve disease or recurrence of infective endocarditis (3 of whom underwent surgery during follow-up), and 3 (8%) had no symptoms or embolic events (Table S3 in the Supplementary Appendix).
There was no significant difference between the early-surgery and conventional-treatment groups in all-cause mortality at 6 months (3% and 5%, respectively; hazard ratio, 0.51; 95% CI, 0.05 to 5.66; P=0.59) (Figure 2AFIGURE 2).
http://www.nejm.org/na101/home/literatum/publisher/mms/journals/content/nejm/2012/nejm_2012.366.issue-26/nejmoa1112843/production/images/small/nejmoa1112843_f2.gif
Kaplan–Meier Curves for the Cumulative Probabilities of Death and of the Composite End Point at 6 Months, According to Treatment Group.

At 6 months, the rate of the composite of death from any cause, embolic events, recurrence of infective endocarditis, or repeat hospitalization due to the development of congestive heart failure was 3% in the early-surgery group, as compared with 28% in the conventional-treatment group (hazard ratio, 0.08; 95% CI, 0.01 to 0.65; P=0.02). The estimated actuarial rate of end points was significantly lower in the early-surgery group than in the conventional-treatment group (P=0.009 by the log-rank test) (Figure 2B).

Conclusion: Early surgery performed within 48 hours after diagnosis reduced the composite primary end point of death from any cause or embolic events by effectively reducing the risk of systemic embolism. Moreover, these improvements in clinical outcomes were achieved without an increase in operative mortality or recurrence of infective endocarditis.

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Early Surgery May Benefit Some With Heart Infection

Reporter: Aviva Lev-Ari, RN

 

Early Surgery May Benefit Some With Heart Infection, but doctors say findings only apply to a certain few

June 27, 2012 

By Denise Mann
HealthDay Reporter

http://health.usnews.com/health-news/news/articles/2012/06/27/early-surgery-may-benefit-some-with-heart-infection?page=2

WEDNESDAY, June 27 (HealthDay News) — People with an advanced form of a heart infection called endocarditis may do better if they undergo early surgery than if they are treated with antibiotics initially, a new study suggests.

Infective or bacterial endocarditis occurs when bacteria settles in the heart lining or heart valve. In advanced cases, the abnormal bacterial growth, often called vegetation, can be large enough to break off and travel elsewhere in the body, such as to the brain, where it may cause a stroke. Advanced infective endocarditis can also damage the heart valve.

People with existing heart disease or heart-valve problems are most likely to develop endocarditis.

In a new study published June 28 in the New England Journal of Medicine, researchers evaluated close to 80 people, average age 47, with advanced infective endocarditis.

Of these, 37 had early surgery within 48 hours of their diagnosis, and 39 received conventional therapy with antibiotics while they were monitored to see if the infection abated. Thirty people placed in the conventional treatment group eventually had surgery.

Early surgery reduced the risk of developing an embolism (or clot) and did not increase the risk of in-hospital death, the study showed.

After six months, the rate of adverse events, including death, repeat hospitalization for congestive heart failure or a recurrence of endocarditis, was 3 percent in the early-surgery group versus 28 percent in the conventionally treated patients.

“Early surgery can be the preferred option to further improve clinical outcomes of infective endocarditis, which is associated with considerable morbidity and mortality,” said study author Dr. Duk-Hyun Kang, a cardiologist at University of Ulsan College of Medicine in Seoul, South Korea.

“If a patient with infective endocarditis has large vegetations and severe valve disease, we would advise them to request early referral to medical centers with adequate experience and resources for early surgery,” Kang said.

Surgery for infective endocarditis aims to remove all infected tissue, repair the heart tissue and repair or replace the affected valve.

Others experts said only certain patients would warrant early surgery.

The new study “showed that patients with the combination of large vegetations and valve dysfunction, even if they are stable and not in heart failure, have a high risk of suffering serious embolic events or to progress to heart failure with need for emergency surgery and that early surgery prevented these complications,” said Dr. Gosta Pettersson, co-author of an accompanying journal editorial and vice chair of thoracic and cardiovascular surgery at the Cleveland Clinic in Ohio.

Surgery does have its share of risks, however. “Historically, surgery for infective endocarditis was high-risk surgery, and the risk of recurrent infection on the replacement valve was also high,” he said.

“Today, several publications have demonstrated that the added risk of operating on a patient with active infection has been more or less neutralized,” Pettersson added.

Surgeons have become adept at removing all infected tissue and foreign material and determining how best to reconstruct the heart, he explained. “Taking care of this patient is a team work with close collaboration between infectious disease specialists, cardiologists and cardiac surgeons,” he said. Importantly, he noted, “surgery is a complement to antibiotics not an alternative.”

Not everyone with infective endocarditis should have surgery, Pettersson said. For example, the stable patient with small vegetations, preserved valve function and growth of bacteria sensitive to antibiotics does not need surgery. Severely ill patients who are unlikely to survive an operation or those who have irreversible brain damage from embolism would not be surgical candidates either, he pointed out.

Dr. Stephen Green, chief of cardiology at North Shore University Hospital in Manhasset, N.Y., said that the new findings only apply to a select few. “Patients in the study had very large vegetation and severe valve pathology,” Green said. “These tend to be the worst of the worst.”

Most people with infective endocarditis are treated with antibiotics. “We reserve surgery for people whose infections don’t resolve, have fever or bacteria in the bloodstream or whose valves get destroyed,” Green noted.

“Many people with milder forms can be treated with antibiotics and monitored long term to see if they need surgery,” he added. This study suggests that “if you get a really bad clump of stuff on a valve, even if it’s antibiotic-sensitive, maybe we should go to surgery earlier.”

More information

Learn more about infective endocarditis at the American Heart Association.

Copyright © 2012 HealthDay. All rights reserved.

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