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Infectious Disease – Infective Endocarditis
ENDOCARDITIS (VALVE PROSTHETIC)
ESSENTIALS DESCRIPTION
An infection of prosthetic heart valves or prosthetic material by bacteria, fungus, or infrequently chlamydiae or rickettsiae is known as prosthetic valve endocarditis.
The incidence of epidemiology
Prosthetic valve infective endocarditis (PVIE) affects between 0.3 and 1% of patients annually.
RISK ELEMENTS
• Healthcare-associated infections are the most significant risk factors for the development of prosthetic valve infection.
• Hemodialysis and long-term intravascular access are additional risk factors.
OVERALL PREVENTION
• Patients with the following conditions are advised to avoid endocarditis by taking antibiotics (2):
A prosthetic heart valve or material for valve repair; prior endocarditis
Congenital heart disease (repaired CHD with a persisting defect, unrepaired cyanotic CHD)
Cardiac valvulopathy in recipients of heart transplants
• Prophylaxis is advised for dental operations that include gingival manipulation and disruption of the oral mucosa.
• Patients with the high-risk disorders mentioned above who have procedures involving the respiratory system, soft tissues of the skin, or muscles should also consider prophylaxis. It is not advised to use antibiotics during GI or GU procedures in order to prevent IE.
• Among the antibiotic regimens are a single dosage of either 600 mg of clindamycin or 2 g of amoxicillin 30 to 60 minutes before the surgery.
Pathophysiology
Prosthetic valve endocarditis may arise as a result of contiguous infection spread, secondary infection by hematogenous dissemination, or contamination of the device during implantation.
ETIOLOGY • The most frequent cause of prosthetic valve infection is Staphylococci.
• There are two types of prosthetic valve IE: early-onset, which happens within 60 days of surgery, and late-onset, which happens later.
• While late-onset PVIE is brought on by pathogens that are similar to native valve IE, early-onset PVIE is frequently caused by hospital-acquired pathogens.
• Staphylococcus aureus (20–35%), including MRSA, coagulase negative staphylococcus (17–30%), Streptococcus spp. (1–4%), Enterococcus spp. (5–10%), fungal (5–10%), gram-negative bacilli (6–15%), or culture-negative IE (3–17%) are the most common microbiologic etiologies for early onset IE.
S. aureus (15–20%), coagulase negative staphylococcus (10–20%), Streptococcus spp. (20–30%), Enterococcus spp. (8–13%), fungal (1–3%), gram-negative bacilli (4–7%), or culture-negative (3–12%) IE are the most prevalent microbiologic causes of late onset IE.
• Antibiotics taken within the previous seven days, slow-growing, picky anaerobes, fungi (non-Candida species), Bartonella spp., Coxiella burnetii (Q fever), Legionella spp., Tropheryma whippelii, Chlamydia spp., or Brucella spp. are some of the potential causes of culture-negative endocarditis.
History of Diagnosis
• PVIE's clinical characteristics vary greatly. It might manifest as an acute, toxic illness with high fevers or as a chronic, indolent illness.
• A comprehensive workup for endocarditis is necessary in individuals with prosthetic valves and an inexplicable fever.
• More than 70% of people with PVIE have a fever. Weakness, chills, sweats, anorexia, weight loss, nausea, and malaise are examples of nonspecific symptoms.
• Get a thorough medical history that includes recent travel, exposure to animals, and dietary practices such eating unpasteurized dairy products.
• One popular set of diagnostic criteria for Internet Explorer is the modified Duke criteria. To determine if endocarditis is definite or conceivable, or to rule out the diagnosis completely, they integrate clinical characteristics, microbiologic data, echocardiography, and pathologic data. (Taken from Li and others).
• The primary criterion is microbiological (1) Two sets of blood cultures tested positive for common pathogens, such as Streptococcus bovis, Viridans streptococci, HACEK group, and S.
aureus; or enterococci from the population that don't have a primary focus; or (2) IE-consistent microorganisms from blood cultures that consistently test positive; or (3) a single positive blood culture for Coxiella burnetii or anti-phase 1 IgG antibody titer more than 1:800
Evidence of involvement of the endocardium (1) Positive echocardiography (new partial dehiscence of prosthetic valve, abscess, or oscillating intracardiac mass on valve) (2) New valvular regurgitation (inadequate preexisting murmur or worsening or altering)
• Minor criteria: IDU, predisposing cardiac disease, or predisposition A fever
Vascular manifestations include Janeway's lesions, mycotic aneurysms, septic pulmonary infarcts, cerebral hemorrhages, conjunctival hemorrhages, and major arterial emboli.
Immunologic phenomena include rheumatoid factor, Osler's nodes, Roth's spots, and glomerulonephritis.
Microbiological evidence: Serological evidence of a current infection with an organism consistent with IE or a positive blood culture that does not satisfy one of the key criteria mentioned above
• Two main criteria, one major criterion plus three minor criteria, or five minor criteria are the clinical criteria for definitive endocarditis.
• The pathologic criteria for definitive endocarditis:
microorganisms detected by pathologic or cultural analysis of vegetation, embolized vegetation, or intracardiac abscess; or histological analysis of vegetation or intracardiac abscess exhibiting active endocarditis.
• One main criterion plus one minor criterion, or three minor criteria, may indicate endocarditis.
• Rejected: Does not fulfill clinical criteria for probable IE; has no pathologic evidence of IE at surgery with less than 4 days of antibiotics; has a firm alternative diagnosis; and resolves symptoms in less than 4 days.
MEDICAL EXAMINATION
• A new or altered murmur or signs of congestive heart failure may be found during the cardiac examination.
• A comprehensive examination should be performed to detect embolic events (stroke) or other infection sites (epidural abscess, psoas abscess, septic arthritis).
Tests for Diagnosis and Interpretation Lab
First laboratory testing
• Complete blood count with differential, electrolytes, blood urea nitrogen, creatinine, liver function tests, several sets of blood cultures, urinalysis, and ESR are all part of the initial laboratory examination for suspected IE.
• Get at least three sets of blood cultures within the first twenty-four hours. To increase the likelihood of detecting the causing bacterium, draw multiple sets of blood cultures prior to giving antibiotics. Up to 90% of patients had positive results from the first two sets.
• Elevations of serum inflammatory markers (CRP, ESR) and leukocytosis are frequent.
Follow-up and Particular Points to Remember
• Serologic testing for uncommon pathogens including Q fever and Bartonella spp. may be necessary in cases of culture-negative endocarditis.
• Until the endovascular infection has resolved, obtain two sets of blood cultures every 24 to 48 hours.
Imaging First Step
• The preferred imaging procedure is transesophageal echocardiography (TEE). Because of the high incidence of paravalvular problems and artifact from mechanical prosthesis, TEE is recommended over transthoracic echocardiography.
and a tiny amount of greenery. TEE can identify vegetation with a sensitivity of 86–94% and a specificity of 91–100%.
• When prosthetic valve IE is suspected, a TEE should be conducted as soon as feasible.
Follow-up and Particular Points to Remember
If there is a suspicion of emboli, abscesses, or mycotic aneurysm, further imaging of the brain, spine, abdomen, or lungs is necessary.
Diagnostic Techniques and Other
To determine a baseline heart rhythm and detect any conduction diseases, have an EKG. Bradycardia, syncope, presyncope, or a change in clinical state all call for a repeat EKG.
Pathological Results
• According to histopathologic analysis, vegetations are made up of bacterial or fungal masses, fibrin, and platelet aggregates.
• Some laboratories offer PCR-based assays on blood or valvular tissue for hard-to-culture organisms including T. whippleii and Bartonella spp., which may be indicated in certain cases of culture negative results.
endocarditis.
DISTINCTIVE DIAGNOSIS
Other systemic illnesses including malaria, bacteriemia, or fungemia without IE, as well as noninfectious endocarditis.
MEDICATION FOR TREATMENT
• To break through the vegetation and stop recurrence, prolonged antibacterial treatment is necessary. It is critical to identify the causal organism and medication susceptibilities.
• The severity of the illness, local resistance patterns, and patient risk factors for different pathogens are the foundations of empirical therapy.
• The following is a list of suggested treatment plans for specific pathogens (1).
• Penicillin G 24 million U/24 h (given continuously or in 4–6 doses) • Penicillin susceptible Viridans streptococci, S. bovis, or other streptococci (minimum inhibitory concentration ≤0.12 μg/mL) or, if PCN and ceftriaxone are intolerant or allergic, ceftriaxone 2g IV daily for 6 weeks + gentamicin 3 mg/kg/d in a single dosage for 2 weeks – Vancomycin 30 mg/kg/d in 2 divided doses for 6 weeks
MIC >0.12 μg/mL or ≤0.5 μg/mL for streptococci that are highly resistant to penicillin; Penicillin G 24 million U/24 h (dosed continuously or
Vancomycin 30 mg/kg/d in 2 divided doses plus gentamicin 3 mg/kg/d in 3 divided doses for 6 weeks if ampicillin allergy; or ceftriaxone 2g IV daily plus gentamicin 3 mg/kg/d in 1 dose for 6 weeks; Streptococci resistant to penicillin (MIC >0.5 μg/mL) and enterococci – Ampicillin 12 g/d in 6 divided doses plus gentamicin 3 mg/kg/d in 3 divided doses for 6 weeks
Methicillin-resistant staphylococci: Vancomycin 30 mg/kg/d in 2 divided doses plus rifampin 900 mg/d in 3 divided doses for ≥6 weeks plus gentamicin 3 mg/kg/d in 2 or 3 divided doses for 2 weeks; Methicillin-susceptible staphylococci: Nafcillin 12 g/d IV in 6 divided doses plus rifampin 900 mg/d in 3 divided doses for ≥6 weeks plus gentamicin 3 mg/kg/d in 2 or 3 divided doses for 2 weeks; The doses above are based on normal renal function.
ADDITIONAL MEDICATION
Overall Actions
When clinically stable, refer IDU patients to drug treatment programs.
Referral Issues
Infectious endocarditis of the prosthetic valve and its aftereffects can be fatal, and complicated management problems are frequent. It is crucial to have a multidisciplinary strategy that incorporates input from infectious diseases, cardiology, and cardiovascular surgery.
OTHER PROCEDURES AND SURGERY
• Patients with endocarditis from prosthetic valves should be assessed for possible surgery as soon as possible. Each patient has a different need and time for valve replacement.
• Dehiscence of the valve, perforation, fistula, rupture, big abscess, or insufficient antimicrobial therapy (very resistant infections) are indications for considering valve replacement.
Considering the patient
First Stabilization
Evaluate and maintain the heart and respiratory systems in
Acute endocarditis is suspected. It is necessary to promptly assess cardiac conduction and volume status.
Admission Requirements Hospitalization is necessary for monitoring, the start of intravenous antibiotics, and a speedy workup for patients with endocarditis.
Criteria for Discharge
When fevers have subsided for longer than twenty-four hours, vital signs are normal, an antibiotic is prescribed, and follow-up arrangements are established, patients may be released.
Continuing Care Follow-Up Suggestions
• In the short term, keep a watchful eye on patients for endocarditis problems or recurrence, as well as side effects associated with antibiotic medication.
• To record new baseline valve and heart function, a TTE is advised at the end of IE therapy.
Weekly monitoring labs should be sent to patients receiving intravenous antibiotics in accordance with the package insert or guidelines (http://www.idsociety.org/content.aspx?id = 4428#opat).
PATIENT EDUCATION Patients with IE need to know about the symptoms and indicators of valve dysfunction, the significance of maintaining proper oral hygiene, and how to avoid IE related to dental operations.
PROGNOSIS • Higher mortality rates have been linked to infections related to health care, congestive heart failure, aging, S. aureus infections, chronic bacteremia, stroke, and intracardiac abscesses.
• A recent study found that the in-hospital mortality rate linked to PVIE was 22.8%.
COMPLICATIONS
Mycotic aneurysm, meningitis, cerebritis, splenic infarctions, ring abscess, congestive heart failure, cerebral emboli, stroke, kidney infarctions, immune complex glomerulonephritis, periprosthetic leak, heart block, pulmonary embolism with or without infarction in right-sided endocarditis, and splenic abscess.
ENDOCARDITIS (VALVE PROSTHETIC)
ESSENTIALS DESCRIPTION
An infection of prosthetic heart valves or prosthetic material by bacteria, fungus, or infrequently chlamydiae or rickettsiae is known as prosthetic valve endocarditis.
The incidence of epidemiology
Prosthetic valve infective endocarditis (PVIE) affects between 0.3 and 1% of patients annually.
RISK ELEMENTS
• Healthcare-associated infections are the most significant risk factors for the development of prosthetic valve infection.
• Hemodialysis and long-term intravascular access are additional risk factors.
OVERALL PREVENTION
• Patients with the following conditions are advised to avoid endocarditis by taking antibiotics (2):
A prosthetic heart valve or material for valve repair; prior endocarditis
Congenital heart disease (repaired CHD with a persisting defect, unrepaired cyanotic CHD)
Cardiac valvulopathy in recipients of heart transplants
• Prophylaxis is advised for dental operations that include gingival manipulation and disruption of the oral mucosa.
• Patients with the high-risk disorders mentioned above who have procedures involving the respiratory system, soft tissues of the skin, or muscles should also consider prophylaxis. It is not advised to use antibiotics during GI or GU procedures in order to prevent IE.
• Among the antibiotic regimens are a single dosage of either 600 mg of clindamycin or 2 g of amoxicillin 30 to 60 minutes before the surgery.
Pathophysiology
Prosthetic valve endocarditis may arise as a result of contiguous infection spread, secondary infection by hematogenous dissemination, or contamination of the device during implantation.
ETIOLOGY • The most frequent cause of prosthetic valve infection is Staphylococci.
• There are two types of prosthetic valve IE: early-onset, which happens within 60 days of surgery, and late-onset, which happens later.
• While late-onset PVIE is brought on by pathogens that are similar to native valve IE, early-onset PVIE is frequently caused by hospital-acquired pathogens.
• Staphylococcus aureus (20–35%), including MRSA, coagulase negative staphylococcus (17–30%), Streptococcus spp. (1–4%), Enterococcus spp. (5–10%), fungal (5–10%), gram-negative bacilli (6–15%), or culture-negative IE (3–17%) are the most common microbiologic etiologies for early onset IE.
S. aureus (15–20%), coagulase negative staphylococcus (10–20%), Streptococcus spp. (20–30%), Enterococcus spp. (8–13%), fungal (1–3%), gram-negative bacilli (4–7%), or culture-negative (3–12%) IE are the most prevalent microbiologic causes of late onset IE.
• Antibiotics taken within the previous seven days, slow-growing, picky anaerobes, fungi (non-Candida species), Bartonella spp., Coxiella burnetii (Q fever), Legionella spp., Tropheryma whippelii, Chlamydia spp., or Brucella spp. are some of the potential causes of culture-negative endocarditis.
History of Diagnosis
• PVIE's clinical characteristics vary greatly. It might manifest as an acute, toxic illness with high fevers or as a chronic, indolent illness.
• A comprehensive workup for endocarditis is necessary in individuals with prosthetic valves and an inexplicable fever.
• More than 70% of people with PVIE have a fever. Weakness, chills, sweats, anorexia, weight loss, nausea, and malaise are examples of nonspecific symptoms.
• Get a thorough medical history that includes recent travel, exposure to animals, and dietary practices such eating unpasteurized dairy products.
• One popular set of diagnostic criteria for Internet Explorer is the modified Duke criteria. To determine if endocarditis is definite or conceivable, or to rule out the diagnosis completely, they integrate clinical characteristics, microbiologic data, echocardiography, and pathologic data. (Taken from Li and others).
• The primary criterion is microbiological (1) Two sets of blood cultures tested positive for common pathogens, such as Streptococcus bovis, Viridans streptococci, HACEK group, and S.
aureus; or enterococci from the population that don't have a primary focus; or (2) IE-consistent microorganisms from blood cultures that consistently test positive; or (3) a single positive blood culture for Coxiella burnetii or anti-phase 1 IgG antibody titer more than 1:800
Evidence of involvement of the endocardium (1) Positive echocardiography (new partial dehiscence of prosthetic valve, abscess, or oscillating intracardiac mass on valve) (2) New valvular regurgitation (inadequate preexisting murmur or worsening or altering)
• Minor criteria: IDU, predisposing cardiac disease, or predisposition A fever
Vascular manifestations include Janeway's lesions, mycotic aneurysms, septic pulmonary infarcts, cerebral hemorrhages, conjunctival hemorrhages, and major arterial emboli.
Immunologic phenomena include rheumatoid factor, Osler's nodes, Roth's spots, and glomerulonephritis.
Microbiological evidence: Serological evidence of a current infection with an organism consistent with IE or a positive blood culture that does not satisfy one of the key criteria mentioned above
• Two main criteria, one major criterion plus three minor criteria, or five minor criteria are the clinical criteria for definitive endocarditis.
• The pathologic criteria for definitive endocarditis:
microorganisms detected by pathologic or cultural analysis of vegetation, embolized vegetation, or intracardiac abscess; or histological analysis of vegetation or intracardiac abscess exhibiting active endocarditis.
• One main criterion plus one minor criterion, or three minor criteria, may indicate endocarditis.
• Rejected: Does not fulfill clinical criteria for probable IE; has no pathologic evidence of IE at surgery with less than 4 days of antibiotics; has a firm alternative diagnosis; and resolves symptoms in less than 4 days.
MEDICAL EXAMINATION
• A new or altered murmur or signs of congestive heart failure may be found during the cardiac examination.
• A comprehensive examination should be performed to detect embolic events (stroke) or other infection sites (epidural abscess, psoas abscess, septic arthritis).
Tests for Diagnosis and Interpretation Lab
First laboratory testing
• Complete blood count with differential, electrolytes, blood urea nitrogen, creatinine, liver function tests, several sets of blood cultures, urinalysis, and ESR are all part of the initial laboratory examination for suspected IE.
• Get at least three sets of blood cultures within the first twenty-four hours. To increase the likelihood of detecting the causing bacterium, draw multiple sets of blood cultures prior to giving antibiotics. Up to 90% of patients had positive results from the first two sets.
• Elevations of serum inflammatory markers (CRP, ESR) and leukocytosis are frequent.
Follow-up and Particular Points to Remember
• Serologic testing for uncommon pathogens including Q fever and Bartonella spp. may be necessary in cases of culture-negative endocarditis.
• Until the endovascular infection has resolved, obtain two sets of blood cultures every 24 to 48 hours.
Imaging First Step
• The preferred imaging procedure is transesophageal echocardiography (TEE). Because of the high incidence of paravalvular problems and artifact from mechanical prosthesis, TEE is recommended over transthoracic echocardiography.
and a tiny amount of greenery. TEE can identify vegetation with a sensitivity of 86–94% and a specificity of 91–100%.
• When prosthetic valve IE is suspected, a TEE should be conducted as soon as feasible.
Follow-up and Particular Points to Remember
If there is a suspicion of emboli, abscesses, or mycotic aneurysm, further imaging of the brain, spine, abdomen, or lungs is necessary.
Diagnostic Techniques and Other
To determine a baseline heart rhythm and detect any conduction diseases, have an EKG. Bradycardia, syncope, presyncope, or a change in clinical state all call for a repeat EKG.
Pathological Results
• According to histopathologic analysis, vegetations are made up of bacterial or fungal masses, fibrin, and platelet aggregates.
• Some laboratories offer PCR-based assays on blood or valvular tissue for hard-to-culture organisms including T. whippleii and Bartonella spp., which may be indicated in certain cases of culture negative results.
endocarditis.
DISTINCTIVE DIAGNOSIS
Other systemic illnesses including malaria, bacteriemia, or fungemia without IE, as well as noninfectious endocarditis.
MEDICATION FOR TREATMENT
• To break through the vegetation and stop recurrence, prolonged antibacterial treatment is necessary. It is critical to identify the causal organism and medication susceptibilities.
• The severity of the illness, local resistance patterns, and patient risk factors for different pathogens are the foundations of empirical therapy.
• The following is a list of suggested treatment plans for specific pathogens (1).
• Penicillin G 24 million U/24 h (given continuously or in 4–6 doses) • Penicillin susceptible Viridans streptococci, S. bovis, or other streptococci (minimum inhibitory concentration ≤0.12 μg/mL) or, if PCN and ceftriaxone are intolerant or allergic, ceftriaxone 2g IV daily for 6 weeks + gentamicin 3 mg/kg/d in a single dosage for 2 weeks – Vancomycin 30 mg/kg/d in 2 divided doses for 6 weeks
MIC >0.12 μg/mL or ≤0.5 μg/mL for streptococci that are highly resistant to penicillin; Penicillin G 24 million U/24 h (dosed continuously or
Vancomycin 30 mg/kg/d in 2 divided doses plus gentamicin 3 mg/kg/d in 3 divided doses for 6 weeks if ampicillin allergy; or ceftriaxone 2g IV daily plus gentamicin 3 mg/kg/d in 1 dose for 6 weeks; Streptococci resistant to penicillin (MIC >0.5 μg/mL) and enterococci – Ampicillin 12 g/d in 6 divided doses plus gentamicin 3 mg/kg/d in 3 divided doses for 6 weeks
Methicillin-resistant staphylococci: Vancomycin 30 mg/kg/d in 2 divided doses plus rifampin 900 mg/d in 3 divided doses for ≥6 weeks plus gentamicin 3 mg/kg/d in 2 or 3 divided doses for 2 weeks; Methicillin-susceptible staphylococci: Nafcillin 12 g/d IV in 6 divided doses plus rifampin 900 mg/d in 3 divided doses for ≥6 weeks plus gentamicin 3 mg/kg/d in 2 or 3 divided doses for 2 weeks; The doses above are based on normal renal function.
ADDITIONAL MEDICATION
Overall Actions
When clinically stable, refer IDU patients to drug treatment programs.
Referral Issues
Infectious endocarditis of the prosthetic valve and its aftereffects can be fatal, and complicated management problems are frequent. It is crucial to have a multidisciplinary strategy that incorporates input from infectious diseases, cardiology, and cardiovascular surgery.
OTHER PROCEDURES AND SURGERY
• Patients with endocarditis from prosthetic valves should be assessed for possible surgery as soon as possible. Each patient has a different need and time for valve replacement.
• Dehiscence of the valve, perforation, fistula, rupture, big abscess, or insufficient antimicrobial therapy (very resistant infections) are indications for considering valve replacement.
Considering the patient
First Stabilization
Evaluate and maintain the heart and respiratory systems in
Acute endocarditis is suspected. It is necessary to promptly assess cardiac conduction and volume status.
Admission Requirements Hospitalization is necessary for monitoring, the start of intravenous antibiotics, and a speedy workup for patients with endocarditis.
Criteria for Discharge
When fevers have subsided for longer than twenty-four hours, vital signs are normal, an antibiotic is prescribed, and follow-up arrangements are established, patients may be released.
Continuing Care Follow-Up Suggestions
• In the short term, keep a watchful eye on patients for endocarditis problems or recurrence, as well as side effects associated with antibiotic medication.
• To record new baseline valve and heart function, a TTE is advised at the end of IE therapy.
Weekly monitoring labs should be sent to patients receiving intravenous antibiotics in accordance with the package insert or guidelines (http://www.idsociety.org/content.aspx?id = 4428#opat).
PATIENT EDUCATION Patients with IE need to know about the symptoms and indicators of valve dysfunction, the significance of maintaining proper oral hygiene, and how to avoid IE related to dental operations.
PROGNOSIS • Higher mortality rates have been linked to infections related to health care, congestive heart failure, aging, S. aureus infections, chronic bacteremia, stroke, and intracardiac abscesses.
• A recent study found that the in-hospital mortality rate linked to PVIE was 22.8%.
COMPLICATIONS
Mycotic aneurysm, meningitis, cerebritis, splenic infarctions, ring abscess, congestive heart failure, cerebral emboli, stroke, kidney infarctions, immune complex glomerulonephritis, periprosthetic leak, heart block, pulmonary embolism with or without infarction in right-sided endocarditis, and splenic abscess.
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