Symptoms
Common signs and symptoms of Endocarditis (Infectious) include:
When to see a doctor
If you experience severe or worsening symptoms, seek immediate medical attention. Always consult with a healthcare professional for proper diagnosis and treatment.
Causes & Risk Factors
Several factors can contribute to Endocarditis (Infectious).
Infectious endocarditis develops when germs enter the bloodstream and travel to the heart, where they attach to abnormal or damaged areas of the endocardium.
Infectious endocarditis develops when germs enter the bloodstream and travel to the heart, where they attach to abnormal or damaged areas of the endocardium. The most common culprits are bacteria, particularly Staphylococcus aureus, which can cause aggressive infections even on normal heart valves. Streptococcus species, especially viridans group streptococci from the mouth, tend to infect already abnormal valves more gradually. Other bacteria like Enterococcus, HACEK organisms, and even fungi can also cause endocarditis, particularly in people with compromised immune systems.
These microorganisms can enter the bloodstream through various routes.
These microorganisms can enter the bloodstream through various routes. Dental procedures, even routine cleanings, can release mouth bacteria into circulation. Everyday activities like brushing teeth with poor dental hygiene, using contaminated needles for drug injection, or having infected skin conditions can also provide entry points. Medical procedures involving catheters, dialysis access sites, or surgical wounds create additional opportunities for bacteria to reach the bloodstream.
Once in circulation, these germs typically flow harmlessly past normal heart tissue.
Once in circulation, these germs typically flow harmlessly past normal heart tissue. However, they readily stick to areas where blood flow is turbulent or where the endothelium is already damaged. Abnormal heart valves, previous endocarditis, congenital heart defects, prosthetic valves, and even age-related valve thickening create ideal conditions for bacterial attachment. The bacteria then multiply, attracting immune cells and forming the characteristic infected clumps that define endocarditis.
Risk Factors
- Previous episode of endocarditis
- Artificial heart valves or other cardiac devices
- Congenital heart defects or valve abnormalities
- History of rheumatic heart disease
- Intravenous drug use with shared needles
- Poor dental hygiene or active dental infections
- Frequent medical procedures requiring catheters
- Chronic kidney disease requiring dialysis
- Compromised immune system from illness or medications
- Advanced age with degenerative valve changes
Diagnosis
How healthcare professionals diagnose Endocarditis (Infectious):
- 1
Diagnosing infectious endocarditis requires careful detective work, as symptoms often mimic other conditions and can develop gradually over weeks or months.
Diagnosing infectious endocarditis requires careful detective work, as symptoms often mimic other conditions and can develop gradually over weeks or months. Doctors typically start with a thorough physical examination, listening carefully for new heart murmurs and checking for characteristic skin findings like splinter hemorrhages under fingernails or Janeway lesions on palms and soles. They also look for enlarged spleen, swollen lymph nodes, and signs of heart failure.
- 2
Blood tests form the cornerstone of diagnosis, with multiple blood cultures drawn from different sites to identify the specific organism causing infection.
Blood tests form the cornerstone of diagnosis, with multiple blood cultures drawn from different sites to identify the specific organism causing infection. These cultures must be obtained before starting antibiotics whenever possible, as medication can make bacteria harder to detect. Additional blood work checks for elevated white blood cell counts, anemia, kidney function problems, and inflammatory markers like erythrocyte sedimentation rate and C-reactive protein.
- 3
Echocardiography provides the most direct view of infected heart valves, with transesophageal echocardiography (TEE) being more sensitive than standard chest wall ultrasound for detecting vegetations and valve damage.
Echocardiography provides the most direct view of infected heart valves, with transesophageal echocardiography (TEE) being more sensitive than standard chest wall ultrasound for detecting vegetations and valve damage. This procedure involves passing a specialized ultrasound probe down the throat to get clearer images of the heart structures. CT scans or MRI may be ordered to look for embolic complications in the brain, lungs, or other organs. The diagnosis is confirmed using established criteria that combine clinical findings, blood culture results, and imaging evidence.
Complications
- Heart valve destruction represents the most serious complication of infectious endocarditis, potentially leading to severe heart failure that requires emergency surgery.
- The infection can cause valve leaflets to perforate, supporting structures to rupture, or vegetations to interfere with proper valve closure.
- These changes can develop rapidly, particularly with aggressive organisms like Staphylococcus aureus, and may result in life-threatening pulmonary edema or cardiogenic shock.
- Embolic complications occur when pieces of vegetations break off and travel through the bloodstream to other organs.
- Brain emboli can cause strokes, seizures, or brain abscesses, while emboli to the lungs, kidneys, spleen, or extremities can cause tissue death and organ dysfunction.
- Large vegetations, particularly those larger than 10 millimeters, carry higher embolic risk.
- These complications can occur even during appropriate antibiotic treatment and represent one reason why surgery is sometimes recommended for large vegetations even in stable patients.
Prevention
- Preventing infectious endocarditis focuses primarily on reducing bacteremia in high-risk individuals and maintaining excellent dental hygiene for everyone.
- People with certain heart conditions receive antibiotic prophylaxis before dental procedures that are likely to cause bleeding, including tooth extractions, periodontal surgery, and professional cleanings in patients with poor oral health.
- Current guidelines limit prophylaxis to the highest-risk patients: those with prosthetic valves, previous endocarditis, certain congenital heart diseases, or heart transplant recipients with valve problems.
- Daily oral hygiene provides the most effective prevention for most people, as maintaining healthy teeth and gums reduces the bacterial load that enters the bloodstream during routine activities like tooth brushing.
- Regular dental checkups, prompt treatment of dental infections, and avoiding tooth jewelry help minimize risk.
- For people who inject drugs, using sterile needles and equipment prevents the introduction of skin bacteria directly into the bloodstream.
- Healthcare-associated prevention involves proper catheter care, sterile technique during medical procedures, and prompt removal of unnecessary invasive devices.
- Patients with prosthetic valves or other cardiac devices should inform all healthcare providers about their increased risk and ensure proper antibiotic prophylaxis when indicated.
- Maintaining overall health through good nutrition, exercise, and management of chronic conditions like diabetes also supports the immune system's ability to fight off potential infections.
Treating infectious endocarditis requires intensive antibiotic therapy tailored to the specific organism identified in blood cultures.
Treating infectious endocarditis requires intensive antibiotic therapy tailored to the specific organism identified in blood cultures. Treatment typically begins in the hospital with high-dose intravenous antibiotics continued for four to six weeks, depending on the bacteria involved and the patient's response. Staphylococcus aureus infections often require combination therapy with drugs like nafcillin or vancomycin plus gentamicin, while streptococcal infections may respond to penicillin or ceftriaxone. The lengthy treatment course is necessary because bacteria within vegetations are difficult for antibiotics to penetrate and eliminate completely.
Surgical intervention becomes necessary in many cases, particularly when heart valves are severely damaged, vegetations are large and likely to break off, or medical therapy fails to clear the infection.
Surgical intervention becomes necessary in many cases, particularly when heart valves are severely damaged, vegetations are large and likely to break off, or medical therapy fails to clear the infection. Valve repair or replacement surgery may be performed even while infection is still active if the benefits outweigh the risks. Prosthetic valve endocarditis almost always requires surgical removal of infected hardware. Timing of surgery requires careful coordination between cardiologists, cardiac surgeons, and infectious disease specialists.
Supportive care addresses complications as they arise, including treatment for heart failure with diuretics and ACE inhibitors, management of embolic strokes, and kidney support if infection affects renal function.
Supportive care addresses complications as they arise, including treatment for heart failure with diuretics and ACE inhibitors, management of embolic strokes, and kidney support if infection affects renal function. Patients require close monitoring for signs of treatment failure, new embolic events, or surgical complications. Regular echocardiograms track vegetation size and valve function throughout treatment.
Emerging treatments show promise for difficult cases, including newer antibiotics like daptomycin for resistant organisms and novel approaches to prevent bacterial adhesion.
Emerging treatments show promise for difficult cases, including newer antibiotics like daptomycin for resistant organisms and novel approaches to prevent bacterial adhesion. Some centers are exploring percutaneous valve replacement techniques for high-risk surgical candidates. Long-term outcomes depend heavily on early diagnosis and appropriate treatment, with mortality rates ranging from 10-30% depending on the organism, patient factors, and presence of complications.
Living With Endocarditis (Infectious)
Living with a history of infectious endocarditis requires ongoing vigilance and lifestyle adjustments to prevent recurrence while maintaining quality of life. Patients must become advocates for their own care by informing all healthcare providers about their history, ensuring proper antibiotic prophylaxis before dental procedures, and seeking immediate medical attention for unexplained fevers or other concerning symptoms. Carrying a medical alert card or wearing identification jewelry helps emergency responders provide appropriate care.
Latest Medical Developments
Latest medical developments are being researched.
Frequently Asked Questions
Update History
Mar 19, 2026v1.0.0
- Published by DiseaseDirectory