Endocarditis: Symptoms, Causes & Heart Infection Treatment
Endocarditis is an infection of the inner lining of the heart. It usually affects the heart valves. When bacteria or other germs enter the bloodstream, they can attach to damaged or abnormal heart tissue.
Without treatment, endocarditis can destroy heart valves and cause life-threatening complications.
What Happens in Endocarditis?
The inner surface of the heart is called the endocardium. Bacteria that enter the blood can stick to this surface. They form small clumps called vegetations.
These clumps grow on the valves. They block normal blood flow. They can also break off and travel to the brain, lungs, or kidneys.
This is what makes endocarditis dangerous. It does not just affect the heart. It can harm many organs at once.
Who Is at Risk?
Some people are more likely to develop endocarditis than others.
People with structural heart defects are at higher risk. This includes those born with a bicuspid aortic valve (BAV). A normal aortic valve has three leaflets. A bicuspid aortic valve has only two. This makes it more prone to infection.
Other structural problems that raise risk include ventricular septal defect (VSD) and atrial septal defect (ASD). These are holes in the walls of the heart. They are part of congenital heart disease and can create abnormal blood flow patterns that attract bacteria.
Heart valve regurgitation is another risk factor. When a valve leaks blood backward, the turbulence can damage tissue over time. Damaged tissue is easier for bacteria to attach to.
Common Causes
Most cases are caused by bacteria. They enter the bloodstream through cuts, dental work, medical procedures, or skin infections.
The most common bacteria involved are Streptococcus and Staphylococcus species. Staph aureus is especially dangerous. It spreads quickly and causes severe valve damage.
Less often, fungi or other organisms cause endocarditis. These cases are harder to treat.
Some patients have an autoimmune disease overlap that makes diagnosis harder. Inflammation from autoimmune conditions can mimic infection.
Symptoms
Symptoms can start slowly or come on fast.
Common signs include:
- Fever and chills
- Fatigue
- Muscle or joint pain
- Night sweats
- Shortness of breath
- New or changed heart murmur
- Small red spots under the skin or nails
Some patients develop stroke warning signs and symptoms. This happens when vegetations break off and block blood flow to the brain. Ischemic stroke can occur without warning. A transient ischemic attack (TIA) may come first. This is a brief episode where stroke symptoms appear and then go away.
Any sudden weakness, speech problem, or vision change needs emergency care right away.
Diagnosis
Doctors use several tools to confirm endocarditis.
Blood cultures are the most important test. They identify the type of bacteria causing the infection.
Inflammation biomarkers such as C-reactive protein (CRP) are measured through blood tests. High CRP levels suggest active infection or inflammation in the body.
An electrocardiogram (ECG/EKG) checks the heart’s electrical activity. It can show rhythm problems caused by the infection spreading near the heart’s electrical system.
Advanced cardiac imaging, especially echocardiography, shows vegetations on the valves. It also measures valve function and detects heart failure complications early.
In some cases, cardiac catheterization is used. This helps evaluate coronary arteries before surgery and rules out coronary thrombosis or silent ischemia that may coexist.
How It Progresses
If not treated, endocarditis causes serious damage.
Valves can be destroyed. This leads to severe heart valve regurgitation. Blood leaks backward with each heartbeat. The heart works harder. Over time, heart failure develops.
Vegetations can break apart. Pieces travel through the blood. This is called plaque rupture embolization. These pieces can block arteries in the brain, kidneys, or lungs.
Dangerous heart rhythms can develop. In severe cases, sudden cardiac death is possible.
The infection can also spread to surrounding heart tissue. This may require emergency surgery.
Treatment
Treatment depends on the type of germ involved and how severe the damage is.
Most patients receive antibiotics through an IV for four to six weeks. The type of antibiotic depends on blood culture results.
Surgery may be needed when:
- Valves are severely damaged
- The infection does not respond to antibiotics
- Vegetations are large and likely to break off
- Heart failure complications develop
During surgery, damaged valves are repaired or replaced. Infected tissue is removed.
After treatment, close monitoring is required. Some patients need long-term antibiotics to prevent recurrence.
Living With Endocarditis
Recovery takes time. Most people need weeks of IV antibiotics followed by close follow-up visits.
It is important to tell your dentist and all doctors about your history of endocarditis. Some procedures require antibiotic prevention beforehand.
Watch for any returning symptoms. Fever, chills, or new shortness of breath should be reported quickly.
Avoid activities that raise infection risk. Good dental hygiene matters a lot. Bacteria from the mouth are a leading cause of endocarditis.
Final Thoughts
Endocarditis is a serious heart infection. It can damage valves, cause stroke, and lead to heart failure if not caught early.
Know your risk. People with congenital heart disease, valve problems, or a history of endocarditis need extra care during medical procedures.
Seek medical attention at the first sign of fever with unexplained fatigue or a new heart murmur. Early treatment protects the heart and saves lives.