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Infective endocarditis is the presence of a microbial infection on the endocardial surface (the inner surface of the heart). It is the most common cardiovascular infection and is highly significant due to its potential severity and the fact that it can present in different clinical forms.
Infective endocarditis primarily affects the heart valves, whether natural or artificial, although it can sometimes involve other structures of the heart. It is classified according to the duration of the infection (days, weeks, or months) and the type of causative microorganism (bacteria, yeast, or fungi).
The characteristic lesion of infective endocarditis is the endocardial vegetation. This consists of an abnormal aggregate of platelets, fibrin, bacteria, and inflammatory cells that adheres to the inner surface of the heart—typically a heart valve—and can detach, causing infectious emboli in distant organs such as the skin, nervous system, or extremities.
It is considered a serious disease. Although most cases are curable, it carries significant complications and mortality even with treatment. In many cases, achieving a definitive cure requires surgical intervention to remove affected tissue and replace the valve with an artificial one.
In the acute form, infective endocarditis may cause high fever, chills, prostration, and rapid deterioration of general condition over hours or days.
In subacute forms, with progression over weeks or months, the main symptoms are fatigue, loss of appetite, and mild fever. In these cases, characteristic skin lesions, such as nodules or spots, may also occur, although not always.
In patients with severe valve involvement, valvular dysfunction may develop, resulting in heart failure symptoms, such as significant shortness of breath and edema in the lower limbs.
Infective endocarditis has a global incidence of 2–3 cases per 100,000 people per year. In Catalonia, around 200 new cases are diagnosed annually. Its incidence increases significantly with age, reaching 15–30 cases per 100,000 people per year in individuals over 65—about 10 times higher than in younger populations.
The causative agents have changed over recent decades. Previously, streptococci, particularly viridans streptococci, were the most common. Currently, the most frequent pathogens are staphylococci, followed by streptococci and enterococci. However, any microorganism present in the blood can adhere to a heart valve, especially if it is previously damaged or artificial.
Diagnosis is primarily based on:
- blood cultures: to identify the causative microorganism and guide selection of the appropriate antibiotic therapy.
- echocardiography: to locate endocardial vegetations, assess valve function, and determine the need for surgery in certain patients.
In some cases, additional imaging (CT scans, nuclear medicine scans) is necessary to detect peripheral emboli, which are common at diagnosis or during treatment.
Treatment of infective endocarditis is antibiotic therapy, specifically targeted at the causative microorganism. Doses are high and prolonged, because vegetations are poorly vascularized and the antibiotic must penetrate by diffusion from circulating blood.
Patients who do not respond adequately to antibiotic therapy, or who develop significant valvular damage, may require valve replacement surgery.
Blood cultures and echocardiography, both at diagnosis and during follow-up, to monitor disease progression.
In individuals with known valvular abnormalities, antibiotic prophylaxis is recommended before dental procedures or gum surgery, following specialist guidance.
Preventive measures should also be taken during endoscopic procedures, especially upper gastrointestinal endoscopy (gastroscopy), according to the prescribed antibiotic regimen.
This prevention is crucial because the presence of bacteria in the bloodstream during such procedures significantly increases the risk of infective endocarditis.
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