Infective endocarditis

Infective endocarditis (IE) is an infectious inflammation of the inner lining of the heart (endocardium), most commonly affecting the heart valves. This serious, potentially life-threatening condition can be caused by a variety of pathogens, including bacteria, fungi, and rarely viruses. Infective endocarditis can lead to serious complications such as heart failure, thromboembolic events, and death, making it an important topic in cardiology and infectious diseases. Early recognition and prompt therapy are critical to prevent adverse outcomes.

History of the disease and interesting historical facts

The history of infective endocarditis goes back more than a century. The first mentions of this disease can be found in works of the 19th century. Clinicians of that time observed rapidly progressing forms of endocarditis and associated them with inflammatory processes in combination with infections. Significant progress in understanding the etiology of the disease occurred in the 1940s after the introduction of antibiotics, which made it possible to treat bacterial infections, which were often the cause of endocarditis. However, infective endocarditis still remains a serious problem. In the 1970s, the association of IE with dental procedures became known, which led to changes in recommendations for prophylaxis in predisposed patients. These facts emphasize the importance of considering both historical and modern perspectives in the diagnosis and treatment of endocarditis.

Epidemiology

Infective endocarditis is a rare disease, but has a high mortality rate, which can reach 25-30% even with adequate therapy. According to statistics, in European countries, the incidence is about 3-5 cases per 100,000 population per year. In recent decades, there has been an increase in the number of cases, which may be due to the increased life expectancy of patients with cardiovascular diseases and the increase in the number of invasive medical procedures. Specific risk groups include patients with pre-existing heart disease, injection drug users, and those receiving permanent intravenous catheters. According to various research papers, most cases of infective endocarditis are associated with hemolytic streptococci and staphylococci, which emphasizes the importance of statistical observations.

Genetic predisposition to this disease

To date, genetic predisposition to infective endocarditis is still poorly understood. Some studies have identified genes involved in immune response and inflammation, which may be a risk factor for individual patients. For example, inherited mutations affecting the complement system may increase the likelihood of developing ischemia or infection. It is important to note that true genetic predisposition is considered multifactorial, including both genetic and environmental factors, such as the microbiome and comorbidities. There are studies that confirm that a single mutation may not be sufficient to develop IE, indicating the need for a comprehensive analysis of the patient's body.

Risk factors for the development of this disease

Risk factors for infective endocarditis can be divided into two main categories: physical and chemical. Physical factors include:

• Pre-existing cardiovascular disease (eg, heart defects, prosthetic heart valves);
• Heart rhythm disturbances;
• Injection drug addiction, and especially the administration of drugs through non-sterile instruments;
• History of recurrent infections;
• Concomitant diseases (eg, diabetes, cancer).

Chemical factors include:

• Long-term use of intravenous catheters;
• Poor oral hygiene, which can lead to bacteremia;
• Regular invasive medical procedures (eg, dental procedures).

Understanding such factors allows for more effective identification of high-risk groups and improved prevention efforts.

Diagnosis of this disease

Diagnosis of infective endocarditis is based on clinical manifestations, laboratory and radiological methods. The main symptoms include:

• Fever;
• General malaise and weakness;
• Joint pain;
• Enlarged spleen;
• Skin rashes (eg, petechiae, hemorrhagic purpura).

Laboratory tests include blood cultures, which are the gold standard for diagnosing IE. Multiple blood samples are usually required to increase the likelihood of detecting the pathogen. Radiological examinations, including echocardiography, are an important diagnostic step, revealing the presence of abscesses, valvular lesions, and other abnormalities. In specialized practice, computed tomography and magnetic resonance imaging are also used.

Differential diagnosis involves distinguishing infective endocarditis from other conditions such as thromboembolism, infectious myocarditis and other infectious diseases, especially in the acute stages. This is especially important, since the choice of treatment and further preventive measures depend on the correct diagnosis.

Treatment

Treatment of infective endocarditis can be either conservative or surgical. Conservative treatment includes antibacterial therapy based on the sensitivity of the identified pathogens. High doses of penicillin or cephalosporins are most often used. If the pathogen is staphylococcus, vancomycin is often prescribed. In the case of fungal endocarditis, treatment is carried out using antifungal agents such as amphotericin B.

Surgery may be necessary in cases where heart valves are damaged or there is significant heart failure. Such interventions may include valve replacement or drainage of abscesses.

Other treatments may include immunomodulatory therapy aimed at improving the patient's overall condition and recovery from the disease.

List of medications used to treat this disease

• Penicillin;
• Cephalosporins (eg, cephalexin, ceftriaxone);
• Vancomycin;
• Amphotericin B;
• Gentamicin (especially in combination with other antibiotics);
• Fluconazole (for fungal infections).

These drugs are used depending on the identified pathogen and the patient's condition, ensuring maximum therapeutic effectiveness.

Disease monitoring

Monitoring the patient's condition with infective endocarditis includes regular examinations by a cardiologist and laboratory tests for the presence of the pathogen. Monitoring the level of antibiotics in the blood is of great importance to determine the adequacy of treatment. The prognosis depends on many factors, including the infectious agent, the time of initiation of treatment, the presence of concomitant diseases, and the patient's age. Without timely assistance, the risk of complications (such as thromboembolism or heart failure) increases significantly.

Age-related features of the disease

Infective endocarditis may manifest itself differently in different age groups. In children and elderly patients, the disease may have a more subtle clinical picture, which complicates diagnosis. In childhood, IE is more often associated with congenital heart defects, while in elderly patients it is caused by rheumatic processes and concomitant pathologies. Both groups require special attention to diagnosis and treatment to reduce the risk of serious complications.

Questions and Answers

• What is infective endocarditis? Infective endocarditis is an infectious inflammation of the inner lining of the heart caused by various pathogens, most often bacteria.
• What are the main symptoms of this disease? The main symptoms include fever, general weakness, joint pain and possibly a skin rash.
• How is infective endocarditis diagnosed? Diagnosis includes clinical symptoms, laboratory tests such as blood cultures, and radiological examinations such as echocardiography.
• How is infective endocarditis treated? Treatment may include antibiotic therapy and surgery, depending on the severity and specificity of the disease.
• What risk factors contribute to the development of infective endocarditis? These include the presence of cardiovascular disease, injection drug addiction and long-term use of catheters.

Advice from Dr. Oleg Korzhikov

Dr. Oleg Korzhikov recommends paying attention to preventive measures for infective endocarditis, especially for people with a predisposition to this disease. “It is important to maintain good oral hygiene, avoid injection drug abuse, and undergo regular medical examinations. This is especially important before any invasive procedures, such as dentistry or surgery, to prevent the development of potentially dangerous infections,” the doctor advises.