Background. Infective endocarditis (IE) remains a serious condition with a high incidence rate, ranging from 2.6 to 7 cases per 100,000 people, and has been increasing over recent decades. Intracardiac abscess (ICA) is one of the most severe complications of infective endocarditis, occurring in 30–40 % of cases involving native heart valves. Heart failure, the most common complication, is observed in 19–73 % of patients and often requires urgent surgical intervention. Objective: to determine the optimal diagnostic and treatment algorithm for patients with infective endocarditis complicated by acute heart failure (AHF) and intracardiac abscess. Materials and methods. From 2010 to 2023, at the Amosov National Institute of Cardiovascular Surgery of the National Academy of Medical Sciences of Ukraine, 473 surgeries were performed for active infectious endocarditis complicated by intracardiac abscesses, accounting for 15 % of all cases of IE. A comprehensive approach was used, including autopericardial patches, abscess debridement, reconstruction of the heart chambers, fibrous ring repair, valve replacement, and methods for preventing recurrences. Results. The patients were divided into two groups: ICA with AHF (N = 135, 28.5 %) and ICA without AHF (N = 338, 71.5 %). The average age of participants was 49.2 ± 1.2 years. In the overall group, procalcitonin and C-reactive protein levels were evaluated to characterize the inflammatory process. The inflammatory markers included leukocyte count, elevated erythrocyte sedimentation rate, and levels of C-reactive protein and procalcitonin. High levels of these markers indicate signs of persistent infection syndrome, immunosuppression, and catabolism. Increased blood lactate levels suggest tissue hypoxia and organ dysfunction. Acute heart failure was characterized by elevated levels of NT-proBNP, troponin, and creatine phosphokinase-MB. One hundred and thirty-five (28.5 %) infective endocarditis patients with ICA and signs of AHF at the preoperative stage of IV FC formed the study group. Conclusions. Successful treatment of IE depends on early surgical intervention and effective antibiotic therapy. Early detection of complications such as AHF and intracardiac abscesses is critically important. Autopericardial patches and modern surgical techniques significantly improve patient outcomes. Elevated markers such as NT-proBNP, troponin, C-reactive protein, procalcitonin, and lactate indicate the severity of the condition.
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