Infective Endocarditis with Unknown Etiology: Possibilities of Conquering and Role of Microbiologistics

Infective endocarditis (IE) caused by Gram-negative bacteria is a rare and insufficiently characterized form of endocarditis. The literature review presents data on the frequency, course, risk factors, diagnosis and treatment of both IE caused by the HACEK microorganisms (Haemophilus spр., Aggregatibacter spp., Cardiobacterium hominis, Eikenella corrodens, Kingella) and other Gram-negative bacteria. Gram-negative bacteria are the cause of 3.6–13.6 % IE cases (HACEK microorganisms in 0.8–3 % of IE cases in adults, non-HACEK in 1.8–3.9 %). Patients with IE caused by the HACEK microorganisms are younger, their disease is not associated with previous in-hospital treatment and is subacute with favorable prognosis (intrahospital mortality is 2–3 %). HACEK microorganisms mostly retain sensitivity to many antibiotics. Risk factors of IE caused by HACEK microorganisms are dental interventions, heart disorders, valve prostheses and other implanted cardiac devices. IE caused by non-HACEK Gram-negative bacteria is more common in elderly with concomitant disorders and usually is acute; intrahospital mortality is 13–36.5 %. Risk factors of IE caused by non-HACEK microorganisms are valve prostheses, electrical pacemakers, venous and central catheters, recent in-hospital treatment, Gram-negative bacteremia, decreased immunity, drug abuse, urinary infection, alcoholism, cirrhosis of the liver, removed spleen, consequences of dog and cat bites, working with the soil. Among Gram-negative non-HACEK bacteria causing IE, 28 % have multi-drug resistance (MDR / XDR) against antibiotics. Therefore, Gram-negative bacteria rarely cause IE but during selection of empiric therapy in patients with IE with corresponding risk factors, probability of Gram-negative causative microorganisms in IE etiology should be taken into account.

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Global and national trends in the evolution of infective endocarditis

Кобалава

Kotova

2023

Kardiologiia

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For the recent 20 years, substantial changes have occurred in all aspects of infectious endocarditis (IE), the evolution of risk factors, modernization of diagnostic methods, therapeutic and preventive approaches. The global trends are characterized by increased IE morbidity among people older than 65 who use intravenous psychoactive drugs. The epidemiological trend is represented by reduced roles of chronic rheumatic heart disease and congenital heart defects, increased proportion of IE associated with medical care, valve replacement, installation of intracardiac devices, and increased contribution of Staphylococcus spp. and Enterococcus spp. to the IE etiology. Additional visualization methods (fluorodeoxyglucose positron emission tomography with 18F-fludesoxyglucose (18F-FDG PET-CT), labeled white blood cell single-photon emission computed tomography (SPECT), and modernization of the etiological diagnostic algorithm for determining the true pathogen (immunochemistry, polymerase chain reaction, sequencing) also become increasingly important. The COVID-19 pandemic has also adversely contributed to the IE epidemiology. New prospects of treatment have emerged, such as bacteriophages, lysins, oral antibacterial therapy, minimally invasive surgical strategies (percutaneous mechanical aspiration), endovascular mechanical embolectomy. The physicians’ compliance with clinical guidelines (CG) is low, which contributes to the high rate of adverse outcomes of IE, while simple adherence to the CG together with more frequent use of surgical treatment doubles survival. Systematic adherence to CG, timely prevention and implementation of the Endocarditis Team into practice play the decisive role in a favorable prognosis of dynamically changing IE. This article presents the authors’ own data that confirm the evolutionary trends of current IE.

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Infective Endocarditis with Unknown Etiology: Possibilities of Conquering and Role of Microbiologistics

Cited by 4 publications

References 46 publications

Infectious endocarditis and infection of intracardiac devices in adults. Clinical guidelines 2021

Infectious endocarditis and infection of intracardiac devices in adults. Clinical guidelines 2021

Infective endocarditis caused by gram-negative bacteria

Global and national trends in the evolution of infective endocarditis

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