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Infective endocarditis due to anaerobic and microaerophilic bacteria
Abstract:
Seven cases of infective endocarditis (IE) due to anaerobic or microaerophilic bacteria were seen in a period of 42 months at Rancho Los Amigos Hospital (Downey, California), representing 10.6 percent of the total number of 66 cases that carried the diagnosis of IE. Five of the 66 patients had polymicrobial endocarditis. Three of five patients with polymicrobial endocarditis had at least one anaerobic or microaerophilic microorganism isolated from the blood, and all five patients practiced intravenous drug abuse. Six of the seven patients with anaerobic or microaerophilic IE were women. The three patients who had anaerobic Gram-negative bacillary endocarditis were drug abusers. None of the isolated organisms were Bacteroides fragilis. The following heart valves were involved in the seven patients with anaerobic or microaerophilic IE: tricuspid (three), mitral (two), aortic (one) and tricuspid plus aortic (one). Three of the seven patients had preexistent valvular disease, and two required tricuspid valvulectomy. Only one patient had serious systemic embolism (cerebral), but all four drug abusers had septic pulmonary embolism. All seven patients recovered with appropriate antimicrobial therapy.
Insights
Infective endocarditis (IE) caused by anaerobic or microaerophilic bacteria is uncommon but treatable. This study highlights key patient demographics and outcomes for this rare form of IE.
Area of Science:
- Infectious Diseases
- Cardiology
- Microbiology
Background:
- Infective endocarditis (IE) is a serious infection affecting heart valves.
- IE caused by anaerobic or microaerophilic bacteria is rare, with limited data available.
- Intravenous drug abuse is a known risk factor for IE.
Purpose of the Study:
- To describe the clinical characteristics, causative organisms, and outcomes of IE due to anaerobic or microaerophilic bacteria.
- To identify risk factors and complications associated with this specific type of IE.
Main Methods:
- Retrospective case series analysis of patients diagnosed with IE.
- Identification and characterization of anaerobic or microaerophilic bacteria from blood cultures.
- Review of patient demographics, medical history, echocardiographic findings, treatment, and outcomes.
Main Results:
- Seven cases (10.6%) of anaerobic or microaerophilic IE were identified over 42 months.
- Six of seven patients were women; three patients with anaerobic Gram-negative bacillary endocarditis were intravenous drug abusers.
- The tricuspid valve was most commonly affected; septic pulmonary embolism was frequent in drug abusers.
Conclusions:
- Infective endocarditis due to anaerobic or microaerophilic bacteria, though infrequent, can occur and is associated with specific risk factors like intravenous drug abuse.
- Prompt diagnosis and appropriate antimicrobial therapy are crucial for favorable outcomes, even in complex cases.
- Further research is needed to understand the specific pathogens and optimal management strategies for this rare IE subtype.