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Related Concept Videos

Heart Valves01:16

Heart Valves

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The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
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Layers of the Heart Wall01:15

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The heart wall comprises three distinct layers: the epicardium, myocardium, and endocardium. The outermost layer, the epicardium, is the visceral layer of the serous pericardium, featuring a thin, transparent mesothelial surface and an inner layer of areolar connective tissue with fat deposits that increase with age.
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Related Experiment Video

Updated: May 31, 2025

An In Vitro Model of a Parallel-Plate Perfusion System to Study Bacterial Adherence to Graft Tissues
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Bacterial Diversity in Native Heart Valves in Infective Endocarditis.

Anna Sinitskaya1, Alexander Kostyunin2, Maxim Asanov1

  • 1Laboratory of Genome Medicine, Research Institute for Complex Issues of Cardiovascular Diseases, 650002 Kemerovo, Russia.

Biomedicines
|January 25, 2025
PubMed
Summary

This study identified diverse opportunistic bacteria in infective endocarditis (IE) heart valves using 16S rRNA metabarcoding. This advanced technique complements routine tests for better pathogen detection and improved IE therapy.

Keywords:
16S rRNA metabarcodingGram staininghistological analysisimmunohistochemistryinfective endocarditistaxonomic diversity

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Area of Science:

  • Microbiology
  • Cardiovascular Pathology
  • Molecular Diagnostics

Background:

  • Infective endocarditis (IE) is a serious heart valve infection often leading to high mortality.
  • Accurate identification of causative pathogens is crucial for effective IE treatment and reduced mortality.
  • Current diagnostic methods may not detect all pathogens responsible for IE.

Purpose of the Study:

  • To investigate the bacterial diversity within heart valves affected by infective endocarditis.
  • To evaluate the utility of 16S rRNA metabarcoding as a diagnostic tool for IE.
  • To identify opportunistic microorganisms missed by conventional laboratory tests.

Main Methods:

  • Analysis of ten native heart valves from patients with IE undergoing valve replacement.
  • Histological examination using Gram staining and immunohistochemistry (CD45, CD41, myeloperoxidase).
  • Bacterial taxonomic diversity assessment via 16S rRNA gene metabarcoding.

Main Results:

  • Bacterial cells were observed on valve surfaces within fibrin deposits, often associated with microthrombi and neutrophils.
  • 16S rRNA metabarcoding identified a range of bacterial genera including *Pseudomonas*, *Roseateles*, *Acinetobacter*, and *Enterococcus*.
  • Several detected bacterial genera were not identified by routine laboratory methods.

Conclusions:

  • Opportunistic microorganisms, undetectable by routine tests, were found in IE-affected heart valves.
  • 16S rRNA metabarcoding is a valuable diagnostic method for IE, complementing standard laboratory approaches.
  • This molecular technique enhances pathogen identification, potentially improving therapeutic strategies for IE.