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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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Right and Left Atrial Dysfunction as Independent Cardiovascular Risk Factors: A UK Biobank Study.

Vidhushei Yogeswaran1,2, Jennifer A Brody1,3, Colleen M Sitlani1,3

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Summary
This summary is machine-generated.

Atrial cardiopathy, affecting both left and right atria, independently increases risks for atrial fibrillation (AF), stroke, and heart failure. Novel genetic links and causal effects highlight atrial structure’s role in cardiovascular disease.

Keywords:
atrial fibrillationatrial functioncardiovascular diseasesdeep learningheart atriaheart failure

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Area of Science:

  • Cardiology
  • Genetics
  • Biomarkers

Background:

  • Atrial cardiopathy is a known precursor to atrial fibrillation (AF) and a risk factor for cardiovascular events.
  • Previous research has been limited by sample size and has often excluded the right atrium.
  • Understanding biatrial structure and function is crucial for predicting cardiovascular outcomes.

Purpose of the Study:

  • To assess the association of left and right atrial structure and function with new-onset AF, ischemic stroke, heart failure, and dementia.
  • To identify novel genetic associations with atrial measures.
  • To investigate the causal relationships between atrial measures and cardiovascular outcomes using Mendelian randomization.

Main Methods:

  • Utilized cardiac magnetic resonance imaging and deep learning segmentation in 51,693 UK Biobank participants without prevalent AF.
  • Assessed biatrial volumes and emptying fraction.
  • Conducted genome-wide association study and Mendelian randomization analyses.

Main Results:

  • Both left and right atrial measures were independently associated with increased risk of new-onset AF, ischemic stroke, and heart failure.
  • Left atrial minimal volume was also associated with dementia risk.
  • Identified 51 genetic associations with atrial measures, including 27 novel loci, with distinct genetic correlations to cardiometabolic factors and cardiovascular phenotypes.

Conclusions:

  • This study, the largest to date on biatrial structure, confirms independent associations of left and right atrial cardiopathies with adverse cardiovascular events.
  • Novel genetic loci and unique correlations provide insights into chamber-specific remodeling and cardiovascular disease pathways.
  • Atrial measures may be causal determinants of cardiovascular complications previously attributed solely to AF.