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Related Concept Videos

Atherosclerosis I: Introduction01:30

Atherosclerosis I: Introduction

Atherosclerosis is a progressive disorder characterized by the buildup of plaques on the arterial inner wall, causing them to narrow and harden over time. These plaques comprise lipids, calcium, blood components, carbohydrates, and fibrous tissue. The process primarily affects the intima of large and medium-sized arteries, reducing blood flow in any artery.Etiology and risk factorsThe cause of atherosclerosis is multifactorial, involving a complex interplay among endothelial injury, lipid...
Atherosclerosis II: Clinical Manifestations and Diagnostic Tests01:27

Atherosclerosis II: Clinical Manifestations and Diagnostic Tests

Atherosclerosis is a progressive disorder that leads to the thickening and narrowing of arterial walls due to plaque buildup. This condition can cause various symptoms depending on the arteries affected:Coronary Artery Disease (CAD): This condition affects the coronary arteries and may lead to chest pain (angina), shortness of breath (dyspnea), heart attacks, and other heart disease symptoms.Cerebrovascular Disease: This affects blood flow to the brain, causing transient ischemic attacks (TIAs)...
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
Coronary Artery Disease II: Pathophysiology01:26

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Coronary Artery Disease (CAD) originates from a series of events that impair the function of coronary arteries, the blood vessels responsible for delivering oxygen-rich blood to the heart muscle. The pathophysiology of CAD is closely linked to atherosclerosis, a chronic inflammatory and lipid-driven condition affecting the vascular endothelium.1. Endothelial DamageThe process begins with damage to the vascular endothelium, which serves as a protective barrier between the blood and the vessel...

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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
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Atherosclerotic plaque characterization by spatial and temporal speckle pattern analysis.

Guillermo J Tearney, Brett E Bouma

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    A new method uses speckle pattern analysis to differentiate vulnerable atherosclerotic plaques from stable ones. This technique could improve the identification of plaques causing heart attacks.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Research
    • Medical Imaging

    Background:

    • Acute myocardial infarction and sudden cardiac death are often caused by vulnerable atherosclerotic plaques.
    • Current methods for identifying vulnerable plaques are insufficient.
    • There is a need for advanced techniques to characterize plaque structure and biomechanics.

    Purpose of the Study:

    • To develop and validate a novel method for characterizing atherosclerotic plaques.
    • To distinguish between vulnerable and stable atherosclerotic plaques using speckle pattern analysis.
    • To explore the potential of this method in identifying plaques responsible for cardiovascular events.

    Main Methods:

    • Acquisition of near-field speckle images from human aortic specimens ex vivo.
    • Analysis of temporal and spatial speckle pattern fluctuations.
    • Measurement of speckle decorrelation time constant (tau) for different plaque types.

    Main Results:

    • Speckle decorrelation time constant (tau) significantly differed between plaque types.
    • Vulnerable plaques showed a tau of 40 ms.
    • Stable plaques exhibited a tau of 400 ms, and normal aorta had a tau of 500 ms.

    Conclusions:

    • Analysis of speckle pattern fluctuations can distinguish between different types of atherosclerotic plaques.
    • This method shows promise for identifying vulnerable plaques.
    • Further research may lead to improved diagnostic tools for cardiovascular disease.