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Related Concept Videos

Coronary Artery Disease I: Introduction01:30

Coronary Artery Disease I: Introduction

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Coronary Artery Disease (CAD): An Overview with Scientific InsightsCoronary Artery Disease (CAD), often referred to as C-A-D, is a prevalent blood vessel disorder classified under the broader category of atherosclerosis. Atherosclerosis is a pathological process characterized by the hardening and narrowing of arteries due to the accumulation of atherosclerotic plaques. These plaques are composed of cholesterol, fatty substances, inflammatory cells, calcium, and fibrin, reducing blood flow to...
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Coronary Artery Disease II: Pathophysiology01:26

Coronary Artery Disease II: Pathophysiology

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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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Coronary Artery Disease III: Clinical Manifestations01:30

Coronary Artery Disease III: Clinical Manifestations

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Coronary Artery Disease (CAD) is a primary health risk worldwide, leading to significant morbidity and mortality. The condition arises from the buildup of atherosclerotic plaques within the coronary arteries, resulting in diminished blood supply to the heart muscle.The clinical manifestations of CAD vary widely, from asymptomatic stages to severe, life-threatening conditions. Understanding these manifestations is crucial for early diagnosis and effective management.Angina Pectoris: The Warning...
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Ischemic Heart Disease: Overview01:17

Ischemic Heart Disease: Overview

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Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
Atherosclerosis, the primary malefactor, orchestrates this dangerous condition. It manifests as the accumulation of fatty deposits, akin to insidious plaques, within arterial walls. As time elapses, these plaques metamorphose, hardening and...
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Coronary Circulation01:21

Coronary Circulation

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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
Coronary circulation begins at the base of the aorta, where two main arteries arise—the left and right coronary arteries. These arteries encircle the heart in the coronary sulcus and supply the...
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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Author Spotlight: A Pharmacodissection Approach to Uncover Mechanisms in Cardiovascular Disease Risk Populations
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Sex differences in contributors to coronary microvascular dysfunction.

Alan C Kwan1, Janet Wei1,2, David Ouyang1

  • 1Department of Cardiology, Smidt Heart Institute, Los Angeles, CA, United States.

Frontiers in Cardiovascular Medicine
|February 10, 2023
PubMed
Summary
This summary is machine-generated.

Sex differences in coronary microvascular dysfunction (CMD) are evident. Men with CMD show links to traditional risk factors, while women show links to cardiac structure, suggesting different disease pathways.

Keywords:
cardiac MRI (CMR)cardiac fibrosiscardiac remodelingcoronary microvascular dysfunction (CMD)myocardial perfusion reserve indexsex differences

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A Methodological Approach to Non-invasive Assessments of Vascular Function and Morphology
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Area of Science:

  • Cardiology
  • Cardiovascular Imaging
  • Medical Research

Background:

  • Coronary microvascular dysfunction (CMD) presents differently in women and men, but underlying causes of these sex differences are poorly understood.
  • Myocardial perfusion reserve index (MPRI), a measure from cardiac magnetic resonance (CMR) imaging, is a validated indicator of CMD.
  • Understanding sex-specific relationships between MPRI and cardiovascular disease markers is crucial.

Purpose of the Study:

  • To investigate sex differences in the associations between MPRI and traditional cardiovascular disease measures using CMR.
  • To explore how cardiovascular risk factors and cardiac structure/function markers relate to MPRI in a sex-stratified manner.

Main Methods:

  • Retrospective analysis of a single-center cohort (2015-2022) of patients undergoing stress CMR.
  • Inclusion criteria: calculable MPRI and absence of obstructive epicardial coronary artery disease.
  • Sex-stratified univariable and multivariable regression models were used to compare associations between MPRI and cardiovascular parameters.

Main Results:

  • The study included 229 patients (193 female, 36 male).
  • In women, no traditional cardiovascular risk factors were associated with MPRI. In men, diabetes and hyperlipidemia were linked to reduced MPRI.
  • Reduced MPRI in men correlated with increased ascending aortic diameter and T1 times. In women, reduced MPRI correlated with increased T1 times and LVMI.

Conclusions:

  • Findings indicate distinct pathophysiological mechanisms for CMD in men and women.
  • Lower MPRI in male patients aligns with a more traditional atherosclerotic profile.
  • Different CMR-derived markers are associated with MPRI in men versus women, highlighting sex-specific aspects of CMD.