Remodeling of left circumflex coronary arterial tree in pacing-induced heart failure
Yunlong Huo1, Ghassan S Kassab2
1Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, China; State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, China; College of Medicine, Hebei University, Baoding, China; and.
Insights
Congestive heart failure causes coronary vascular rarefaction, decreasing vessel numbers and diameters. This increases vascular resistance, compromising heart perfusion and worsening left ventricle function.
Area of Science:
- Cardiovascular Physiology
- Myocardial Remodeling
- Coronary Circulation Dynamics
Background:
- Congestive heart failure (CHF) disrupts the balance between myocardial supply and demand.
- While ventricular demand is understood, coronary arterial tree remodeling in CHF is not well-characterized.
Purpose of the Study:
- To investigate coronary arterial tree remodeling in a swine model of CHF.
- To determine if CHF-induced ventricular stress causes vascular rarefaction and increased resistance.
- To analyze the hemodynamic consequences of coronary structural changes in heart failure.
Main Methods:
- Morphometric analysis of the swine left circumflex (LCx) arterial tree in CHF and control groups.
- Computer reconstruction of the LCx arterial tree down to the capillary level.
- Hemodynamic analysis to assess vascular flow resistance and wall shear stress.
Main Results:
- CHF led to a significant decrease in vessel numbers (∼45%) and capillary diameters (∼10%) in the LCx arterial tree.
- Vascular flow resistance increased by approximately 75% in CHF animals.
- Structural remodeling altered wall shear stress throughout the LCx arterial tree.
Conclusions:
- CHF induces coronary vascular rarefaction, increasing vascular resistance and impairing myocardial perfusion.
- Understanding coronary arterial remodeling is crucial for comprehending the supply-demand imbalance in heart failure.
- This study provides insights into the structural adaptations of the coronary vasculature in response to heart failure.
Abstract:
Congestive heart failure (CHF) is a very serious heart disease that manifests an imbalance between left ventricle supply and demand. Although the mechanical demand of the failing heart has been well characterized, the systematic remodeling of the entire coronary arterial tree that constitutes the supply of the myocardium is lacking. We hypothesize that the well-known increase in ventricle wall stress during CHF causes coronary vascular rarefaction to increase the vascular flow resistance, which in turn compromises the perfusion of the heart. Morphometric (diameters, length, and numbers) data of the swine left circumflex (LCx) arterial tree were measured in both CHF (n = 6) and control (n = 6) groups, from which a computer reconstruction of the entire LCx tree was implemented down to the capillary level to enable a hemodynamic analysis of coronary circulation. The vascular flow resistance was increased by ∼75% due to a significant decrease of vessel numbers (∼45%) and diameters in the first capillary segments (∼10%) of the LCx arterial tree after 3-4 wk of pacing. The structural remodeling significantly changed the wall shear stress in vessel segments of the entire LCx arterial tree of CHF animals. This study enhances our knowledge of coronary arterial tree remodeling in heart failure, which provides a deeper understanding of the deterioration of supply-demand relation in left ventricle.
More Related Videos
09:37Permanent Ligation of the Left Anterior Descending Coronary Artery in Mice: A Model of Post-myocardial Infarction Remodelling and Heart Failure
Published on: December 2, 2014
10:39Rat Model of Right-Sided Cardiac Remodeling and Arrhythmia Using Pulmonary Artery Banding
Published on: August 30, 2024
Related Concept Videos
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
01:29Cardiomyopathy V: Interprofessional Care
01:30Cardiomyopathy II: Dilated Cardiomyopathy
01:29Heart Failure II: Pathophysiology
01:26Coronary Artery Disease II: Pathophysiology
01:21Coronary Circulation
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...