Related Experiment Video

Updated: Jul 12, 2026

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
06:39

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice

Published on: April 13, 2015

Decreased aortic compliance aggravates subendocardial ischaemia in dogs with stenosed coronary artery

H Watanabe1, S Ohtsuka, M Kakihana

  • 1Department of Internal Medicine, University of Tsukuba, Ibaraki, Japan.

Cardiovascular Research
|December 1, 1992
PubMed

Insights

Decreased aortic compliance worsens outcomes in coronary artery disease patients, especially during increased heart workload. This study in dogs shows reduced oxygen in ischemic heart tissue when aortic compliance is low.

Area of Science:

  • Cardiovascular Physiology
  • Arteriosclerosis Research
  • Myocardial Ischemia

Background:

  • Arteriosclerosis commonly reduces aortic compliance in patients with coronary artery disease (CAD).
  • The impact of diminished aortic compliance on the compromised myocardium in CAD remains incompletely understood.

Purpose of the Study:

  • To investigate how reduced aortic compliance affects coronary artery disease.
  • To elucidate the physiological consequences of decreased aortic elasticity on myocardial oxygenation and function.

Main Methods:

  • A canine model with induced coronary artery stenosis was utilized.
  • Aortic compliance was experimentally reduced by thoracic aorta banding.
  • Hemodynamics, myocardial segment length, ECG, and tissue PO2 were measured under varying conditions.

Main Results:

  • Aortic banding increased pulse pressure but did not alter other hemodynamic variables.
  • During pacing, reduced aortic compliance led to lower subendocardial PO2 and higher subepicardial PO2.
  • ST elevation and reduced myocardial shortening were observed with aortic banding during pacing.

Conclusions:

  • Decreased aortic compliance exacerbates myocardial ischemia in the setting of coronary artery stenosis.
  • Increased cardiac workload, coupled with low aortic compliance, significantly compromises ischemic heart tissue.
Abstract

More Related Videos

Primary Outcome Assessment in a Pig Model of Acute Myocardial Infarction14:19

Primary Outcome Assessment in a Pig Model of Acute Myocardial Infarction

Published on: October 14, 2016

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Related Concept Videos

Ischemic Heart Disease: Overview01:17

Ischemic Heart Disease: Overview

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 narrowing...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
Aortic Regurgitation III: Medical Management01:25

Aortic Regurgitation III: Medical Management

Aortic regurgitation (AR) is when the aortic valve does not close or seal properly, leading to backward blood circulation from the aorta into the left ventricle during diastole. Common causes of AR include rheumatic heart disease, congenital valve defects, and aortic root dilation. Managing AR requires a multifaceted approach to alleviate symptoms, preserve left ventricular function, and address the underlying cause of the regurgitation. Patients with symptomatic AR or significant left...