Related Experiment Video

Updated: Aug 16, 2026

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
11:50

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart

Published on: July 9, 2010

[Myocardial blood flow and changes in the electrocardiogram during veloergometry in patients with ischemic heart

V A Kuts', O I Moiseenko, A I Leshchenko

    Vrachebnoe Delo
    |February 1, 1989
    PubMed

    Insights

    Patients with ischemic heart disease experienced significantly reduced myocardial blood flow during physical exertion. This reduction correlated with abnormal heart electrical activity and decreased physical tolerance, indicating impaired heart function.

    Area of Science:

    • Cardiology
    • Physiology
    • Medical Imaging

    Context:

    • Investigating the physiological responses to physical exertion in patients with ischemic heart disease (IHD).
    • Assessing the relationship between myocardial blood flow, cardiac electrophysiology, and exercise tolerance.
    • Utilizing threshold load assessments to evaluate cardiovascular function.

    Purpose:

    • To determine the correlation between myocardial blood flow, depolarization and repolarization indices, and ST segment depression during threshold physical loads in IHD patients.
    • To quantify the reduction in myocardial blood flow in IHD patients with varying degrees of coronary artery stenosis.
    • To evaluate the impact of reduced myocardial blood flow on physical load tolerance.

    Summary:

    • A study involving 64 IHD patients and 14 controls examined myocardial blood flow during threshold physical loads.
    • Myocardial blood flow was reduced by 50% in IHD patients with two or three-vessel coronary artery disease.
    • Reduced blood flow was associated with altered depolarization and repolarization indices and ST segment depression, alongside low physical load tolerance.

    Impact:

    • Highlights the functional significance of coronary artery stenosis in IHD.
    • Provides insights into the electrophysiological changes accompanying reduced myocardial perfusion during stress.
    • Underscores the link between impaired myocardial blood flow and diminished exercise capacity in IHD patients.

    More Related Videos

    Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine12:37

    Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine

    Published on: February 9, 2016

    Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction08:35

    Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction

    Published on: August 17, 2022

    Related Concept Videos

    Pathophysiology of Cardiac Performance01:29

    Pathophysiology of Cardiac Performance

    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...
    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...
    Electrocardiogram01:29

    Electrocardiogram

    An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
    Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
    Correlation between ECG and Cardiac Cycle01:25

    Correlation between ECG and Cardiac Cycle

    The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
    A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
    Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

    Cardiac Output I:Effect of Heart Rate on Cardiac Output

    Cardiac Output
    Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
    Effect of Heart Rate on Cardiac Output
    Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
    Acute Coronary Syndrome III: Diagnostic Studies01:30

    Acute Coronary Syndrome III: Diagnostic Studies

    Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...