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Related Concept Videos

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...
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...
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be met...
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...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

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Related Experiment Video

Updated: May 28, 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

Left ventricular function and exercise capacity in patients with slow coronary flow.

Islam A Elsherbiny1

  • 1Cardiology Department, Zagazig University, Egypt. islamcardio@yahoo.com

Echocardiography (Mount Kisco, N.Y.)
|November 3, 2011
PubMed
Summary

Slow coronary flow (SCF) impairs left ventricular (LV) function and exercise capacity. These findings highlight the need for close patient monitoring and risk stratification in SCF cases.

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Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
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Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Related Experiment Videos

Last Updated: May 28, 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

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Area of Science:

  • Cardiology
  • Echocardiography
  • Vascular Biology

Background:

  • Endothelial and microvascular dysfunction are linked to slow coronary flow (SCF).
  • The impact of these dysfunctions on left ventricular (LV) function and exercise capacity requires further investigation.

Purpose of the Study:

  • To evaluate LV systolic and diastolic function in SCF patients using pulsed tissue Doppler imaging (TDI).
  • To assess the effects of impaired LV function on exercise capacity in SCF patients.

Main Methods:

  • Sixty SCF patients and 20 controls underwent echocardiography, treadmill exercise tests, and TDI.
  • Key parameters measured included isovolumic myocardial acceleration (IVA) and myocardial performance index (MPI).

Main Results:

  • SCF patients exhibited significantly impaired LV systolic and diastolic function compared to controls, evidenced by decreased Sa, IVA, Ea/Aa, and increased MPI.
  • A significant correlation was found between thrombolysis in myocardial infarction (TIMI) frame count and LV systolic function parameters (Sa, IVA).
  • SCF patients demonstrated reduced peak exercise capacity, negatively correlated with TIMI frame count.

Conclusions:

  • Left ventricular systolic and diastolic function are impaired in SCF patients.
  • This impairment has a significant clinical impact on exercise capacity.
  • Close follow-up and risk stratification are crucial for managing SCF patients.