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Related Concept Videos

Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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 Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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...
Myocarditis I: Introduction01:21

Myocarditis I: Introduction

Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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: Jun 14, 2026

Myocardial Infarction and Functional Outcome Assessment in Pigs
12:03

Myocardial Infarction and Functional Outcome Assessment in Pigs

Published on: April 25, 2014

Reversible microvascular dysfunction coupled with persistent myocardial dysfunction: implications for post-infarct

Leonarda Galiuto1, Francesca A Gabrielli, Antonella Lombardo

  • 1Institute of Cardiology, Catholic University of the Sacred Heart, Rome, Italy. lgaliuto@rm.unicatt.it

Heart (British Cardiac Society)
|September 19, 2006
PubMed
Summary
This summary is machine-generated.

Assessing microvascular dysfunction one week after myocardial infarction is crucial. Early improvement prevents left ventricular remodelling, making it a key predictor of cardiac outcomes.

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Permanent Ligation of the Left Anterior Descending Coronary Artery in Mice: A Model of Post-myocardial Infarction Remodelling and Heart Failure
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Post-Myocardial Infarction Heart Failure in Closed-chest Coronary Occlusion/Reperfusion Model in Göttingen Minipigs and Landrace Pigs
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Area of Science:

  • Cardiology
  • Cardiovascular Research
  • Echocardiography

Background:

  • Microvascular dysfunction following myocardial infarction is a dynamic process.
  • Understanding these changes is vital for predicting cardiac remodeling.

Purpose of the Study:

  • To assess the impact of dynamic microvascular dysfunction changes on left ventricular remodeling and contractile recovery.
  • To determine the optimal timing for evaluating microvascular dysfunction post-myocardial infarction.

Main Methods:

  • Myocardial contrast echocardiography (MCE) was used to study microvascular dysfunction in 39 myocardial infarction patients.
  • Assessments were conducted at 24 hours, 1 week, and 3 months post-percutaneous coronary intervention.

Main Results:

  • Microvascular dysfunction improved in patients without left ventricular remodelling, significantly differing from those with remodelling at 1 week and 3 months.
  • One-week microvascular dysfunction was the sole independent predictor of left ventricular remodelling (p<0.01).
  • A 1-week MCE cut-off value of 1.4 predicted left ventricular remodelling with 73% sensitivity and specificity.

Conclusions:

  • Early improvement in microvascular dysfunction post-myocardial infarction is beneficial for preventing left ventricular remodelling.
  • One-week microvascular dysfunction assessment is a powerful, independent predictor of left ventricular remodelling.