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Related Concept Videos

Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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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...
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Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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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...
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Heart Failure Drugs: Inotropic Agents01:26

Heart Failure Drugs: Inotropic Agents

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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Heart Failure Drugs: Diuretics01:22

Heart Failure Drugs: Diuretics

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Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
312
Heart Failure Drugs: β-Blockers01:22

Heart Failure Drugs: β-Blockers

299
β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation,...
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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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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...
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Related Experiment Video

Updated: May 21, 2025

Biventricular Assessment of Cardiac Function and Pressure-Volume Loops by Closed-Chest Catheterization in Mice
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Biventricular Assessment of Cardiac Function and Pressure-Volume Loops by Closed-Chest Catheterization in Mice

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Viability and Congestive Heart Failure.

Mehmet Onur Omaygenc1, Lisa Marie Mielniczuk2

  • 1Department of Medicine (Cardiology), University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, Ontario K1Y 4W7, Canada.

Heart Failure Clinics
|March 19, 2025
PubMed
Summary
This summary is machine-generated.

Assessing myocardial viability helps manage ischemic cardiomyopathy by predicting recovery after revascularization. Advanced imaging techniques like cardiac MRI and PET are preferred for better patient outcomes.

Keywords:
Cardiac imaging techniquesLeft ventricular functionMyocardial hibernationMyocardial stunningVentricular remodeling

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Lumped-Parameter and Finite Element Modeling of Heart Failure with Preserved Ejection Fraction
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Last Updated: May 21, 2025

Biventricular Assessment of Cardiac Function and Pressure-Volume Loops by Closed-Chest Catheterization in Mice
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Author Spotlight: Unveiling Prognostic Indicators in Heart Failure - The Role of Phase Angle and Bioelectrical Impedance Analysis
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Area of Science:

  • Cardiology
  • Medical Imaging
  • Cardiovascular Disease

Background:

  • Ischemic cardiomyopathy management is complex, balancing procedure risks against treatment benefits.
  • Myocardial viability assessment offers crucial data for predicting functional recovery and prognosis after revascularization.
  • Evidence supporting viability assessment stems from posthoc analyses of clinical trials.

Purpose of the Study:

  • To highlight the importance of myocardial viability assessment in ischemic cardiomyopathy.
  • To discuss the role of viability assessment in guiding revascularization decisions.
  • To review current and emerging imaging modalities for myocardial viability.

Main Methods:

  • Review of clinical trial data and existing literature on myocardial viability assessment.
  • Comparison of different imaging modalities, emphasizing sensitivity and clinical utility.
  • Discussion of emerging technologies in cardiovascular imaging.

Main Results:

  • Myocardial viability assessment provides valuable prognostic information in ischemic cardiomyopathy.
  • Sensitive imaging techniques, including cardiac magnetic resonance and positron emission tomography (PET), are preferred.
  • Emerging tools show potential to enhance the diagnostic capabilities of current viability assessment methods.

Conclusions:

  • Myocardial viability assessment is essential for optimizing treatment strategies in ischemic cardiomyopathy.
  • Cardiac MRI and PET are currently the most effective non-invasive methods for viability assessment.
  • Continued development of imaging technologies will further improve patient care and outcomes.