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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...
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...
Heart Failure Drugs: Inotropic Agents01:26

Heart Failure Drugs: Inotropic Agents

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...
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...
Heart Failure I: Introduction01:27

Heart Failure I: Introduction

Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...
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: Jul 17, 2026

Myo-mechanical Analysis of Isolated Skeletal Muscle
08:42

Myo-mechanical Analysis of Isolated Skeletal Muscle

Published on: February 22, 2011

[Skeletal muscle efficiency in heart failure].

B Riescher1, J P Bourdarias, O Dubourg

  • 1Service de cardiologie, hôpital Ambroise-Paré, 9, avenue Charles-de-Gaulle, 92100 Boulogne, France.

Annales De Cardiologie Et D'Angeiologie
|September 17, 2004
PubMed
Summary

Heart failure patients show altered skeletal muscle but maintain normal mechanical efficiency during exercise. This suggests muscle efficiency is preserved despite cellular changes in chronic heart failure.

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In Vitro Assessment of Cardiac Function Using Skinned Cardiomyocytes
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In Vitro Assessment of Cardiac Function Using Skinned Cardiomyocytes

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Related Experiment Videos

Last Updated: Jul 17, 2026

Myo-mechanical Analysis of Isolated Skeletal Muscle
08:42

Myo-mechanical Analysis of Isolated Skeletal Muscle

Published on: February 22, 2011

Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy
09:04

Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy

Published on: February 20, 2018

In Vitro Assessment of Cardiac Function Using Skinned Cardiomyocytes
08:19

In Vitro Assessment of Cardiac Function Using Skinned Cardiomyocytes

Published on: June 22, 2020

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Skeletal Muscle Physiology

Context:

  • Heart failure (HF) is linked to skeletal muscle abnormalities, potentially causing exercise intolerance.
  • The mechanical efficiency of skeletal muscles in HF patients remains incompletely understood.
  • Assessing muscle efficiency is crucial for understanding exercise limitations in chronic heart failure (CHF).

Purpose:

  • To evaluate skeletal muscle mechanical efficiency in patients with chronic heart failure (CHF).
  • To compare oxygen consumption (VO2) and work output (Watt) relationships between CHF patients and healthy controls.

Summary:

  • Twenty CHF patients (peak VO2 17.6 ml/kg/min, LVEF <35%) and 11 controls (peak VO2 40.2 ml/kg/min) underwent prolonged cycling exercise at 35% and 65% of anaerobic threshold.
  • Oxygen consumption (VO2) was measured during constant load cycling, with VO2 from assisted cycling subtracted to determine the VO2-Watt relationship.
  • Ventilation was higher in CHF patients, but the VO2-Watt relationship was similar, indicating preserved skeletal muscle mechanical efficiency.

Impact:

  • Histological changes in CHF skeletal muscle do not impair mechanical efficiency.
  • Findings suggest that factors other than intrinsic muscle efficiency contribute to exercise limitation in heart failure.
  • This research provides insights into the physiological adaptations of skeletal muscle in chronic heart failure.