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Related Concept Videos

Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

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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.
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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...
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The Cardiac Cycle01:13

The Cardiac Cycle

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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Cardiac Cycle01:29

Cardiac Cycle

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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
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Cardiac Action Potential01:30

Cardiac Action Potential

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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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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.
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Analysis of Cardiac Contractile Dysfunction and Ca2+ Transients in Rodent Myocytes
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JDP2 overexpression provokes cardiac dysfunction in mice.

Jacqueline Heger1, Julia Bornbaum1, Alona Würfel1

  • 1Institute of Physiology, Justus Liebig University, Giessen, Germany.

Scientific Reports
|May 18, 2018
PubMed
Summary

Jun dimerization protein 2 (JDP2) overexpression worsens heart failure in mice. This maladaptive response leads to cardiac dysfunction, hypertrophy, and fibrosis, highlighting JDP2

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Area of Science:

  • Cardiovascular Biology
  • Molecular Cardiology
  • Translational Medicine

Background:

  • Jun dimerization protein 2 (JDP2) is a prognostic marker for heart failure post-myocardial infarction.
  • The in vivo role of JDP2 in heart failure progression requires further investigation.

Purpose of the Study:

  • To elucidate the impact of JDP2 overexpression on cardiac function and heart failure development in a mouse model.

Main Methods:

  • Cardiac-specific JDP2 overexpression was induced in transgenic mice after a 4-week suppression period.
  • Cardiac function was assessed using echocardiography.
  • Molecular and histological analyses were performed to evaluate cardiac remodeling and fibrosis.

Main Results:

  • JDP2 overexpression rapidly impaired cardiac function and cardiomyocyte performance.
  • Significant reductions in blood pressure, ejection fraction, and cardiac output were observed.
  • Histological analysis revealed cardiac hypertrophy, fibrosis, increased extracellular matrix remodeling, and elevated matrix metalloproteinase 2 activity.

Conclusions:

  • JDP2 overexpression is detrimental to cardiac function in vivo, leading to maladaptive responses.
  • JDP2 induction contributes to cardiac dysfunction, hypertrophy, and fibrosis, promoting heart failure development.