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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.
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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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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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Updated: Feb 15, 2026

Optogenetic Activation of Intrinsic Cardiac Autonomic Neurons in Excised Perfused Mouse Hearts
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Cardiac optogenetics: the next frontier.

Amit Gruber1, Oded Edri1, Lior Gepstein1,2

  • 1The Sohnis Family Reaserch Laboratory for Cardiac Electrophysiology and Regenerative Medicine, Rappaport Faculty of Medicine and Research Institute, Technion- Israel Institute of Technology, Haifa, Israel.

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|January 10, 2018
PubMed
Summary
This summary is machine-generated.

Optogenetics uses light and genetics to control heart cell activity. This technology shows promise for treating cardiac arrhythmias but faces significant challenges before clinical use.

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Area of Science:

  • Cardiovascular Science
  • Neuroscience
  • Biotechnology

Background:

  • Optogenetics, a technique combining optical and genetic methods, is revolutionizing neuroscience by enabling precise control over excitable cells.
  • This powerful technology is increasingly being explored for applications in cardiac electrophysiology.
  • Understanding the principles and tools of optogenetics is crucial for its advancement in cardiology.

Purpose of the Study:

  • To outline the fundamental principles and current tools of optogenetics relevant to cardiac applications.
  • To explore the potential of optogenetics for modulating cardiac electrophysiological properties.
  • To discuss the translational implications and challenges of optogenetic therapies for cardiac arrhythmias.

Main Methods:

  • Description of optogenetic principles, focusing on microbial opsins as light-gated ion channels and pumps.
  • Review of optogenetic tools for controlling membrane potential (depolarization/hyperpolarization) in cardiac tissues.
  • Analysis of experimental strategies for optogenetic-based cardiac pacing, resynchronization, and defibrillation.

Main Results:

  • Optogenetic actuators (microbial opsins) can effectively control cardiac tissue excitability through light-triggered ion channel activity.
  • Experimental strategies demonstrate the potential for optogenetic interventions in managing cardiac arrhythmias.
  • Significant obstacles and challenges remain for the clinical translation of these optogenetic approaches.

Conclusions:

  • Optogenetics offers a novel approach to modulate cardiac electrophysiology with potential therapeutic benefits for arrhythmias.
  • Further research and technological development are necessary to overcome current limitations for successful clinical application.
  • The future of optogenetics in cardiac medicine holds promise for innovative arrhythmia treatments.