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相关概念视频

Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Regulation of Pulse01:20

Regulation of Pulse

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Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Mechanism of Cardiac Arrhythmias01:28

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Pulse rhythm01:30

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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相关实验视频

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Using Wavelet Entropy to Demonstrate how Mindfulness Practice Increases Coordination between Irregular Cerebral and Cardiac Activities
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幅度转换条件透检测了在阴道抑制期间心脏周期变化的复杂性下降.

Alberto Porta, Paolo Castiglioni, Beatrice Cairo

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
    PubMed
    概括

    广度变换条件 (APCE) 可靠地评估心脏控制的复杂性,优于变换条件 (PCE),特别是低信号-噪声心脏周期动态.

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    Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach
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    科学领域:

    • 生理学 生理学 生理学
    • 生物医学工程 生物医学工程
    • 心血管研究研究心血管研究

    背景情况:

    • 评估心脏周期 (HP) 动态的复杂性对于理解心脏控制至关重要.
    • 传统的方法,如 permutation conditional entropy (PCE),可能会在低信号对噪声数据方面扎.

    研究的目的:

    • 在检测HP动态复杂度变化的过程中,比较振幅变量条件 (APCE) 与变量条件 (PCE) 的有效性.
    • 评估APCE在减少HP变异性条件下的可靠性,例如阴道阻塞.

    主要方法:

    • 在基线和氨酸诱导的阴道阻塞下,在健康受试者中分析了HP变异性.
    • 此外,HP数据也在头向上倾斜时收集,以模拟自主挑战.
    • 没有粗粒度的方法 (PCE,APCE) 和基于粗粒度的方法 (k-近邻条件,KNNCE) 计算了256个连续的HP值.

    主要成果:

    • 在服用阿特罗平时,PCE未能检测到减少的HP变异复杂性,而APCE和KNNCE则成功.
    • 所有方法都表明,在头向上倾斜时,HP复杂性减少.
    • 在这两种实验方案中,APCE与KNNCE有很强的相关性.

    结论:

    • APCE是比PCE更可靠的测量方法来评估心脏控制的复杂性,特别是当HP动态表现出低信号噪声比率时.
    • APCE的稳定性使其适合在各种生理条件下分析HP变异性,包括药理干预.