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相关概念视频

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

891
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.
891
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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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

1.3K
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...
1.3K
Cardiac Action Potential01:30

Cardiac Action Potential

1.0K
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.
Ionic Basis of Cardiac Action Potentials
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

2.1K
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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Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

1.5K
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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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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患有反射同步症的患者的心脏几何和功能.

Giorgia Coseriu1,2, Patricia Schiop-Tentea1,2, Csilla-Andrea Apetrei1,2

  • 1Faculty of Medicine, University of Medicine and Pharmacy Iuliu Hatieganu, 400012 Cluj-Napoca, Romania.

Journal of clinical medicine
|November 27, 2024
PubMed
概括

反射同 (RS) 可能与特定的心脏特征有关. 较小的左心室和心房,以及正常或超收缩的心肌,可能会增加风险.

关键词:
左心室的尺寸和功能预测模型是一个预测模型.反射性失眠是一种反射性失眠.小的左心房是左心房.腹腔室理论是什么?

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Preclinical Cardiac Electrophysiology Assessment by Dual Voltage and Calcium Optical Mapping of Human Organotypic Cardiac Slices
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Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
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Preclinical Cardiac Electrophysiology Assessment by Dual Voltage and Calcium Optical Mapping of Human Organotypic Cardiac Slices
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科学领域:

  • 心脏病学 心脏病学
  • 神经科学是一个神经科学.
  • 人体生理学 人体生理学

背景情况:

  • 反射昏 (RS) 是昏的最常见原因.
  • 它的潜在病理生理学和临床表现仍然不完全理解.
  • "心室理论"是RS的主要假设,尽管有争议.

研究的目的:

  • 整合有关RS易感患者心脏形态和功能的数据.
  • 定义容易发生反射失眠的个体的表型.
  • 探索心脏结构在RS病理生理学中的作用.

主要方法:

  • 对RS中心脏形态和功能的现有研究进行审查.
  • 对将心脏参数与同步事件相关联的研究进行分析.
  • 在不同患者子集中整合发现.

主要成果:

  • 较小的左心室和心房尺寸与增加的协事件有关.
  • 一个正常或超收缩性心肌可能会使个体易患RS.
  • 这些心脏特征在各种患者群体中观察到,包括患有慢性疲劳综合征的患者.

结论:

  • 心脏几何和功能是理解RS不可或缺的组成部分.
  • 这些因素可能会影响治疗策略,如药物治疗,节律调节和心神经移除.
  • 心室尺寸和电激活模式可以预测昏迷的复发,帮助未来的预测模型.