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相关概念视频

Regulation of Stroke Volume01:27

Regulation of Stroke Volume

3.2K
The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

807
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...
807
Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

2.9K
Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac...
2.9K

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相关实验视频

Updated: Jun 21, 2025

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
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Published on: December 9, 2015

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脑卒中发生的季节性变化

Vincent Brissette1, Moira K Kapral2,3, Bing Yu3

  • 1Division of Neurology, Department of Medicine, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.

Neuroepidemiology
|July 15, 2024
PubMed
概括

观察到中风发生率和病例死亡率的季节性变化,冬季死亡风险更高. 了解这些趋势可以帮助调整医疗保健资源以满足峰值需求.

关键词:
行政数据 管理数据季节性变化 季节性变化发生中风的情况.冲击子类型 冲击子类型

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Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum

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Last Updated: Jun 21, 2025

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科学领域:

  • 神经学 神经学
  • 公共卫生 公共卫生
  • 流行病学 流行病学

背景情况:

  • 脑卒中发生率和结果的季节性变化尚未完全理解.
  • 识别这些模式可以为资源分配和公共卫生战略提供信息.
  • 这项研究旨在调查中风发生率和死亡率的季节性趋势.

研究的目的:

  • 评估中风发生率及其亚型的季节性变化.
  • 评估中风患者30天病例死亡风险的季节性差异.

主要方法:

  • 使用加拿大行政卫生数据 (2003-2017) 的回顾性队列研究.
  • 根据季节对中风发生率的年龄/性别标准化率和调整率比率进行分析.
  • 考克斯比例危险模型用于评估季节对30天中风病例死亡率的影响.

主要成果:

  • 总共记录了394,145次中风或暂时性缺血性发作 (TIA) 事件.
  • 与夏季相比,在秋季和冬季中风发生率略低.
  • 冬季与30天中风病例死亡风险最高相关 (aHR 1.10).

结论:

  • 在中风发生率和病例死亡率方面存在显著的季节性变化.
  • 虽然绝对差异很小,但冬季的死亡风险更高.
  • 对影响中风风险的环境和气象因素的进一步研究是有必要的.