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Infection01:20

Infection

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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
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Urinary Tract Infection II: Pathophysiology01:25

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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基础科学和病原发生学

Yasmine Coovadia1, Kathleen B Miller2, Nicole A Loggie1

  • 1University of Wisconsin-Madison, Madison, WI, USA.

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PubMed
概括
此摘要是机器生成的。

年长的女性显示血压调节和大脑血流之间的断开,不像年轻的个人和年长的男性. 这可能会增加老年妇女认知能力下降的风险.

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科学领域:

  • 神经科学是一个神经科学.
  • 心血管生理学心血管生理学
  • 老年学是一门学科.

背景情况:

  • 血压 (BP) 失调会影响大脑循环和阿尔茨海默病的风险.
  • 生物性别和衰老影响血压调节和脑血流 (CBF).
  • 女性表现出更大的与年龄相关的CBF下降和自主血压变化,可能增加阿尔茨海默氏症的风险.

研究的目的:

  • 研究衰老和生物性别对自主血压波动和CBF之间的关系的影响.
  • 为了测试老年女性与老年男性和年轻人相比,对同情性血压调节和CBF有损的假设.

主要方法:

  • 招募了健康的年轻人 (18-35岁) 和老年人 (55-69岁) 的男性和女性.
  • 使用微神经图测量了CBF的中脑动脉速度 (MCAv),BP的平均动脉压 (MAP) 和交感神经活动 (SNA).
  • 在SNA爆发后分析了BP和MCAv的节奏性波动.

主要成果:

  • 对SNA爆发的BP反应在老年人中减少,但在两性之间相似.
  • 对SNA爆发的CBF (MCAv) 反应在老年人中减少,在女性中低于男性.
  • 血压和CBF反应在年轻成年人和老年男性中是相关的,但在老年女性中没有.

结论:

  • 年长的女性表现出同情性BP调节和CBF波动之间的断开.
  • 这种脱节在年轻成年人或年长的男性中没有观察到.
  • 这种机制可能会导致老年女性认知障碍的风险增加.