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相关概念视频

Hypoxia01:23

Hypoxia

2.0K
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
2.0K
Dynamic Equilibrium02:20

Dynamic Equilibrium

62.0K
A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
62.0K
Acute Pharyngitis01:30

Acute Pharyngitis

4.0K
Introduction
Acute pharyngitis is the inflammation of the back of the throat (pharynx), commonly resulting in a sore throat. It is a frequently encountered condition that prompts individuals to seek medical advice.
Classification
Acute pharyngitis can be categorized based on its underlying cause:
4.0K
Acute Pancreatitis I: Introduction01:27

Acute Pancreatitis I: Introduction

1.2K
Pancreatitis is inflammation of the pancreas, an organ located behind the stomach. It can be either acute or chronic.
Acute pancreatitis is characterized by rapid inflammation of the pancreas, often caused by factors like gallstone blockage or excessive alcohol consumption. Chronic pancreatitis, on the other hand, is a slow, progressive inflammation that may result from long-term alcohol abuse, obstructions in the pancreatic duct, or genetic factors.
The causes of acute pancreatitis include:
1.2K
Functional Groups02:45

Functional Groups

87.9K
Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, the presence of certain functional groups on a molecule will make them hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each...
87.9K
Acute Respiratory Failure-I01:21

Acute Respiratory Failure-I

907
Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
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相关实验视频

Updated: Jan 23, 2026

Induction of Hypoxia in Living Frog and Zebrafish Embryos
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Induction of Hypoxia in Living Frog and Zebrafish Embryos

Published on: June 26, 2017

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眼睛和视网膜功能的动态变化通过急性低性缺氧.

Xinli Yu1, Jiaxi Li2, Yuchen Wang2

  • 1School of Biological Science and Medical Engineering, Beihang University, Beijing, China.

Life sciences in space research
|January 21, 2026
PubMed
概括
此摘要是机器生成的。

高海拔低氧影响视网膜功能,特别是视网膜内层,与眼内压力有关. 这项研究探讨了它与太空飞行视觉障碍的相关性.

关键词:
急性缺氧是什么意思?急性缺氧是什么意思?在 ERG ERG 里面,有很多东西可以做.眼球眼球眼球眼球眼球视网膜功能 视网膜功能

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An Acute Retinal Model for Evaluating Blood Retinal Barrier Breach and Potential Drugs for Treatment
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An Acute Retinal Model for Evaluating Blood Retinal Barrier Breach and Potential Drugs for Treatment

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Glutamate and Hypoxia as a Stress Model for the Isolated Perfused Vertebrate Retina
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Glutamate and Hypoxia as a Stress Model for the Isolated Perfused Vertebrate Retina

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相关实验视频

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Induction of Hypoxia in Living Frog and Zebrafish Embryos
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Induction of Hypoxia in Living Frog and Zebrafish Embryos

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An Acute Retinal Model for Evaluating Blood Retinal Barrier Breach and Potential Drugs for Treatment
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Glutamate and Hypoxia as a Stress Model for the Isolated Perfused Vertebrate Retina
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Glutamate and Hypoxia as a Stress Model for the Isolated Perfused Vertebrate Retina

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科学领域:

  • 太空医学 太空医学
  • 环境生理学环境生理学
  • 眼科医生 眼科 眼科

背景情况:

  • 视力障碍和内压力 (VIIP) 综合征是长期太空飞行中的重大风险.
  • 了解VIP机制至关重要,而陆地高空缺氧作为一个相关的类比.
  • 急性山病 (AMS) 与太空飞行引起的神经变化有生理上的相似之处.

研究的目的:

  • 为了研究急性低氧暴露在不同高度对眼睛参数的影响.
  • 探索眼内压力,折射状态和视网膜功能在缺氧下之间的关系.
  • 评估非侵入性眼睛测量作为低氧相关风险的生物标志物的潜力.

主要方法:

  • 39名健康参与者在海平面和3500米,4000米和4500米的高度进行了评估.
  • 测量包括折射 (球体,圆柱体),眼内压力 (IOP) 和电网膜学 (ERG).
  • 使用统计分析,包括回归来确定变量之间的关联.

主要成果:

  • 低氧暴露显示了微妙的,不显著的折射和IOP的变化.
  • 电网膜学揭示了振幅降低和延迟增加,特别是闪b波振幅显著下降,表明视网膜内部的敏感性.
  • 在IOP和闪b波振幅 (β = -0.307,p = 0.031) 之间发现了显著的负相关性.

结论:

  • 急性缺氧影响视网膜功能和眼睛光学,反映了VIP综合征和AMS的方面.
  • 内视网膜层对缺氧条件非常敏感.
  • 像折射和ERG这样的非侵入性眼睛测量表明,在太空飞行和高海拔环境中,低氧相关的视觉和神经风险的生物标志物具有前途.