呼吸系统对改性复呼吸的反应不受过氧严重性的改变:对过氧过呼吸悖论的含义
Joshua D Huggard1, Nasimi A Guluzade1, James Duffin2,3,4
1School of Kinesiology, The University of Western Ontario, London, Ontario, Canada.
Journal of applied physiology (Bethesda, Md. : 1985)
|November 9, 2023
概括
诺莫巴克过氧症不会直接刺激呼吸或改变中央化学反应灵敏度. 这项研究发现,不同氧气压力不会改变呼吸系统对二氧化碳再呼吸的反应.
科学领域:
- 生理学 生理学 生理学
- 呼吸系统控制 呼吸系统控制
背景情况:
- 众所周知,Normobaric高氧会以时间和剂量依赖的方式刺激通风 (V·e).
- 确切的机制,无论是氧气 (O2) 特定的还是二次的二氧化碳 (CO2) 保留,仍然不清楚.
- 研究高氧化对呼吸道对二氧化碳反应的直接影响对于了解呼吸控制至关重要.
研究的目的:
- 为了确定呼吸机对高头的反应是否因不同程度的正常性高氧变化而改变.
- 测试假设V·e与终潮CO2 (Pco2) 关系是固定的,并且独立于氧气压力 (Po2).
主要方法:
- 20名参与者在4个随机的异氧-高氧条件下 (Po2: 150, 200, 300, 和 ≈700 mmHg) 进行了修改后再呼吸试验.
- 测量了每次呼吸的V·e,潮结束时的CO2和O2.
- 计算了呼吸道招募值 (VRT),基线V̇e (V̇eBSL) 和中央化学反应灵敏度 (V̇eS).
主要成果:
- 在不同高氧化条件下,没有观察到V̇eBSL,VRT或V̇eS的显著差异.
- 具体来说,V̇eBSL在6.57.5L·min-1之间,VRT始终在42mmHg左右,V̇eS在4.394.88L·min-1·mmHg-1.1之间.
- 这些发现表明,呼吸系统对二氧化碳的反应不受急性暴露于normobaric过氧的影响.
结论:
- 在广泛的normobaric氧气压力范围内,V·e-Pco2关系保持不变.
- 短时间暴露于normobaric过氧似乎没有独立刺激呼吸.
- 在人类中,Normobaric高氧症不会改变中央化学反射敏感性.
相关概念视频
01:30Alterations in Respiration II
876
There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
876
01:21Acute Respiratory Failure-II
249
Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
249
01:23Physiological Control of Respiration
2.1K
Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
2.1K
01:25Hyperpnea and Hyperventilation
1.1K
Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
1.1K
01:31Chemical Factors Affecting Respiration Centers
1.1K
Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated....
CO2 has a potent influence on respiration and is strictly regulated....
1.1K
01:30Acute Respiratory Failure-III
190
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
190