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相关概念视频

Pulse Oximetry01:24

Pulse Oximetry

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Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
323
Guidelines For Measuring Vital Signs01:19

Guidelines For Measuring Vital Signs

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Following these guidelines can help nurses accurately measure vital signs, assess changes in patient conditions, and provide timely treatment when necessary. Adhering closely to the guidelines ensures the accuracy and reliability of the results.
Before taking a patient's vital signs, a nurse would consider and assess the patient's comfort level and ensure appropriate equipment is available.
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Measurement of Blood Pressure01:17

Measurement of Blood Pressure

896
Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...
896
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

947
Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
947
Pulse01:05

Pulse

791
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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Respiratory Volumes01:15

Respiratory Volumes

1.4K
Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
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相关实验视频

Updated: Jun 14, 2025

Standardized Hemorrhagic Shock Induction Guided by Cerebral Oximetry and Extended Hemodynamic Monitoring in Pigs
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什么远程PPG氧度告诉我们关于脉动体积?

Gennadi Saiko1

  • 1Department of Physics, Toronto Metropolitan University, Toronto, ON M5B 2K3, Canada.

Biomedicines
|August 29, 2024
PubMed
概括

这项研究奠定了远程光聚素显微镜 (rPPG) 脉冲氧计的理论基础. 我们得出了比率的分析表达式,使得可以准确地测量组织氧化量,而不仅仅依赖实证数据.

关键词:
微循环是一种微循环.perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion perfusion 这是一个非常重要的方法,可以让你的身体和你的生活都变得更美好了,因为你的身体和你的生活都变得更美好了摄影复合体学 摄影复合体学 摄影复合体学脉冲氧计是指脉冲氧计的方法.

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Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
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相关实验视频

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Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
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科学领域:

  • 生物医学光学 生物医学光学
  • 生理测量生理测量
  • 光学工程是指光学工程.

背景情况:

  • 在健康监测中使用远程光斑血学 (rPPG),但缺乏既定的理论依据.
  • 目前的rPPG氧度依赖于经验方法,类似于传统脉冲氧度的比率计算.
  • 在rPPG中,比率的比率 (R) 和组织氧化率之间的分析关系还不清楚.

研究的目的:

  • 在rPPG的背景下建立脉冲氧计的理论基础.
  • 在rPPG氧度学中使用的比率 (R) 的分析表达式.
  • 研究R与动脉血和度 (SaO2) 之间的关系.

主要方法:

  • 在扩散近似中应用扰动方法,用于组织中的光传播.
  • 对于rPPG信号的AC/DC比率和比率比率 (R) 的导出明确表达式.
  • 模拟了R对SaO2 (70-100%) 的依赖,使用各种红/红外 (R/IR) 光源对.

主要成果:

  • 在rPPG.中获得了AC/DC比率和R的明确分析表达式.
  • 在多个R/IR波长中证明了R和SaO2 (R2=0.98-0.99) 之间的高度精确的线性关系.
  • 成功提取了有关脉动体积位置的信息,在额头rPPG数据中估计其深度为0.6毫米.

结论:

  • 该研究提供了rPPG比率的第一个分析推导,建立了理论基础.
  • 这些发现证实了rPPG信号参数与组织氧化之间的强烈,可预测的线性关系.
  • rPPG数据可以提供对微血管动态的见解,表明其起源于乳头皮肤/乳头下血管.