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相关概念视频

The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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The Electromagnetic Spectrum01:24

The Electromagnetic Spectrum

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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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Trial and Error and Algorithm01:12

Trial and Error and Algorithm

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A problem-solving strategy is a plan of action used to find a solution. Different strategies have distinct action plans. Trial and error involves trying different solutions until one works. For instance, to fix a broken printer, you might check ink levels, ensure the paper tray isn't jammed, and verify the printer's connection to your laptop. This method can be time-consuming but is commonly used. Thomas Edison, for example, used trial and error to find a suitable filament for the light...
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Mass Spectrum01:23

Mass Spectrum

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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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Relative Risk01:12

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Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
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相关实验视频

Updated: Jan 23, 2026

Ex Vivo Perfusion of the Rodent Placenta
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Ex Vivo Perfusion of the Rodent Placenta

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第一个三个月的风险分层算法为胎盘增殖谱的胎盘增殖谱.

Alesha White1, Jessica E Pruszynski2, Quyen N Do3

  • 1Department of Obstetrics & Gynecology, University of Texas Southwestern Medical Center, Dallas, TX; Parkland Health, Dallas, TX.

American journal of obstetrics & gynecology MFM
|January 21, 2026
PubMed
概括
此摘要是机器生成的。

一个新的第一季度超声波算法改善了在高风险怀孕中检测胎盘增殖谱 (PAS) 的性能. 这种工具比以前用于早期PAS诊断的方法具有更高的灵敏度和特异性.

关键词:
时间 时间 时间 时间 时间风险 PAS 风险 PAS 风险通过PAS风险分层分层.胎盘增殖的光谱第一个三个月的孕期.孕产妇发病率 孕产妇发病率

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Isolation and Analysis of Hematopoietic Stem Cells from the Placenta
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相关实验视频

Last Updated: Jan 23, 2026

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Construction of Vapor Chambers Used to Expose Mice to Alcohol During the Equivalent of all Three Trimesters of Human Development
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Isolation and Analysis of Hematopoietic Stem Cells from the Placenta
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科学领域:

  • 产科和妇科 产科和妇科
  • 孕产妇和胎儿医学 孕产妇和胎儿医学
  • 诊断成像 诊断成像 诊断成像

背景情况:

  • 胎盘积分谱 (PAS) 的产前诊断具有挑战性,由于晚期或错过的诊断,往往导致母亲的结果不理想.
  • 目前对PAS的风险分层协议缺乏标准化,特别是在第一季度超声波发现方面.
  • 早期识别PAS对于改善患者的治疗结果和计划分娩管理至关重要.

研究的目的:

  • 开发和评估一种新的风险分层算法,用于预测症状患者在怀孕第一季度的PAS.
  • 为了比较这种新算法的诊断性能与低植入率存在的剖腹产 (CD) 史.

主要方法:

  • 一项回顾性观察性研究分析了已知分娩结果的患者的第一季度超声波 (2021年1月至2024年2月).
  • 低植入被定义为在外骨5厘米以内的妊娠囊或热囊细胞变化.
  • 新的算法结合了妊娠囊位置,十足基底评估和最小肌体厚度 (SMT);它的性能与以前的CD的低植入相比较.

主要成果:

  • 新的算法在PAS检测方面表现出优异的性能,与以往CD的低植入相比.
  • 新算法的灵敏度,特异性和正预测值 (PPV) 分别为90%,99.6%和90%.
  • 对SMT测量的读者间一致性很大 (kappa=0.65),表明算法的可靠应用.

结论:

  • 开发的第一季度风险分层算法显示,PAS的敏感性,特异性和PPV显著改善,与之前CD的低植入相比.
  • 该算法表现出高度的读者间一致性,这表明其具有可靠临床使用的潜力.
  • 需要进行前性研究来验证这一有前途的风险分层工具,以早期检测PAS.