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相关概念视频

Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Physical Assessment of the Respiratory Tract II: Palpation01:24

Physical Assessment of the Respiratory Tract II: Palpation

Physical assessment of the respiratory tract is critical in identifying potential health issues. One key component of this assessment is palpation, a technique healthcare providers use to assess the body for abnormalities. This content explores the method of palpation in evaluating the respiratory tract, focusing on thoracic palpation and tactile fremitus.
Thoracic Palpation
Thoracic palpation detects tenderness, masses, lesions, respiratory excursions, and vocal fremitus. The nurse assesses...
Respiratory System Abnormal Finding II: Palpation and Auscultation01:31

Respiratory System Abnormal Finding II: Palpation and Auscultation

In assessing respiratory abnormalities, palpation and auscultation are critical tools for detecting and interpreting various pathophysiological changes. These techniques provide insight into underlying disorders by evaluating tactile sensations and sounds produced by the respiratory system.
Palpation Findings
During a respiratory assessment, palpation can reveal several vital abnormalities:

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相关实验视频

Updated: May 15, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
09:54

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宽带中耳肌反射幅度的规范范围:用于诊断耳脱差的有限潜力.

Naomi F Bramhall1,2, Garnett P McMillan1, Sean D Kampel1

  • 1VA Rehabilitation Research & Development, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR.

American journal of audiology
|February 24, 2026
PubMed
概括

这项研究的目的是建立宽带中耳肌肉反射 (MEMR) 的规范范围,以检测耳突触. 然而,开发的范围作为用于耳脱差的独立诊断工具是无效的.

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Data Acquisition and Analysis In Brainstem Evoked Response Audiometry In Mice
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相关实验视频

Last Updated: May 15, 2026

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科学领域:

  • 听觉神经科学 听觉神经科学
  • 耳声波排放 耳声波排放 耳声波排放
  • 听力学 听力学是指听力学.

背景情况:

  • 耳突触病,即内毛细胞和听觉神经纤维之间的突触损失,是一种与噪音暴露和衰老相关的常见听觉缺陷.
  • 目前缺乏用于耳突触和脱差的诊断方法.
  • 宽带中耳肌肉反射 (MEMR) 显示出诊断耳脱分的潜力,但需要规范性数据.

研究的目的:

  • 为了建立宽带MEMR大小的规范范围.
  • 为了识别异常弱的MEMRs患者.
  • 评估MEMR范围在诊断耳脱差时的有用性.

主要方法:

  • 在低风险人群中为ipsilateral和contralateral宽带MEMR大小生成了规范范围.
  • 经统计调整的MEMR范围,用于扭曲产品音声发射 (DPOAE) 水平.
  • 收集了来自军人退伍军人的测量数据,这些退伍军人存在高危的突触病.

主要成果:

  • 建立了规范范围,通过DPOAE水平考虑外皮毛细胞功能.
  • 很少有高风险个体低于已确定的MEMR规范范围.
  • 正如假设的那样,规范范围并没有有效地识别显著的耳脱差.

结论:

  • 仅仅宽带MEMR大小规范范围就不足以诊断耳脱差.
  • 需要进一步的研究来开发可靠的诊断工具用于耳突触.