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相关概念视频

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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Sinusoidal Sources01:18

Sinusoidal Sources

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Direct current (DC) refers to an electric current that flows in a single direction, maintaining a constant polarity. This is in contrast to alternating current (AC), which periodically changes its direction and magnitude. AC forms the backbone of modern electricity transmission and distribution systems due to its efficient long-distance transmission capabilities.
In homes, the power supplies use sinusoidal sources to provide electricity. These sources generate a voltage that varies sinusoidally...
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Graphical and Analytic Representation of Sinusoids01:20

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Analyzing two sinusoidal voltages with equal amplitude and period but different phases on an oscilloscope, an instrument used to display and analyze waveforms, involves a three-step process.
The first step is measuring the peak-to-peak value, which is twice the amplitude of the sinusoid. This provides information about the maximum voltage swing of the waveform.
Secondly, the period and angular frequency are determined. The period is the time taken for one complete cycle of the waveform, while...
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Anatomy of Respiratory System I: Upper Respiratory Tract01:29

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The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
Nose and nasal cavity
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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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[沉默的鼻综合征]

Ben Gvili1, Arkadi Yakirevitch1

  • 1Department of Otolaryngology-Head and Neck Surgery, Sheba Medical Center, Ramat Gan, Israel, Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.

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|March 26, 2025
PubMed
概括
此摘要是机器生成的。

沉默鼻综合征 (SSS) 是一种罕见的疾病,导致突发鼻和轨道壁崩,通常是偶然发现的. 它的确切原因是有争议的,但来自骨封闭的负压力是主要理论.

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科学领域:

  • 耳鼻喉科 耳鼻喉科 耳鼻喉科
  • 眼科医生 眼科 眼科
  • 放射学 放射学是一门学科.

背景情况:

  • 沉默鼻综合征 (SSS) 是一种罕见的疾病,其特点是鼻壁和轨道底部的自发崩.
  • 它经常在成像研究 (CT / MRI) 中偶然诊断出与无关的疾病.
  • SSS的病因尚未完全理解,患者经常报告没有先前的鼻疾病或创伤.

研究的目的:

  • 审查当前对静音鼻综合征的理解.
  • 讨论SSS.的有争议的病因和临床表现.
  • 总结一下涉及负压和气体再吸收的拟议机制.

主要方法:

  • 现有关于静音鼻综合征的研究和病例报告的文献综述.
  • 分析假设的病因因素和临床表现.
  • 拟议的病理生理机制的综合.

主要成果:

  • SSS通常表现为无症状的眼膜和面部变化,尽管可能出现双眼视和鼻水等症状.
  • 领先的假设表明,负压,由于天然骨封闭后的气体再吸收,诱导了较低轨道壁的崩.
  • 这种情况经常在成像上偶然发现.

结论:

  • 沉默鼻综合征是一个独特的临床实体,有着争论的病因.
  • 气体再吸收的次要负压是轨道壁崩的最受欢迎的假设.
  • 需要进一步的研究来阐明SSS的精确机制和贡献因素.